If you have the ability to take a couple of good quality digital pictures (top and bottom of board) and post them somewhere, I could have a go at tracing the board, which might help work out what it's for.
Cheers.
Phill.
Search found 268 matches
- Fri Aug 14, 2009 2:03 am
- Forum: Dragon General
- Topic: Extra PCB fitted to Dragon 32
- Replies: 14
- Views: 10740
- Fri Aug 14, 2009 2:00 am
- Forum: Dragon General
- Topic: communications through the printer port
- Replies: 2
- Views: 2390
Re: communications through the printer port
Welll...looking at the circuit diagram the Dragon paralell port has available the PIA lines that the CoCo uses for it's serial bit-banger, so you could in theory use this (with apropreate software) use the lines as a CoCo bit-banger port. You would of course also need a level shifter between the 5v/...
- Sat Aug 08, 2009 2:38 am
- Forum: Uploads
- Topic: Dragon 64k PAL Video Schematic
- Replies: 6
- Views: 7135
Re: Dragon 64k PAL Video Schematic
That is most excellent.....humm wonder if I could use bits of that circuit to make a colour board for my Acorn Atom clone (or the original Atom come to think of it) as they both also use the 6847 VDG.
Cheers.
Phill.
Cheers.
Phill.
- Wed Jul 22, 2009 1:32 am
- Forum: Dragon General
- Topic: Co-Co Ram size detection?
- Replies: 11
- Views: 7069
Re: Co-Co Ram size detection?
Bad luck with the 16K, but there are an awful lot of them out there. At least you didn't get an ultra-early 4K model. ;) (Or maybe they're worth more?) Yeah I believe so as the majority where upgraded..... Upgrading might be possible... And for the most part with a CoCo 1 which is what the OP has, ...
- Wed Jul 08, 2009 1:30 am
- Forum: Dragon General
- Topic: Wanted Quickshot 1 or 2 for Dragon/Co-co
- Replies: 3
- Views: 3067
Re: Wanted Quickshot 1 or 2 for Dragon/Co-co
I have a couple of the voltmace sticks and they are quite nice also, as they are also self centering.
I believe they where also available for the BBC too.
Cheers.
Phill.
I believe they where also available for the BBC too.
Cheers.
Phill.
- Fri May 29, 2009 10:59 pm
- Forum: Dragon General
- Topic: General Instruments AY sound chip interface?
- Replies: 4
- Views: 3332
Re: General Instruments AY sound chip interface?
The Dragon Alpha also had one as standard (AY-3-8912), used it for sound and to control the drive selects on the disk interface. It would be possible to add this to a Dragon 32/64, but would require socketing one of the PIAs, and adding a second, the AY was connected to one of the ports on the 3rd P...
- Sun May 17, 2009 11:08 am
- Forum: Dragon General
- Topic: Cartridge question
- Replies: 4
- Views: 3449
Re: Cartridge question
What puzzles me is that only the first of the two socketed chips have the "erase window". Maybe they used a mixed of EPROMS and non erasable roms? I have seen some EPROMS used in Dragon carts where instead of the sticker, the window was painted black. The other posibility is that the second chip is...
- Fri Apr 10, 2009 1:54 am
- Forum: Dragon General
- Topic: Tano Dragon 64
- Replies: 42
- Views: 29818
Re: Tano Dragon 64
In short no.... for the following reasons: 1. The D32 and D64 power boards are slightly different although the later D32 PSU boards should work Though it is pretty easy to convert one to the other, by switching the 7912 regulator for a 7905, or vice-versa, 7912 is -12V for the 64, 7905 is -5V for t...