Brett's STE - Repair thread
- stephen_usher
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Re: Brett's STE - Repair thread
Surely you only get gremlins if you feed them after midnight?
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.
- rubber_jonnie
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Re: Brett's STE - Repair thread
Maybe that was why it still wasn't workingstephen_usher wrote: ↑Thu Jan 27, 2022 9:10 am
Surely you only get gremlins if you feed them after midnight?
Or did I mean pixels....
I'm so confused....
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...
- rubber_jonnie
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Re: Brett's STE - Repair thread
Ok, so the track is good along the bottom of the board from the DMA. It is then good through the via to the top of the board. Where it comes out is shown by the red circle.derkom wrote: ↑Thu Jan 27, 2022 5:57 amWould be interesting (and possibly educational) to know where exactly the track broke. Have you narrowed that down yet?rubber_jonnie wrote: ↑Wed Jan 26, 2022 11:21 pm I'm feeling like a minor celebration. I traced A1 and found that it should be connected to pin 2 of the DMA. Only it wasn't, so I hooked it up and I now get this:
The red arrow indicates a spot just before the ROM sockets where I removed the solder mask in order to buzz it out, and it is good up to that point. The damage is therefore likely to be the trace that was originally damaged at the ROM socket, so pin 12 of the HI ROM socket.
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: Brett's STE - Repair thread
Great progress!
I had a similar output the other day that turned out to be a couple of shorted address lines.
BW
I had a similar output the other day that turned out to be a couple of shorted address lines.
Don't forget the diag cart also talks over serial!rubber_jonnie wrote: ↑Wed Jan 26, 2022 11:21 pm Clearly some work left to be done, but the little red led on my diag cart which shows ROM access is now flickering, a good indicator that ROM access is at least being tried. It was completely dead up until now.
BW
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DSTB1 Open source 16Mhz 68k and AltRAM accelerator for the ST
Smalliermouse ST-optimised USB mouse adapter based on SmallyMouse2
FrontBench The Frontier: Elite 2 intro as a benchmark
- rubber_jonnie
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Re: Brett's STE - Repair thread
Yep, going to hook up to my HP Jornada over serial later, see if it gives me anythingBadwolf wrote: ↑Thu Jan 27, 2022 1:43 pm Great progress!
I had a similar output the other day that turned out to be a couple of shorted address lines.
Don't forget the diag cart also talks over serial!rubber_jonnie wrote: ↑Wed Jan 26, 2022 11:21 pm Clearly some work left to be done, but the little red led on my diag cart which shows ROM access is now flickering, a good indicator that ROM access is at least being tried. It was completely dead up until now.
BW
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...
- stephen_usher
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Re: Brett's STE - Repair thread
I'm waiting for the next episode... Did you get any time to look at the machine last night?
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.
- rubber_jonnie
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Re: Brett's STE - Repair thread
Sadly no time yesterday, and today is unlikely too, we've had some family stuff going on that has been a bit of a diversion, so my repair time has been limited.stephen_usher wrote: ↑Fri Jan 28, 2022 9:13 am I'm waiting for the next episode... Did you get any time to look at the machine last night?
I did try both diag carts, but still nothing. I need to hook up my 2nd bench PSU before I try the serial port though as I think the serial ICs need 12v. I'll see if I can at least do that. I had done it initially but got nothing.
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...
- stephen_usher
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Re: Brett's STE - Repair thread
Fair enough. I hope that the family stuff gets sorted soon.
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.
- rubber_jonnie
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Re: Brett's STE - Repair thread
Cheers, me too!stephen_usher wrote: ↑Fri Jan 28, 2022 9:50 am Fair enough. I hope that the family stuff gets sorted soon.
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: Brett's STE - Repair thread
Just a thought.. When you say your limiting the amps, do you mean you have the psu set to limit at say 2.5amps, or have you limited the amps the STE is trying to pull ?
It is dependent on voltage and other things, but a machine doesn't always pull the same amount as another. So if the machine is trying to pull 2 Amps, and your limiting to 1.8amps, then it will add to your troubles.
It is dependent on voltage and other things, but a machine doesn't always pull the same amount as another. So if the machine is trying to pull 2 Amps, and your limiting to 1.8amps, then it will add to your troubles.
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.