Forgottenmyname - Progress - Part 2

Where Alpha builders can post pics and progress etc
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PhilC
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Re: Forgottenmyname - Progress - Part 2

Post by PhilC » Sat Jun 29, 2019 5:15 pm

Its actually ST4.4 diag cart and I can't find any description in the manual about I1 errors.

Will try Diagrom and see if that gives us some more insight
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Re: Forgottenmyname - Progress - Part 2

Post by exxos » Sat Jun 29, 2019 5:26 pm

ahhh ok, so likely its writing all zeros but reading 1 back I would assume. So either the address isn't being driven somewhere, or its shorted to 5V somewhere.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

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Re: Forgottenmyname - Progress - Part 2

Post by PhilC » Sat Jun 29, 2019 5:32 pm

And that's the bit I cant find. As I say, the right 0s are D0 to D15 burnout sure about the left lot unless they are address lines. But if so, A0-A15 seem ok as well
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Re: Forgottenmyname - Progress - Part 2

Post by exxos » Sat Jun 29, 2019 5:35 pm

Would assume its dataline 1 (bit 1) which is stuck high.
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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Re: Forgottenmyname - Progress - Part 2

Post by PhilC » Sat Jun 29, 2019 5:58 pm

Ok, so they are both data register bits. Fixed D1 on the left 4 falcon ram chips, now D1 on the other side playing up, LOL. Time to check my soldering
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Re: Forgottenmyname - Progress - Part 2

Post by PhilC » Sat Jun 29, 2019 6:57 pm

1 new ram board required. Haven't got any more SMT ram and can't be arsed to remove the chips again.

I did find a lifted track underneath one of the ram chips but fixing that has now given me a I2 ram disturbance.

So time for a new ram solution. Two steps forward with this one but one step back.

It's having a difficult birth this Alpha board but born it will be, dragged kicking and screaming into the real world (well hopefully anyway)
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Re: Forgottenmyname - Progress - Part 2

Post by PhilC » Sun Jun 30, 2019 2:34 pm

And another step sideways, LOL.

I've just tried turning the Alpha on today and I actually get a garbled menu for the diag cart. Pushing the relevant buttons carries out the relevant tests as far as I can see at least but the monitor screen stays a 50hz black, LOL.

what do you all think of this?
dodgyserial.PNG
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Re: Forgottenmyname - Progress - Part 2

Post by PhilC » Sun Jun 30, 2019 2:49 pm

I've put Diagrom into the Alpha and I get a bit better serial output but still no video. It does let me check the memory out and surprisingly it passes, have tried 3 times now as I didnt believe it.

I'm now wondering if the lack of output is something wrong with the shifter, so I'd better go look for another one if those.
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Re: Forgottenmyname - Progress - Part 2

Post by PhilC » Sun Jun 30, 2019 3:03 pm

And...............

ITS ALIVE!!!!!!!!
20190630_150203.jpg
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Sorry the pic is a bit crappy, I've got a loose connection on the video by the looks of things
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Re: Forgottenmyname - Progress - Part 2

Post by exxos » Sun Jun 30, 2019 4:04 pm

:cheer: :cheer: :cheer: :cheer:
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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