Search found 634 matches

by Arne
Sat Jul 25, 2020 4:06 pm
Forum: Professionals
Topic: Early TT motherboard CPU socket question
Replies: 4
Views: 207

Re: Early TT motherboard CPU socket question

IIRC Atari wanted to release the TT with a 16MHz CPU but when Commodore announced the Amiga 3000 with 25MHz 68030 the Atari engineers had to upgrade their design (for marketing reasons).
by Arne
Tue Jul 21, 2020 7:08 pm
Forum: Hardware
Topic: atari st diagnostics cart error
Replies: 10
Views: 299

Re: atari st diagnostics cart error

He said it was a 520 STfm in OP. MB model and rev has nothing to do with memory size. Am I missing something? No, you are right. I just missed the OP's statement in the first post. I will try to get my head around the 244/373 but at the moment I'm not sure I understand the schematic for this If you...
by Arne
Tue Jul 21, 2020 3:26 pm
Forum: Hardware
Topic: atari st diagnostics cart error
Replies: 10
Views: 299

Re: atari st diagnostics cart error

Hi. It's a C070789-001 Rev C So it is a 1040STFM. At the memorybus D3 and D5 has a problem. May be D3 has a short to GND D5 - I think I understand, but why D3? We wrote a one to D3 and got a one back? Or am I interpreting the serial port diagnostics stuff wrong? No. You are right - he is wrong. D5 ...
by Arne
Mon Jul 20, 2020 6:57 am
Forum: Hardware
Topic: Atari st serial is giberish
Replies: 2
Views: 165

Re: Atari st serial is giberish

Very detailed error report! 8O We don't know what Atari ST you are talking about! You may short-circuit the RX and TX pins on the RS232 connector and use no-handshake option in your terminal PRG (i.e. no XON/XOFF or RTS/CTS). Then it should return what is being sent. This rules out cable and PuTTy s...
by Arne
Sun Jul 12, 2020 7:39 pm
Forum: C / PASCAL etc.
Topic: PureC's PRJ files on command line
Replies: 2
Views: 139

Re: PureC's PRJ files on command line

Are you looking for something like this: https://atari-forum.com/viewtopic.php?f=16&t=37579 (ThorstenOtto's post)?
by Arne
Fri Jul 10, 2020 1:00 pm
Forum: Hardware
Topic: 11 bombs after TOS 1.04 upgrade
Replies: 13
Views: 375

Re: 11 bombs after TOS 1.04 upgrade

Did you burn the EPROMs yourself? If so then check if the contents matches the sticker. I would remove 1.04 and use 1.00 again and see if it boots correctly. Edit: you may check the PCB yourself here: https://www.exxoshost.co.uk/forum/viewforum.php?f=52 There is only a Rev.D/D1 but it should help as...
by Arne
Fri Jul 10, 2020 11:42 am
Forum: Hardware
Topic: 11 bombs after TOS 1.04 upgrade
Replies: 13
Views: 375

Re: 11 bombs after TOS 1.04 upgrade

6 chips originally, 6 chips in upgrade So you swapped 6 ROMs for 6 EPROMs. Are you sure that you did not swap a LO-1 for HI-1 EPROM (any combo of LO/HI 1/2 comes in mind) as the machine boots correctly (it seems) from EPROMs in sockets labeled LO-0 and HI-0. 11 Bombs is a Line-F trap - I am no expe...
by Arne
Fri Jul 10, 2020 5:39 am
Forum: Hardware
Topic: 11 bombs after TOS 1.04 upgrade
Replies: 13
Views: 375

Re: 11 bombs after TOS 1.04 upgrade

Very detailed error report!
We don't know:
  • what machine (ST(FM))
  • PCB revision
  • was it a 2 or 6 ROM config before
  • is it a 2 or 6 (EP)ROM update now
by Arne
Sat Jun 27, 2020 9:14 am
Forum: Coding
Topic: ACSPro example program under version 3.0.0
Replies: 52
Views: 1482

Re: ACSPro example program under version 3.0.0

Thats great news guys! (Am I the only end user here? lol) I once looked into different options for creating a GEM application and considered ACSPro, too. I even got the original box with manual and disks but couldn't figure out how to implement some details in GEM (Radiobuttons IIRC) - and it wasn'...
by Arne
Sun May 10, 2020 9:16 am
Forum: Professionals
Topic: TT FAQ: "Wait states off MCU msb (7) never set" diagnostics message => Harmless
Replies: 11
Views: 523

Re: TT FAQ: "Wait states off MCU msb (7) never set" diagnostics message => Harmless

maybe there is possibility to remove completely waitstates like on f030, that would be cool. But probably faster rom would be needed. Why not copy ROM to TT-RAM using ROMSpeed? https://seimet.de/atari/en/index.html Cheaper than buying new ROMs and faster anyway. The MCU has a SEL pin (described as ...
by Arne
Sun May 10, 2020 8:17 am
Forum: Professionals
Topic: TT FAQ: "Wait states off MCU msb (7) never set" diagnostics message => Harmless
Replies: 11
Views: 523

Re: TT FAQ: "Wait states off MCU msb (7) never set" diagnostics message => Harmless

As you are talking about the (ST-RAM) MCU: as soon as you populate an add-on ST-RAM board you've got two MCUs in your TT.
Does it mean one is partly deactivated? Otherwise you would have two sets of registers at the same addresses. 8O
by Arne
Sun May 03, 2020 4:22 pm
Forum: C / PASCAL etc.
Topic: Software reset in C
Replies: 16
Views: 823

