Falcon RIP ??? I think so :(

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BoNuS
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Falcon RIP ??? I think so :(

Postby BoNuS » Wed Mar 25, 2009 4:35 pm

I think I have a sad announcement to make but it seems that another Atari Falcon joined silicon heaven :(
Yesterday I got a old TV from someone with a scart connection, just the thing I was looking for.
So I connected my Falcon to it, and it worked fine. But when I inserted a floppy the screen
started flickering. I thought an lose connection so I checked al the cables.
Al seemed okay and when I started typing again there it was again and then it stopped completly.

Image

This was the image i got after a restart, not very hopefull is it. So I took of the top to
check what was wrong. I couldn't see anything really wrong apart from the steel casing
was hitten the top of the memory expansion board (the installer never removed the steel
above it or put anything between it) so the connections probably short fused ?!?!?!
But it still works...

Anyway, it seems that this Falcon is passed it or does some one has a good suggestion ????

I put the memory expansion in my other Falcon and it still works fine, so ????
I also switched the TOS chip (4.02 to an 4.04) and that also works fine...

I also found another piece of hardware which wasn't in my old Falcon. To be honest I don't have
a clou of what it is (it has an Intel chip on it). An pc expansion ???
Image
Image
Image

Anybody an idea of what this is ???
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Re: Falcon RIP ??? I think so :(

Postby DarkLord » Wed Mar 25, 2009 6:26 pm

Looks like one of those PC 286 emulators maybe?

Also, since you have a Falcon with a known good working P/S, swap it out just to
make sure its not that.

Make sure that add on card is seated correctly too.

HTHs.
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Re: Falcon RIP ??? I think so :(

Postby BoNuS » Wed Mar 25, 2009 6:46 pm

@Darklord

Yess I did that swap (swapped al good stuff like newer TOS, Mem, HD and the ??? card)
But since I don't know what it is, i don't know how to address/use it.

A few minuts later...

I never thought about looking up the code on the chip :)
Harris CS80C286-16 is indeed an 286 core at 16 Mhz hahaha

Now I know what it is, now how to use it ....
Last edited by BoNuS on Wed Mar 25, 2009 6:51 pm, edited 1 time in total.
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Re: Falcon RIP ??? I think so :(

Postby Mark_G » Wed Mar 25, 2009 6:48 pm

The add-on card is Falcon speed http://vic20.de/html/body_atari_st.html. A 286 card for the falcon. You can now use Wordperfect, ms-dos, and perhaps MSwin3.11.

If you remove the card, you need to place a jumper, on one of the expansion ports. It's indicated in the following foto.
Did you try to connect it to a monitor?

I think it's the first step you need to check. I've a falcon who works only with a b/w sm124 monitor. Some line select is broken.

Mark
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Re: Falcon RIP ??? I think so :(

Postby BoNuS » Wed Mar 25, 2009 6:55 pm

Wow, windows 3.11, gues that it's not Vista approved then.

Yes I noticed that too because I had a Falcon without the expansion and saw the jumper.
So I swap these things out to check it...
Already tried that, unfortunaly without succes :(

It seems to do less and less, now there isn't even an blocked picture anymore.
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Re: Falcon RIP ??? I think so :(

Postby MRAtari » Wed Mar 25, 2009 8:22 pm

that always was something i really didn't like about the falcon, the memory board so close to the metal shield, usually there was a piece of card between them

but people adding upgrades, third party manufactures never had theat essential piece of card!

years ago i saw one where someone had pressed the keys too hard and pushed the metal case onto the back of the memory board and...... black screen no floppy light!

it blew a chip and more

your screen looks like one i've seen on a STFM or STE

a possible memory problem, if you have another memory card try it

good luck

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Re: Falcon RIP ??? I think so :(

Postby BoNuS » Wed Mar 25, 2009 9:10 pm

MRAtari wrote:that always was something i really didn't like about the falcon, the memory board so close to the metal shield, usually there was a piece of card between them

but people adding upgrades, third party manufactures never had theat essential piece of card!

