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Converting from Issue 3 to Issue 4 could be as simple as swapping the 7905 reg for a 7912, if you don't mind losing the TV output. An issue 3 schematic would be useful to confirm this. There is some video level shift circuitry on the issue 4 that seems to be absent on the issue 3. I remember doing t...

That's a really impressive collection. I've been looking at these on youtube and I find 'Pitman' particularly appealing.

Also quite a skill to write action games in Basic. Brilliant!

Great to hear you've got it working and as RWAP also said, it wouldn't be hard to reproduce the PSU board. Though there are alternatives... One of my Dragons, hidden in my attic somewhere, doesn't have a PSU board at all. It's got a switch mode PSU, built in speaker and 3.5" disk drive, but that's a...

I've just been looking at the schematics and photos and it seems to me that issue 3 PSU boards are for D32s and issue 4 boards are for D64s A key difference is the PSU voltage on pin 3. D32s have -5V here and D64s have -12V. Putting the issue 3 board in a D64 shouldn't do any damage but there isn't ...

Now there's a man who is dedicated to his art!

I hope you've saved some surprises for the demo Should drop a few jaws the way things are shaping up...

Could it be because the Dragon ROM checks the MSB of $ff03 is set to confirm vsync is the source of the irq before branching to the TIMER update code?

Working from old notes, so at the risk of getting something wrong... The VDG is synchronised perfectly with the 6809 due to the action of the SAM, so the number of cycles per video frame will be constant and independent of the crystal frequency. 57 cycles per line 312 lines per frame (262 lines from...

Does anyone have the Larkspur Waldorf Journey Home instructions? I had another look in the loft. I knew I had it somewhere. No hint sheet this time but here are the instructions: Background You control the luckless Larkspur Waldorf. He has escaped from a castle and must now find his way home. All h...

I'd forgotten just how much I enjoyed playing these games. I remember saving up my pocket money for weeks to buy Manic Miner from Boots and I was lucky enough to win Jet Set Willy in a Dragon User competition.

I'm sure the twisted sense of humour had a lasting effect on me as well

The instructions I have are pretty short: Background You control the luckless Larkspur Waldorf. He is trapped inside a deserted castle on a high rocky outcrop. You must help him to escape. Controlling Larkspur When prompted with ">", you can enter a one or two word command eg. "LOOK" or "GO NORTH". ...