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In sg4 IIRC d7 also goes to the a/s pin on the vdg, and then bits 0..3 select one of 16 patterns. Bits 4..6 select 1 0f 8 colours. So I suspect if d7 is high and a/g islow all 8 bits need togo to the vdg.

Cheers.

Phill.

Here's the Eagle schematic that I traced from my Plus board, this may be of some help.
Cheers.

Phill.

It would be nice to check Phill's prom dump and mine to be sure they are ok. Thanks for the new disk images! I Checked my dump of Simon's prom with another one uploaded here and they where binary identical, was probably yours then Rob, which means we have a good dump......or both dumps are bad in t...

Well, I would only be too happy to organise another one - and I agree, it's tempting to do it for a little longer too. I also have a couple ideas as to how to improve it too! Shall we pencil in the same weekend for 2018? :) Sounds like a plan but why wait a year :) :) The Acorn bods are up to 3-4 a...

I will echo what everybody else has said - was great to meet up - didn't get the chance to chat to everybody, or for long enough. I think its safe to say we do need to do this again, maybe over 2 days. I'll echo this. The way the Acorn guys often do it is to meetup on friday night, and go home on S...

Hi all happy to bring my Alpha, she's still semi disassembled anyway from when I took the addon boards out to trace / reproduce. Would be good also if I could get some measurements for the drive eject buttons as my machine doesn't have them. Will bring soldering iron and tools too,and probably my tw...

Hi all, As part of the testing of the pre-production Prototypes of DragonMMC, my testers and I are finding some cas files that won't work with the interface because they are not correctly bit to byte aligned. We have found that re-writing them through XRoar will fix this and that the correctly bit a...

Just one question, How did you make the DOS calls?

If you correctly used the jump table at the beginning of the DOS ROM, then this should work on the DragonMMC's DOS emulation.

Cheers.

Phill.

Is the source available anywhere, including the auto-start loader, I'd like to try and work out why the CAS version is not working with DragonMMC's MTAPERUN? I did the loader and I don't think the CAS version does anything particularly special: it's basically just the output from bin2cas.pl. The au...

Is the source available anywhere, including the auto-start loader, I'd like to try and work out why the CAS version is not working with DragonMMC's MTAPERUN?

Cheers.

Phill.