Re: Software reset in C

(...), of course, such a situation should never occur. ;) And of course I have heard that argument way too often to believe it anymore. :lol: Why not simply use Pterm() instead? If I had an application that rebooted my system without a warning, I'd be pretty upset. Indeed and indeed. But maybe he i...
by Arne
Sat May 02, 2020 8:45 pm
Forum: C / PASCAL etc.
Topic: Software reset in C
Replies: 16
Views: 823

Re: Software reset in C

mikro wrote:Out of curiosity, what kind of fatal error is this supposed to handle?
Ever heard of the HCF mnemonic?
https://en.wikipedia.org/wiki/Halt_and_ ... computing)
:mrgreen:
by Arne
Sun Apr 26, 2020 10:32 am
Forum: For sale / Wanted
Topic: Wanted: DELA Epromdisk firmware and software
Replies: 2
Views: 262

Re: Wanted: DELA Epromdisk firmware and software

Check this:
Dela EpromDisk.zip
by Arne
Thu Apr 16, 2020 1:14 pm
Forum: Coding
Topic: Coding the clean way: calling Xbios in VBL subroutine for sound mixing
Replies: 14
Views: 1095

Re: Coding the clean way: calling Xbios in VBL subroutine for sound mixing

I don't know if it is eligible to call TOS from an INT but at least BIOS/XBIOS will trash some registers: Function results are returned in the processor register d0. Only registers d3-d7 and a3-a7 are saved, all others may be altered by the call. http://toshyp.atari.org/en/004001.html Might this app...
by Arne
Tue Mar 31, 2020 4:01 pm
Forum: Hardware
Topic: Installing the PAK68/3
Replies: 141
Views: 23130

Re: Installing the PAK68/3

TheNameOfTheGame wrote:Anyone have one of these "buffer boards΅ it mentions?
Yes
by Arne
Tue Mar 31, 2020 9:12 am
Forum: Hardware
Topic: ATARI 520 STF RAM : mix of 100ns and 120ns ?
Replies: 4
Views: 464

Re: ATARI 520 STF RAM : mix of 100ns and 120ns ?

In general it is no problem mixing DRAMs with different access times. A buddy once witnessed an upgraded Mega ST (2MB -> 4MB) not booting where each bank had a large discrepancy in access time to the other (70ns to 120/150ns IIRC). We could not figure out why. Populated both banks with 70ns and it b...
by Arne
Fri Mar 27, 2020 7:47 pm
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

I swapped the 7606 between FDC and FDD these days - bad idea. The 74F04 I used seems to have problems pulling the level to high on the DIRC pin. https://i.ibb.co/Hzq10Qs/DS1-Z-Quick-Print4.gif So I swapped it back to the 7606 re-soldered all pins around the FDC and now it can read my disks. Many tha...
by Arne
Fri Mar 27, 2020 12:40 pm
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

I checked FDD and flat-ribbon cable on another Mega. But you may remember what I wrote in the beginning about different FDDs giving different results (write-protect error...).
by Arne
Fri Mar 27, 2020 12:20 pm
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

Update: pushed on the DMA IC and rebooted. It booted to Desktop without icons. Attached FDD and now it takes an awful amount of time till desktop appears with icons for A:, B: and Trash bin. But it cannot read any disk and any disk is displayed with 0 bytes of capacity. So at this point it behaves l...
by Arne
Fri Mar 27, 2020 12:08 pm
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

I'm glad I wrote that code yesterday evening. What I did: switch off ST insert my diag cart and deactivate it (i.e. it's got a jumper routing /CS to the EPROM/Flash - if not a pull-up takes over) switch on ST till 2 bombs are displayed activate cart press reset button Reset is a Group 0 exception bu...
by Arne
Fri Mar 27, 2020 11:31 am
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

(..) A16, maybe you could (re-)check that address line. Splendid Just as I touched the 0-Ohms resistor's leg at the center of W3 (pin 2) with my measuring lead it gave way i.e. it had broken off at some point near the solder joint. Replaced it with some wire. Now I get 2 bombs - once it made it up ...
by Arne
Fri Mar 27, 2020 11:26 am
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

Just hooked up the scope to the 3 inputs/1 output of the 74LS11. https://i.ibb.co/S5LhmZS/DS1-Z-Quick-Print1.gif I triggered on all 3 inputs and the corresponding output was always asserted as it should. Think this rules out the LS11 as a source of problems. Your hint with a cracked resistor network...
by Arne
Fri Mar 27, 2020 10:36 am
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

Well, at least I now know that my dump-code doesn't dump crap :D And your assumptions are supported by the diag cart's CRC calculations. I assume that necessary connections between CPU and Glue are fine - at least those that are needed for /ROMx signals. Glue and CPU are fine, too. But as I wrote ea...
by Arne
Fri Mar 27, 2020 8:37 am
Forum: Hardware
Topic: MegaST2 with constant resets
Replies: 46
Views: 2567

Re: MegaST2 with constant resets

I wrote a little "diag cart software" that dumps the CPU Save State Area in a loop via MFP UART (as this one was known to be working with the Atari diag cart software). This is the dump: CPU Save State Area =================== 00000380 : 12345678 00000384 : 00FD0000 00000388 : FFFF0000 0000038C : 00...

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