Search found 141 matches

by avtandil
Sat Nov 20, 2010 12:00 am
Forum: Website Discussions
Topic: Missing TOS ROMs?
Replies: 79
Views: 70271

Re: Missing TOS ROMs?

Dear Atarians ! Recently I found some small bugs in Russian TOS, so now all of them are fixed, you can download corrected version here - http://avtandil.narod.ru/tos/tos206ru.zip Also FIY I burned this TOS on chips and inserted to my Atari STE, and it works now ! Please find attached picture. Best r...
by avtandil
Wed Nov 10, 2010 11:43 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

simbo wrote:yippeeeee!

someone with a scope!!!!

excelent!!! :cheers:

It was Tnt23 !!!
by avtandil
Wed Nov 10, 2010 8:45 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

Dear All !

Proud to inform that my friend with Oscilloscope was able to fix my STE !!!

Problem found:

Shortage on CS-pin of MFP.
MFP soldered again and now the computer works fine !

Thanks to all involved !
by avtandil
Mon Nov 08, 2010 9:31 am
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

Dear Simbo !

Could you give a bit more detailed instruction - how can we check clock, DMA and others - where to measure by oscilloscope and what we should get if ic works ?

PS Interesting thing - when I put new RAM - 4 Mb - right floppy lamp start to shine, but system is still not loading
by avtandil
Wed Nov 03, 2010 10:49 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

found one friend in my city with STE. Visited him today to test some elements. Unlucky he has another revision, so only RAM and TOS chips were able to test - working OK, while his TOS inserted in my STE didn;t solve the problem. Going to visit another man having oscilloscope. Simbo, could you please...
by avtandil
Sun Oct 31, 2010 11:07 am
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

Seems that U210 is OK.

Pins 1 & 3 have low, while pins 2 & 4 are high.
If I hold pressed reset button 1 & 3 have high, and 2 & 4 have low.
As I understood it is like should be.

Next steps, please ?
by avtandil
Sat Oct 30, 2010 1:02 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

do it in stages then check pin's 2 , 4 of the ic in a white circle its U210 i think it should be a 74LS06 ic marked on top there are a few revisions of the ste one has an ic mounted piggy back u400 if its there its marked on the board as U210 on my own ste its a piggy back type however u210 is next...
by avtandil
Fri Oct 29, 2010 10:53 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

simbo wrote:ok ok

i remember now

u210

now so have you checked out whats going on in the circuit diagram and
you see how to test the pins just using a simple multimeter dvm

I was out for couple of days, tomorrow will try to test reset line.
Any additional instructions ?
by avtandil
Wed Oct 27, 2010 12:03 am
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

avtandil what electrical test equipment do you have access to? :?: In order of preference the following is useful for fault finding digital circuits: * Oscilloscope :idea: - My friend have the one, but it will be a big story to deliver STE to him, as he don't like to borrow... * Logic Probe :idea: ...
by avtandil
Tue Oct 26, 2010 8:44 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

Dal_1978 wrote:OK - just didn't want you to start chasing signals round your board only to find out your monitor or RGB cable was knackered! :D
No, amigo, monitor works well with my old STFM ;-)
by avtandil
Tue Oct 26, 2010 3:22 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

Dal_1978 wrote:You really ought to rule out your monitor. Plug your ST into a TV using the TV out on the back just next to the monitor port. Tune into ch36-ish and see if you get anything...

System is not starting, of course there is nothing on TV-output also...
by avtandil
Sun Oct 24, 2010 7:57 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

simbo wrote:some pictures please....

of test setup

you should have atari with floppy and keyboard connected

and ram in the correct slots


lets see some pic's

Please...

Waiting for further instructions :D

BTW Sound looks OK - I hear a click when power on.
by avtandil
Sun Oct 24, 2010 11:06 am
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

simbo wrote:sorry guys i have a bad russian gripe {flu} and cant speek or most see the type

ill be back in a couple of days or so

:|
Wishing you to recover soonest !!!
by avtandil
Sat Oct 23, 2010 9:21 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

Strange thing - my PM to Simbo is still in Outbox folder for the second day. Simbo, did you get it ?

