exxos's H5 A3 Build

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exxos
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Re: exxos's H5 A3 Build

Post by exxos »

So it seems to have that odd fault where I can format a floppy, access it, save desktop.inf, all fine, but it refuses to read any other floppies despite being created on the same floppy drive on the H4 :shrug:

EDIT:

OK the above was single sided format.. I tried double sided and it completed the format kinda... :shrug: and can't access floppy A: again :roll:

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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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Re: exxos's H5 A3 Build

Post by exxos »

The only difference between SS and DS seems to be a register in the 1772.. I have continuity checked a lot of the lines between the DMA, 1772, checked various lines of activity, re-solder the floppy port, change the cable, change the floppy drive, change the 1772 and DMA.. I cannot really think of anything else to do..

Won't have any time today to work on it, but I think we will just have to see if someone else has the same problem to see if it's a actual problem on the design or just my board.. But the whole DMA circuit was copied from the hate for and is tried and tested anyway, so I don't see what could really go wrong.
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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.
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Re: exxos's H5 A3 Build

Post by stephen_usher »

Not more crossed wires I hope.
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.
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Re: exxos's H5 A3 Build

Post by exxos »

stephen_usher wrote: Wed Oct 28, 2020 10:08 am Not more crossed wires I hope.
Nothing changed on the DMA circuit other than adding the inverter, but that was tested on the H4 DMA bodge boards. otherwise its the same circuit.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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.
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Re: exxos's H5 A3 Build

Post by Steve »

@exxos Have you done the MANDATORY FIXES? LOL ;D
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Re: exxos's H5 A3 Build

Post by PhilC »

@Steve its obviously a Bad DMA :lol:
If it ain't broke, test it to Destruction.
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Re: exxos's H5 A3 Build

Post by exxos »

Only just got home, though sound SIDE0_SEL from the YM chip isn't pulsing high and low like it does on the H4.. I've changed the YM chip.. so its not that.. so need to dig more...
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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.
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Re: exxos's H5 A3 Build

Post by exxos »

Taa'Daaa

I win I win I win

:cheer: :cheer: :cheer: :girldance: :girldance: :girldance:

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https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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.
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Re: exxos's H5 A3 Build

Post by stephen_usher »

What was the problem?
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.
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Icky
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Re: exxos's H5 A3 Build

Post by Icky »

exxos wrote: Thu Oct 29, 2020 2:53 pm Taa'Daaa

I win I win I win
Give that man a booby prize :twisted:
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