years ago i saw one where someone had pressed the keys too hard and pushed the metal case onto the back of the memory board and...... black screen no floppy light!

it blew a chip and more

your screen looks like one i've seen on a STFM or STE

a possible memory problem, if you have another memory card try it

good luck


Thats what happend, the metal shielding was pressed against the soldering side of the memory expension. Esp. the part
with the 3 flappy metal strips. One of then was stuck between 2 pins even. But strangly eneough the mem expansion
still works in my other Falcon. I tested the "defect" Falcon with 2 other memory board (I had 2 x 4 Mb boards left) but no
luck there either.

The metal shielding from my other falcon has now been "updated" to prefend it from happening again.
See pictures for the diffenrence, for show the old 4mb module is still in it :)
Image Image
Last edited by BoNuS on Wed Mar 25, 2009 9:26 pm, edited 1 time in total.
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Re: Falcon RIP ??? I think so :(

Postby DarkLord » Wed Mar 25, 2009 9:19 pm

BoNuS wrote:@Darklord
Yess I did that swap (swapped al good stuff like newer TOS, Mem, HD and the ??? card)
But since I don't know what it is, i don't know how to address/use it.


Okay, so you did swap the power supply out too.

Hmm, guess others will have to take a stab at it then.

Sorry I couldn't be of more help.
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Re: Falcon RIP ??? I think so :(

Postby BoNuS » Wed Mar 25, 2009 9:28 pm

DarkLord wrote:
BoNuS wrote:@Darklord
Yess I did that swap (swapped al good stuff like newer TOS, Mem, HD and the ??? card)
But since I don't know what it is, i don't know how to address/use it.


Okay, so you did swap the power supply out too.

Hmm, guess others will have to take a stab at it then.

Sorry I couldn't be of more help.


Hey I happy will all the help sofar :) Didn't swap the power supply, I can hear the fan working though.
But maybe one of the lines is just out. Might still try that one, thx !
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Re: Falcon RIP ??? I think so :(

Postby MRAtari » Thu Mar 26, 2009 10:13 am

does the floppy light come on? and search for a disk

simbo

Re: Falcon RIP ??? I think so :(

Postby simbo » Sat Mar 28, 2009 12:25 pm

i thought deeply about this problem and i recon
as the metal case shorted out to the memory board
and as the board still works aok in other machine's
therefore it must be U42 U43 circuit says 74LS244 you should use 74HC244 youll find these in RS
but it must be there soic version if your not sure take one out and take it with you
or find someone to replace them for you
{page 5 falcon circuit youll find online {comes as falcon 1 2 and 3 folders}and 5.pcx is in falcon1 folder }


these chips allow selection of the memory bank in use
and there output gates connect upto the memory
given the short, and the memory still works...
however it still looks onscreen as memory errors
its logical to assume one or more is gubbed
its worth replacing them with new ones before sending the machine to die
its quite easy to change these two smd chips

if either of these chips fail youl get a similar pattern on the display as the memory isnt there
as selected the tos wont load either...

you can also see them in the top left of the picture mark kindly posted

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Re: Falcon RIP ??? I think so :(

Postby nativ » Sat Mar 28, 2009 1:19 pm

I second the idea of a memory problem.

It appears to have powered up and displayed an image.
Do you have a Falcon wing or a Simm expansion board ( If so get some SIMM's from somewhere!) or an original Atari memory board? Someone might have a test board for you to use???

Regards

Ashley
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Re: Falcon RIP ??? I think so :(

Postby simbo » Sat Mar 28, 2009 1:23 pm

read all the posts again ashley as youll see the memory its self has been qualified on another falcon

as i say u42 u43 is the route to take now.... after this

the mmu....

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Re: Falcon RIP ??? I think so :(

Postby nativ » Sat Mar 28, 2009 1:28 pm

I've only had a few minutes to flick through!!!

