PhilCs H5 A3 build

[stephen_usher]

Obviously a blue meenie as he doesn't want to share his blueness.

[PhilC]

Got my reset problem fixed and got some blue and even green now. Not sure where the black went :lol:

20201031_181032.jpg

[stephen_usher]

Trying to make people green with envy using a pull-up? ;-)

[PhilC]

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.

[stephen_usher]

:lol:

[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

[stephen_usher]

Is the Shifter not changing res then?

[PhilC]

Is the Shifter not changing res then?

No, it stays in low res

[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.

[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.