Search found 226 matches

by Rolo
Fri Feb 22, 2013 10:42 pm
Forum: Hints and Tips
Topic: Schematics of Dragon Cartridges?
Replies: 23
Views: 3848

Re: Schematics of Dragon Cartridges?

If you want, I'll put a meter on the Dragon Chess board tonight and see what those connections are. Yeah, maybe this would be a good idea. This is the Dragon archive, so it does make sense to store all the information one can get about computer and peripherals. The description of the cartridges is ...
by Rolo
Wed Feb 20, 2013 12:47 am
Forum: Hints and Tips
Topic: Schematics of Dragon Cartridges?
Replies: 23
Views: 3848

Re: Schematics of Dragon Cartridges?

Yes, I saw the scans, but some connections are hidden by the NAND (Pin 11, Pin 1, the two inputs 4 and 12 seem to be connected, but I cannot see, what's fed in). I own no cartridge, so I can't simply make some measurements. But as Rink pointed out, there is no need anymore to take small EEPROMS and ...
by Rolo
Sun Feb 17, 2013 9:51 pm
Forum: Hints and Tips
Topic: Schematics of Dragon Cartridges?
Replies: 23
Views: 3848

Re: Schematics of Dragon Cartridges?

Wow, thank you for the response. Seems to be an interesting issue :) Strange enough, on other platforms you can find a variety of cartridges. For the Dragon I could not find any. And the machine was quite popular in England, wasn't it? Concerning the PCB. I found an old and unused ISA-formfactor exp...
by Rolo
Sat Feb 16, 2013 8:30 pm
Forum: Hints and Tips
Topic: Schematics of Dragon Cartridges?
Replies: 23
Views: 3848

Re: Schematics of Dragon Cartridges?

Hi Rink,
well I wanted to play around with it, try to make a cartridge, maybe a simple multicart with a bigger EPROM, if I find the time. So a sample cartridge or PCB would be appreciated.
by Rolo
Wed Feb 13, 2013 9:09 pm
Forum: Hints and Tips
Topic: Schematics of Dragon Cartridges?
Replies: 23
Views: 3848

Schematics of Dragon Cartridges?

Hi.
Does anybody have schematics of a Dragon cartridge PCB? Or photos with desoldered parts, where one can see all the connections? What's beneath the 74LS00? :?:
Regards,
Rolo
by Rolo
Sun Feb 10, 2013 8:07 pm
Forum: Uploads
Topic: Dragon joysticks
Replies: 0
Views: 555

Dragon joysticks

I've bought a Dragon32 recently. I still can remember, when it appeared in the shops. I considered to get one those days, but in Germany, it was wiped away by the Commodore 64. Well, I made up for it now. :D One of the joysticks was damaged, so I wanted to open it. Hm, where are the screws? Beneath ...