Good luck with fixing it...........

Cheers

Ashley
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Re: Falcon RIP ??? I think so :(

Postby simbo » Sat Mar 28, 2009 4:23 pm

im sure that it cant die i wont let it for one...!

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Re: Falcon RIP ??? I think so :(

Postby BoNuS » Sun Mar 29, 2009 10:43 am

First of all thx for all the response !!! I am a bit short of time at the moment due work, but I will
try all the given options out !!! I already removed the PSU and will try another...

Then I will check Simbo's solutions, althought I have to read his text a few times I believe :)
to fully understand ! I will keep you all informed about my findings/ progress.

(after few hours)

Okay checked the power suppluy, seems to work okay. Good voltage
on the 12 an 5 volt lines.

I also located the 2 chips Simbo talk about...
Image

I doubt if I can do that, its rather small soldering...
I have done some of soldering but this :( It's so small
I would make it probably one big blob :)
And were to get these chips and how much are they anyway ?
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Re: Falcon RIP ??? I think so :(

Postby karlm » Mon Mar 30, 2009 2:59 am

Mark_G wrote:I think it's the first step you need to check. I've a falcon who works only with a b/w sm124 monitor. Some line select is broken.
Mark


Hi Mark

I think that this was a problem with incorrect NVRAM settings on mine at some stage as well, and I had to go in and blow away the NVRAM settings, using a mono monitor. Very weird, I thought TV would work but no. So you might like to try that as well. iirc my clock chip was stuffed (non-functional) so I replaced that at the same time (this is where the NVRAM is anyway)
It may work for you, it might not.

Cheers

karlm.

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Re: Falcon RIP ??? I think so :(

Postby stimpy » Tue Mar 31, 2009 8:46 pm

simbo wrote:therefore it must be U42 U43 circuit says 74LS244 you should use 74HC244 youll find these in RS

these chips allow selection of the memory bank in use
and there output gates connect upto the memory


Nope, they are used by TOS to determine what ram card is fitted. For starters, the input of the gates go to the memory card so those gates should be fine. Some of the design of the Falcon is a bit wacky, but routing 'memory bank' selection signals all the way across the board and back again would be silly.
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Re: Falcon RIP ??? I think so :(

Postby Mark_G » Tue Mar 31, 2009 9:07 pm

Hello,

Checked doitF030 :
Dunkler Bildschirm
Keine Versorgungsspannung. Check PSU, (Check LED), Defekter COMBO IC
Defekter VIDEL IC
Testmodul erforderlich.


Weißer Bildschirm
VIDEL IC, COMBO IC, SDMA IC oder MC 68030.
Test nur mit Diagnosemodul über RS232 möglich
und dem seriellen Kabel möglich


Punkte auf dem Bildschirm
Defekte Speicherkarte, COMBO IC, VIDEL IC.
Test mit Diagnosemodul oder Ram-Testprogramm.
Speicherkarte testweise wechseln


Striche auf dem Bildschirm
Defekte Speicherkarte, COMPBO IC, VIDEL IC.
Test mit Diagnosemodul oder Ram-Testprogramm.
Speicherkarte testweise wechseln


Eine Farbe fehlt
Testen Sie ihr Videokabel und die Stecker.
SGC DAC, VIDEL IC. Signaltest nur korrekt mit Oszilloskop möglich.


Monochrome Monitor
Überprüfen ob bei eingesteckten Monochromen Monitor auch
der Detect Pin gegen GND gelegt wird. MFP GPIT Bit 7
MFP auswechseln.


Wilder Bildschirm (nur Color)
COMBO IC, Test nur mit Diagnosemodul möglich.

TV-Modulator
Modulator defekt. Signal fehlt. Phase locked loop.
Signale testen mit Oszilloskop.


