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PhilCs H5 A3 build

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stephen_usher
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Re: PhilCs H5 A3 build

Post by stephen_usher »

Obviously a blue meenie as he doesn't want to share his blueness.
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.
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Re: PhilCs H5 A3 build

Post by PhilC »

Got my reset problem fixed and got some blue and even green now. Not sure where the black went :lol:
20201031_181032.jpg
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Re: PhilCs H5 A3 build

Post by stephen_usher »

Trying to make people green with envy using a pull-up? ;-)
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: PhilCs H5 A3 build

Post by PhilC »

stephen_usher wrote: 31 Oct 2020 18:22 Trying to make people green with envy using a pull-up? ;-)
Nah, I'm starting to think there is something wrong with the DAC, so I'll order another from exxos.

Mono mode works great though and everything else works great

Edit:

Definitely thinking something odd eith this DAC as every time I reboot there's a good chance the colors will change :lol: it was a lovely shade of cyan just now.
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Re: PhilCs H5 A3 build

Post by stephen_usher »

:lol:
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: PhilCs H5 A3 build

Post by PhilC »

I've got the H5 on the bench today to try and work out what's broken with it as ive done all the fixes, am using good chips, etc.

This is what I get when we boot to a floppy in medium resolution.
20201105_171646.jpg
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Re: PhilCs H5 A3 build

Post by stephen_usher »

Is the Shifter not changing res then?
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: PhilCs H5 A3 build

Post by PhilC »

stephen_usher wrote: 05 Nov 2020 17:56 Is the Shifter not changing res then?
No, it stays in low res
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Re: PhilCs H5 A3 build

Post by stephen_usher »

Does it look OK if started in low res?

I'm wondering if a data line isn't connected and hence the wrong data is going into a register. Either that it an address line and it's not writing the data into the right I/O port location.

I take it that you've 'scoped all the data and address lines.
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.
Top
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PhilC
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Re: PhilCs H5 A3 build

Post by PhilC »

And we're fixed.
20201105_203025.jpg
RW on the shifter has a fault on the pcb, I fitted a bodge wire from pin 9 on IO port 1 to pin 31 on the shifter and were all up and running, so no wonder things were confused.
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