In short - I tested to remove and put back all ic you advised - no result.

I need a bit more explanation - what points can I test with multimeter and how to do this .
by avtandil
Thu Oct 21, 2010 3:44 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

simbo wrote:yes i beleve its the same ic...

you should check out the reset circuit works

I installed new 68901 IC - no result. Any further ideas ? How can I test reset circuit ?
by avtandil
Sun Oct 17, 2010 5:32 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

yes i beleve its the same ic... you should check out the reset circuit works Seems that it was a chip - when I put the ones from STE to old STFM , the last stop working. But also STE with changed chip is not working, maybe I broke ic during swapping ;-( Update: In two days I will get the new 68901 ...
by avtandil
Sat Oct 16, 2010 2:23 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

simbo wrote:yes i beleve its the same ic...

you should check out the reset circuit works

How ?
by avtandil
Sat Oct 16, 2010 6:31 am
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

looking over your topic you need a mc68901 ic i would replace this first Dear Simbo, thanks a lot for your reply. After analising diagram I also think that mc68901 is guilty. Just one question- My STE chip is marked like this: P9135 MK 68901N-04 May I replace it by the one taken from 520ST which is...
by avtandil
Fri Oct 15, 2010 10:02 am
Forum: Applications
Topic: TOS ROM image file description
Replies: 4
Views: 1233

Re: TOS ROM image file description

Dear Atarians ! Last year I saw somewhere in the net info about TOS ROM image description (like first byte is for this, second for that and so on), but can't find it again. Maybe someone can help to find this info ? Thanks ! Finally I found those info - I read it at http://www.atari-forum.com/viewt...
by avtandil
Fri Oct 15, 2010 9:05 am
Forum: Applications
Topic: TOS ROM image file description
Replies: 4
Views: 1233

Re: TOS ROM image file description

There may be a better resource somewhere but I know there was a post by Techie Alison. Took a bit of searching, but I have found it: http://www.atari-forum.com/viewtopic.php?f=14&t=16639&p=146196&hilit=+split#p146196 There may be a resource that is more extensive but essentially, you can look at an...
by avtandil
Thu Oct 14, 2010 3:22 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

wongck wrote:meaning the problem is somewhere on the motherboard rather than some accessories / memory.
I also think so.
wongck wrote:If it is, then Simbo or Alison ought to step in, as they are the hardware guru.

OK, Simbo / Alison, please help !!!!
by avtandil
Wed Oct 13, 2010 4:55 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

wongck wrote:
avtandil wrote:
Tried to exclude 2xRAMS and FDD - the same.
Does this isolate to the mobo then?
If it is, then Simbo or Alison ought to step in, as they are the hardware guru.
Sorry I didn't understand your question. Could you please clarify ?
by avtandil
Wed Oct 13, 2010 7:03 am
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

STE right? My normal course of action is normally try to remove as much hardware accessories as possible. Remove the floppy drive and try. Remove a couple of ram stick and try (you need at least some ram to boot). Press lightly on the IC that are mounted on sockets and try. the RAM is loaded in pai...
by avtandil
Mon Oct 11, 2010 4:20 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

Monitor was connected, any normal software is available, but to run soft I should load TOS first isn't it ? ;-) STE has TOS in ROM. So you do not need to load anything from floppy. Take out any floppy and power on. After sometime, the desktop ought to appear. If the floppy drive is bad, you get no ...
by avtandil
Mon Oct 11, 2010 3:38 pm
Forum: Hardware
Topic: STE 1040 is not running
Replies: 53
Views: 7925

Re: STE 1040 is not running

The only reason is that..... if you have a disk that Auto boot's, and it actually does then this might eliminate a course of action! It's a bit of a round about method, but you lose nothing in trying. It might be the floppy light that has gone and the display! Which means if the disk picks up then ...

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