Info Combo chip :

3.17 COMBO Chip


Der COMBEL (COMBO) CHIP im Falcon

Der COMBO ist ein speziell für den FalconF03 hergestellter Multifunktionsbaustein mit folgenden Funktionen:

- Memory Contol Unit [MCU]
- Interrupt Priority and Illegal Condition Detection
- Clock Dividers / Taktteiler
- Chip Selekt Handling
- Paddleport Controller
- Joystick Controller
- Light Gun Controller
- Blitter (Grafischer Coprozessor im Falcon)


Die MCU im COMBO nimmt die Adressen vom Adressbus (A1-A23) und wandelt diese in Reihen und Spalten für das DRAM. Ebenso erzeugt die MCU die RAS- und CAS-Signale für den Betrieb des Ramspeichers.

Ebenso werden hier die Chipselektsignale für das ROM und die I/O-Bausteine generiert. Die MCU im COMBO kann im FalconF030 bis zu 14MB Ram verwalten und Adressieren. Sie ist auch der Grund für brachliegende 2 MB Speicher die im Falcon nicht mal als Ramdisk angesprochen werden können.

Die größe des Ramspeichers beschränkt sich im Falcon auf genau zwei Ausbaustufen. Es gibt eine 4MB und eine 14MB (16MB) Ramkarte die auf den internen Erweiterungsplatz gesteckt werden können. Hierzu existieren genau zwei Selektionspins die über einen weiteren Hardwarebaustein der MCU welche menge von RAM zur verfügung steht. Die MCU produziert ebenfalls sämtliche Adressen für den Videospeicher, den Refresh und den CPU/DMA Datentransfer über den Multiplex-Adressbus des Falcon.

Sämtliche Systeminterrupts werden im COMBO maskiert. Ebenso wird der Status aller Interrups im COMBO gespeichert. Beachten Sie die Auflistung der Systeminterrupts und deren Priorität.

Interrupt Level Priorität
----------------------------------------------
7 (highest) Open (Bus)
6 MFP / DSP Interrupt
5 85C30 LAN Baustein
4 VSYNC (Vertikal Blank)
3 Open (Bus)
2 HSYNC (Horizontal Blank)
1 (lowest) Open (Bus)


Die Hardware im COMBEL erlaubt es die Interruptlevels 1-3 als Interrupts von externen Devices zu behandeln. So sind einige Subsysteme in wie z.B der IDE oder der Parallelport in der Lage dieser Interrupts zu aktivieren. Weitere Hardware nutzt den Interruptlevel 5. Der COMBO Chip meldet der CPU über die Leitungen IPLO-IPL2 mit welcher Priorität der gerade aufgetretene Interrupt anliegt.

Interrupt Signal Definiton

IPL2 IPL1 IPL0 Interrupt Level
----------------------------------------------
1 1 1 Level 1
1 0 1 Level 2
1 0 0 Level 3
0 1 1 Level 4
0 1 0 Level 5
0 0 1 Level 6
0 0 0 Level 7


Weiterhin ist der COMBEL in der Lage Bus Errors und Fehlfunktionen festzustellen.

Nach folgenden Kriterien sendet der COMBEL ein BERR-Signal zur CPU:

- Ein Buszyklus ist nicht in 16 Microsekunden beendet (Änderbar auf 32uS)!!
- Ein Versuch das ROM zu beschreiben
- Ein Versuch Daten mit falscher Länge, Format in ein Register zu schreiben
- Beschreiben des Systemspeichers im Usermode

Taktteiler

Das COMBO IC wandelt die Ursprünglichen 32Mhz Mastertakt in 16Mhz, 8Mhz sowie in ein 4 Mhz und in ein 500Khz Taktsignal um.

