Search found 466 matches

by sorchard
Thu Jul 22, 2021 11:25 am
Forum: Dragon General
Topic: Project 2
Replies: 43
Views: 8972

Re: Project 2

Your demos never get old. Every aspect is done to such a high standard that it's a pleasure to see.

If you're looking for a more critical opinion, my eleven year old says your game looks cool. And this is from someone who is obsessed with playing Terraria and Mindustry online with his friends :)
by sorchard
Tue Jun 29, 2021 2:11 pm
Forum: Dragon General
Topic: Does Mr Dig work properly?
Replies: 1
Views: 397

Re: Does Mr Dig work properly?

Cuthbert Dragon did a video a couple of months ago so it definitely does work on a D32.

https://www.youtube.com/watch?v=UzHbQRgM-_w

I tried disk and tape 'play now' options in the archive and they seem to work ok.
by sorchard
Wed Jun 23, 2021 4:26 pm
Forum: Dragon Hardware
Topic: 6809/6809E compatibility
Replies: 7
Views: 987

Re: 6809/6809E compatibility

Hi Rob! In general the internal/external clock versions are not interchangeable so I am amazed it works at all. As you say, there are a number of pin differences but the ones that matter in the Dragon are the E and Q directions. So in your D64 you have both SAM and CPU trying to drive the E and Q cl...
by sorchard
Wed Jun 16, 2021 5:16 pm
Forum: Dragon General
Topic: Project 2
Replies: 43
Views: 8972

Re: Project 2

Yes please Steve!
by sorchard
Sat Jun 12, 2021 8:34 pm
Forum: Dragon General
Topic: DRAM data retention time
Replies: 18
Views: 4206

Re: DRAM data retention time

A Z7 invert option is a great idea. I wish it would fit but unfortunately the GAL only has one spare I/O, and that would get used up just by adding the register. I wonder if any OS support was produced for the original banker board? There was no mention of it in the Hot CoCo article. Edit: Drivers w...
by sorchard
Tue May 25, 2021 10:46 pm
Forum: Dragon Hardware
Topic: Diagnosing and repairing a faulty 64
Replies: 4
Views: 927

Re: Diagnosing and repairing a faulty 64

The firq interrupt source from the cartridge port doesn't go directly to the cpu but via one of the pia chips. That said, your chess cartridge started up ok so it's probably fine. The nmi line can be manually pulled down to ground with the machine on. Maybe via a 220 ohm resistor to be on the safe s...
by sorchard
Mon May 24, 2021 9:00 pm
Forum: Dragon Hardware
Topic: Diagnosing and repairing a faulty 64
Replies: 4
Views: 927

Re: Diagnosing and repairing a faulty 64

Do you have an autostart cart other than DOS/CoCoSDC? That would test the firq line. I'd be tempted to write NMI and FIRQ handlers to help test if those lines are working when manually pulled down. Might be worth getting hold of a SAM & 6809E just to try. I've managed to blow the interrupt circuit i...
by sorchard
Mon May 24, 2021 8:44 pm
Forum: Dragon General
Topic: DRAM data retention time
Replies: 18
Views: 4206

Re: DRAM data retention time

I invited a hijack by mentioning the memory upgrade at the start so I can't get mad ;) It sounds like Ciaran's upgrade is going to be more plug and play than mine, as he's looking at an MMU, plus the upgrade board hosts the memory. I've gone old school with my upgrade: It's based on a design for the...
by sorchard
Fri May 14, 2021 4:36 pm
Forum: Dragon Hardware
Topic: Dragon to CoCo
Replies: 10
Views: 1901

Re: Dragon to CoCo

v0.36.2 print to file works for me on my Win7 work laptop

A few things to watch out for:
- No quotes required around the file name
- The file is not flushed until xroar is closed
- The file is appended each time xroar is run so you need to delete the file when you are done with its contents
by sorchard
Wed May 12, 2021 10:17 am
Forum: Dragon General
Topic: pause a listing
Replies: 3
Views: 1190

Re: pause a listing

shift @ on a real machine. This also pauses basic programs.

shift space does the same thing in xroar.