Hi retro fans..
I go by the name Vipersan.
I'm 68 years young and repair/maintain a lot of computers though I confess most of these are commodore or PC.
In short I have a bit of a museum thing going on.
I have never worked on Atari but recently was gifted an Atari 520 STe in non working condition.
Black screen.
I deduced the Xhalt line was being activated...this turned out to be 2x open traces between CPU and roms.
traces fixed I was rewarded with the GEM green screen.
but that was only the first hurdle.
Connecting up a floppy drive resulted in ..well...nothing.
I suspected it was damaged at first..but now I'm suspecting a problem on the mainboard ...having tried a modified Sony and getting the same result.
So I purchased a diagnostic cart pcb ...but although it boots can take up to minute to display all the menu options.
Surely this can't be right ?
A lot of the tests passed ..but noteably the floppy test failed as did the DMA test which I am assuming can be floppy related ?
At this point I am asking for help ..which is why I joined Exxos foum today
regards to all
VS
You will not be able to post if you are still using Microsoft email addresses such as Hotmail etc
See here for more information viewtopic.php?f=20&t=7296
See here for more information viewtopic.php?f=20&t=7296
DO NOT USE MOBILE / CGNAT DEVICES WHERE THE IP CHANGES CONSTANTLY!
At this time, it is unfortunately not possible to whitelist users when your IP changes constantly.
You may inadvertently get banned because a previous attack may have used the IP you are now on.
So I suggest people only use fixed IP address devices until I can think of a solution for this problem!
At this time, it is unfortunately not possible to whitelist users when your IP changes constantly.
You may inadvertently get banned because a previous attack may have used the IP you are now on.
So I suggest people only use fixed IP address devices until I can think of a solution for this problem!
Please make sure you are logged in for at least 2 hours
to make sure your IP is added into the firewall whitelist, thanks
to make sure your IP is added into the firewall whitelist, thanks
Hi from Manchester UK
-
rubber_jonnie
- Site Admin
- Posts: 14168
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Hi from Manchester UK
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: Hi from Manchester UK
If the DMA and CPU are in sockets, first point of call is to reseat them. Also a image if your board would help as there are several revisions.
Re: Hi from Manchester UK
Board revision is CA4003290 1989
CPU has already been removed ,...socket had deoxit applied then reseated
- P1290022.JPG (428.51 KiB) Viewed 203 times
- P1290021.JPG (419.31 KiB) Viewed 203 times
- P1290020.JPG (377.98 KiB) Viewed 203 times
- P1110002.jpg (465.76 KiB) Viewed 203 times
-
stephen_usher
- Site sponsor
- Posts: 7167
- Joined: Mon Nov 13, 2017 7:19 pm
- Location: Oxford, UK.
- Contact:
Re: Hi from Manchester UK
Intro retro computers since before they were retro...
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
ZX81->Spectrum->Memotech MTX->Sinclair QL->520STM->BBC Micro->TT030->PCs & Sun Workstations.
Added code to the MiNT kernel (still there the last time I checked) + put together MiNTOS.
Collection now with added Macs, Amigas, Suns and Acorns.
Re: Hi from Manchester UK
Welcome to the forum!
Re: Hi from Manchester UK
Welcome - you're gonna love it!
Welcome To DarkForce! www.darkforce.org "The Fuji Lives.!"
Atari SW/HW based BBS-Telnet:darkforce-bbs.dyndns.org 1040
Atari SW/HW based BBS-Telnet:darkforce-bbs.dyndns.org 1040
-
rubber_jonnie
- Site Admin
- Posts: 14168
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Hi from Manchester UK
@Vipersan
So my first question to you would be 'are the drives set to ID0?'
Although you mention a modified Sony drive, you don't say what the mod is and all ST drives should be set to ID0.
If the ID is set to 0 and the drive is correctly connected I'd run the floppy tests from the diag cart and see what the results show.
So my first question to you would be 'are the drives set to ID0?'
Although you mention a modified Sony drive, you don't say what the mod is and all ST drives should be set to ID0.
If the ID is set to 0 and the drive is correctly connected I'd run the floppy tests from the diag cart and see what the results show.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: Hi from Manchester UK
Yes the original and the modified floppies are set to drive ID zero.
Both of which are seen ...they both pass the motor speed test.
When testing the heads move....but neither drives read write..format etc.
Having just watched a youtube video from retro computing reboot ..(
I'm now fairly convinced that the DMA chip is likely suspect.
Apparently failed DMA chips are common.
The blank floppy experience is just the same as mine...and I know there is data on the disk.
Next question is where would I get a suitable 40 pin replacement...?
rgds
VS ...and thanks for the warm welcome
Both of which are seen ...they both pass the motor speed test.
When testing the heads move....but neither drives read write..format etc.
Having just watched a youtube video from retro computing reboot ..(
I'm now fairly convinced that the DMA chip is likely suspect.
Apparently failed DMA chips are common.
The blank floppy experience is just the same as mine...and I know there is data on the disk.
Next question is where would I get a suitable 40 pin replacement...?
rgds
VS ...and thanks for the warm welcome
Re: Hi from Manchester UK
So it would appear I do indeed have the 'dodgy' DMA chip in this Atari (CO25913-38)
Found someone on ebay selling similar for £3 each ..they could be fake of course ...but took a chance and placed an order for 3 pieces.
Tomorrow I will attempt 40 pin chip removal and fit a socket.
Just hope I dont damage the pcb in the process.
..and apologies to Exxos for splitting the thread.
It wont happen again.
rgds
VS
Found someone on ebay selling similar for £3 each ..they could be fake of course ...but took a chance and placed an order for 3 pieces.
Tomorrow I will attempt 40 pin chip removal and fit a socket.
Just hope I dont damage the pcb in the process.
..and apologies to Exxos for splitting the thread.
It wont happen again.
rgds
VS