Chipselekt

Der COMBEL dekodiert die Adressen und selektiert daraus die Chipselektsignale für weitere Peripheriebausteine des FalconF030.
Das Betrifft folgende Chips:

8650, MFP, VIDEL , RTCCS (RealTimeClock), MMU , Romport, (XROM3/XROM4)
IDE (HIDECS0/HIDECS1) sowie ROM / ROM2

Im COMBO werden ebenfalls die Signale PAD0X, PAD1X und PAD0Y, PAD1Y sowie PADRST verarbeitet. Alle diese Signale stammen vom Paddleport den es bisher auch nur am Falcon gibt.
PADRST dient als Resetsignal für den Paddleport.
Ebenso befindet sich im innern des COMBO die Logik um ein paar Joysticks am Falcon betreiben zu können. Hierzu liegen am COMBEL die Inputsignale JOYRH, JOYRL an. Beide Signale sind ReadEnable-Signale. JOYWH und JOYWL sind WriteEnable-Signale. BUTTON ist die Signalleitung für die Feuertasten

Der im COMBO integrierte BLITTER ist der grafische Coprozessor wie er auch schon in anderen Atari-Computern eingebaut war. Im Falcon wurde der Blitter aber eben in den COMBEL integriert. Der Blitter lässt sich im Falcon mit einem Softwarebefehl deaktivieren. In anderen Systemen musste hier ein Jumper oder eine Lötbrücke gesetzt werden. Der Blitter sollte Bitblock-Operationen beschleunigen und die CPU unterstützen/entlasten. Die Pinbelegung des COMBO Chip entnehmen Sie bitte dem Kapitel Pin aus DOITF030.

Letztlich bleibt noch das Signal XPEN welches den COMBO veranlasst die Daten vom Horizontal-/ Vertikalzähler einzulesen. Diese Daten werden erreicht in dem die korrekte Position der "Lightgun" anhand des Bildschirm-Lichtrasters von der CPU errechnet wird.

Bleibt als Abschluß noch zu sagen das Sie sich bemühen sollten den COMBEL in ihrem Falcon pfleglich zu Behandeln. Anhand dieser Erläuterungen können Sie sehen das ohne diesen Chip ihr Falcon nicht mal eine Diskette einlesen wird. Sie werden ohne den COMBEL nicht mal eine einfache Bildschirmausgabe sehen können.


I'm not a hardware guru, so my knowledge ends here. If you have the equipment to check the combo, and videl chip, I think you need to check those IC.
Concerning my falcon, I first checked the nv-ram.

Mark

simbo

Re: Falcon RIP ??? I think so :(

Postby simbo » Wed Apr 22, 2009 5:00 am

stimpy wrote:
simbo wrote:therefore it must be U42 U43 circuit says 74LS244 you should use 74HC244 youll find these in RS

these chips allow selection of the memory bank in use
and there output gates connect upto the memory


Nope, they are used by TOS to determine what ram card is fitted. For starters, the input of the gates go to the memory card so those gates should be fine. Some of the design of the Falcon is a bit wacky, but routing 'memory bank' selection signals all the way across the board and back again would be silly.


looking at the schematics again i see U42 is the only one that could cause an issue with ram

looking at the picture above is it just me or do i see a massive crack over the chips top
im sure closely looking at the poor picture its not a bad accept of the picture
but a damaged chip

if your saying tos only 'scans' the banks avalible then the senario is
that tos 'thinks' it is using a different ram size type and trys to use ram outside its range
hence the bus hangs and only videl inits to display squares
whats needed to be known is exactly what it does as a short film on utube using a web cam or something
of bootup and a warm reset and attempts at a keyboard warm reset etc to further guage whats going on
maybe a sharper picture of the sick machines U42

to replace these type of ic use a magnifying glass if needed and get a pal to help
simply use a pair of sharp micro side cutters to cut the pins £4 in RS
then desolder whats left of the pins as the chip will come off easy its not glued downetc..
using a 17watt or less antex pencil point soldering iron
clean the area then position and solder the four corner pins of the new one
then both rows doing diagonal pins side to side to minimise heating the chip

simbo

Re: Falcon RIP ??? I think so :(

Postby simbo » Wed Apr 22, 2009 5:24 am

karlm wrote:
Mark_G wrote:I think it's the first step you need to check. I've a falcon who works only with a b/w sm124 monitor. Some line select is broken.
Mark


Hi Mark

I think that this was a problem with incorrect NVRAM settings on mine at some stage as well, and I had to go in and blow away the NVRAM settings, using a mono monitor. Very weird, I thought TV would work but no. So you might like to try that as well. iirc my clock chip was stuffed (non-functional) so I replaced that at the same time (this is where the NVRAM is anyway)
It may work for you, it might not.

Cheers

karlm.



karlms prob right
however i would also check U42 and its pullup resistors

U42 does fail
especialy if there is video port abuse/ comprimise as its directly connected to the outside world via the video socket

i think so far ive replaced this ic in gubbed machines about 10 times
so it does fail and usualy becouse of a screwed up bridge rectifier in the ataris psu or the monitor has an earthing issue
or your home does ,....!!!!

senario is that if your home has a bad earth and the monitor gives flashover inside of the eht used to drive the tube
[
this earthing issue is a complex one its caused by people using phase inverters to rewind there older meters
and they tend to rot the earthing at the local distribution transformers etc causeing local earthings and
cables to gain potential
electricity companies are only legaly obliged to provide live and neutral and not earth
so earthing your home is a good idea
cleaning out the monitor case and discharging and silicon greesing the eht cap on the tube inside your sparking monitor is a VERY !!! good idea to do as it will minimise possible damage to the ataris and also to the monitors EHT production LOP transformer
]
then this 20-40KV is dumped into the connection between the computer and the monitor
it flashed over inside the socket
and wipes out U42

when this happens internal circuits to this ic fail and it knocks out the memory monitor types selection etc
sometimes it works only then with one type of monitor and only some types of ram
banking errors can be then present making the machine only appear to work with certain ram modules other issues ive seen before is a massive hole where the chip used to be becouse its gone short and on fire
!!!
mostly a good test is the back of the first finger
fold your finger sit it on top is it hot or more than room temp after 5 mins on then replace it
or if its hotter than the other one there is also a good test

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Re: Falcon RIP ??? I think so :(

Postby BoNuS » Sun May 03, 2009 8:04 pm

For anyone that is following this topic :)
My Falcon will travel to Scotland and Simbo will have a look.
He made all the smart remarks and since I don't have the tools to
do it myself I hope he can bring it back to live...

-UPDATE-

I send it last tuesday and I heard from Simbo that it was already in at thursday.
That fast, but then again it costs me 25 euro just to send it. Still if it works
again then it worth a lot more but most of all a Falcon has been saved.
It like an rare beast, kind of endangered species :wink: So like the whales and pandas
it just has to be saved :lol:

Keeping my fingers crossed... Will keep you posted.
Last edited by BoNuS on Fri May 08, 2009 2:25 pm, edited 3 times in total.
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REPAIR PROGRESS REPORT FAULTY FALCON 030 :coffe:

Postby simbo » Fri May 08, 2009 11:59 am

REPAIR PROGRESS REPORT FAULTY FALCON 030
----------------------------------------------

MACHINE
========

THIS FALCON IS VERY CLEAN AND TIDY "!VERY" AND A PLEASURE TO WORK ON AND IS PLAIN VANILA
4MB RAM NO FPU NO HDD
VIDEO IS RGB OR MONO TV SIGNAL SHOWS NOTHING

SYMPTOMS
------------
1: NO VIDEO {VGA, {HIGH RES{SM124+CORRECT ADAPTER CABLE}}} NO TV FROM MODULATOR
2: NO FLOPPY
3: NO TOS OR CHECKING LEDS


SO FAR CHECKED
=============
1: POWER RAILS TO ALL IC'S AND SUB PSU REGULATION
2: ALL CLOCKS WORK
3: HEAT FROM CHIPSET ONLY MPU U55 U13 U38{IDE} AND U28 GET WARM
THE MPU REACHED 32DEG IN 37 SECONDS FROM 20 DEG ROOM TEMP
U28 REACHES 37 DEG IN 1MIN 34SEC ALL OTHER IC'S REMAIN ~25DEG AFTER 10 MINS AND THE COMBEL IS DEAD COLD
THE IDE CONTROLLER IN MY OWN FALCON GETS AS WARM AS DOES U13
4: DATA PASSED AT POWER ON AND RESET BY r8006 SIGNAL FROM THE COMBEL TO LOAD U42 DATA TO THE DATA BUS
5: VIDEL INTERACTS WITH THE RAM AND STATIC DATA CAN BE SEEN AS CAS RAS ARE STROBING
6: MPU INITS BUT NO ADDRESS OR DATA STOBES AT THE MPU PINS 125 & 124
7: DTACK TOGGLES AT BOOT BUT REMAINS STATIC ON A RESET
8: DATA BUS IS NULL AFTER AN INITIAL WORD TRANSFER OF ALL 1 SO I BELEVE THERE IS NO DATA TO THE BUS FROM THE VIDEL
9: ALL !RESETS AND !HALT ARE AOK...
10:HSYNC VSYNC AOK... TO VIDEL ALSO r/w SIGNAL IS AT VIDEL INPUT CS IS TOGGLED AT COLD BOOT ONLY AND NOT AT RESET OR IN ITS USUAL SERVICE HENCE THE COLD VIDEO OUTPUT....
11: ALL IC'S CS SIGNALS ARE TOGGLED ONCE AT COLD POWER AND NOT AT WARM RESET
12: MPU r/w PIN IS TOGGLED AT COLD BOOT BUT NOT AT WARM RESET
13: DSACK0,1 TOGGLES HIGH LOW AT COLD POWER AS DOES IPL 1,2 HOWEVER IPL0 REMAINS LOW. COLD OR WARM BOOT
14: XBGK ON MPU TOGGLES ON COLD BOOT AS DOES SIZ0,1 AND FC0,1,2
I SEE THEY ARE FRAMED
SO THE SYSTEM IS PRODUCING THESE SIGNALS AOK...

CONCLUSSIONS SO FAR
===================
THE VIDEL AND COMBEL BOTH SERVICE THE RAM
HOWEVER A STATIC ADDRESS IS PRESENTED BY THE COMBEL
AND THE DATA BUS IS NEVER LOADED WITH THIS dWORD OR ANYTHING PAST A COLD BOOT 0 THEN ALL 1 THEN ALL 0
AS NO ADDRESS AND DATA BUS STROBES ARE RUNNING I ASSUME THIS TO BE THE CASE
THE r/w PIN ON THE MPU NEVER GETS TOGGLED PASSED COLD BOOT ONCE {AS ITS SET STATE }SO THE COMBEL IS MOSTLY LIKE THE RIGHT IC TO REPLACE
THERE IS A LITTLE VOICE IN MY HEAD TO REPLACE THE MPU68030 FIRST
AS IT HOTTER THAN NORMAL
TAKING MY OWN FALCON AND STOPPING CLOCKS TO THE COMBEL OR THE MPU CREATED THE EXACT ISSUE
SO I THINK ITS A TOSS UP BETWEEN THE MPU AND COMBEL
AND AS THE MEMORY ADDRESSING IS DONE BY THE COMBEL
PERHAPS IT HAS GONE WRONG
ILL MAKE A LOGIC MAP OF EVENTS TIMES AFTER BOOT USING MY SCOPE PER UNIT PINS

I THINK THE VIDEL IS AOK AS IT SEEMS TO BE SERVICING THE RAM WITH DATA FROM THE COMBEL
HOWEVER THE DATA IS ALWAYS THE SAME BYTES ILL READ THIS WORD LATER SEE WHAT IT IS
THE MACHINE SEEMS TO BE STUCK AND THE MPU ISNT STROBING AS OR DS
SO PERHAPS ITS GUBBED
ANY INPUT FROM OTHERS IS A GOOD IDEA
I PLUMP FOR THE MPU AS ITS EASY TO REPLACE FIRST
AFTER A FEW MORE CHECKS ILL KNOW
ANYONE WITH A DUD FALCON PCB ILL BUY IT FOR SURE.,..

I NOTICE A COUPLE OF TEST PINS ON THE COMBEL AND VIDEL
IM GONA DROP OUT THE PCB AND PULL THE VIDEL AND COMBEL TEST LINES HIGH
AND SEE IF THE USUAL PICTURE IS DISPLAYED

AND IM GOING TO DISABLE THE MPU CLOCK AND SEE IF IT STILL GETS HOT

AND ALSO THE ORIGINAL PROBLEM WAS THE METAL SCREEN TOUCHING PINS ON THE RAM
HOWEVER THE COBEL IS BUFFERED TO THESE PINS VIA 33R RESISTORS BUT I SUPPOSE 33OHMS
ISNT MUCH TO A 5V SWITCHING I/O
AND AS THE RAM DATA PINS BEING SHORTED TO GROUND WOULD KILL THE DRAM BOARD
THEN THE ADDRESS LINES TO THE RAM GROUNDED COULD KILL THE COMBEL
ILL SAY THE COMBEL IS GUBBED

ILL CHECK THRU ITS ADDRESS LINES AND SEE IF THEY ALL REPORT A COLD BOOT AND RESETING WAVEFORM

SEE IF A SINGLE GATE IS GONE

simbo

Re: Falcon RIP ??? I think so :(

Postby simbo » Sun May 10, 2009 8:50 am

ok .... well after much thought and testing
its the combel ic thats gubbed

it draws ~NO current{283uamps} at all from vcc so its gubbed for sure

new one cost's $45 from best
so i recon this will work out around 60 uk after tax postage etc etc from the U.S
ill send them an email and request a quote ....

so next thing is to fire up the smd plant and take the gubbed one off


for anyone interested i have prepaired a set of gif images
from the pcx files of the falcon 030 schematics
they are far better quality as i converted them all to grayscale
and i printed on a laser printer they are not perfect but a whole lot better for sure

here is the link {2.8mb}
http://uk.geocities.com/mayaka2001/falc ... ematic.zip

simbo

Re: Falcon RIP ??? I think so :(

Postby simbo » Wed May 13, 2009 11:34 pm

after a rerun now ive collected more measurements of exactly whats up with this machine
im going to change the mpu first
as its very warm even with the clock disabled to it and draws 780ma !!!
also the address bus outputs from it
0000 0000 0000 0000 0000 0011
all address lines toggle high then low on a reset press except a1 and a2 they remain at +5v
there is no AS {address strobe output}
no Dtack toggles
reset halts are both toggled at boot
no other signals are generated by it 8/16mhz clock is present....
even read write is dead it does recieve FC 2 3 on boot but not 1 it remains low {looking this is right}
Berr remains low there is no data strobe DS from the mpu
i made this choice becouse when i measure the R8006 signal at the combel its there
also the cas ras etc all show waveforms as its servicing the ram so is the videl
althought the top 16bits of dram data arent serviced and again remian low
im begining to think that the mpu has failed more and more as its needed to service the upper half of the ram
where the combel does this with the videl all the time to the lower 16bits

and so i ordered one just incase and ill fit it first {a bit easier than the combel }
it makes sense now ....

maybe the expanssion board has become loose when the machine was on
or its self has a fault
and im going to recomend its checked before plugging it back in
as its the only 'variable' that would kill the mpu stone dead
any memory shorting issue would be absorbed by current limit in the videl or combel dma chain
the dma remains cold and its service pins are never toggled so the floppy never gets quized or rom 2 3 4 arent toggled
so the mpu is dead


another simple falcon fault
and not for once the combel


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