Search found 5 matches

by axeman
Sun Mar 01, 2020 12:33 pm
Forum: Dragon Hardware
Topic: Dragon 32 ROM Fault
Replies: 0
Views: 1046

Dragon 32 ROM Fault

Hi,

I'm trying to get this dragon back to working glory and I've traced the fault to chip IC18. Is this the basic rom chip? Can I just download the basic file from xroar and program it onto a 27C128 with an adapter to emulate 2532 ?
by axeman
Fri Feb 28, 2020 9:08 pm
Forum: Dragon Hardware
Topic: Dragon 32 Blank Screen Fault
Replies: 5
Views: 1152

Re: Dragon 32 Blank Screen Fault

Turns out touching the crystal to get it to boot wasn't a clue but it did allow me to test the keyboard. I could only get key h,x,8,0 to work so this was a big clue. Traced the fault to the PIA 6821 IC26. Removed it and socketed then tested in a working machine and got the same fault, no boot up and...
by axeman
Thu Feb 27, 2020 4:49 pm
Forum: Dragon Hardware
Topic: Dragon 32 Blank Screen Fault
Replies: 5
Views: 1152

Re: Dragon 32 Blank Screen Fault

Latest update to this issue is that I ended up not socketing and replacing the Ram as I thought I would first try socketing the right most ROM chip as some have said it is a major cause of such symptoms but that didn't help and the ROM was fine. I did however have a major breakthrough with getting t...
by axeman
Wed Feb 19, 2020 1:16 am
Forum: Dragon Hardware
Topic: Dragon 32 Blank Screen Fault
Replies: 5
Views: 1152

Dragon 32 Blank Screen Fault

Hi, I have a D32 which just displays a blank green screen. I've checked the +-5, 12 voltages which are all ok on the ram ,cpu, sam and various other places so I think the voltages are ok. I've also swapped all the socketed chips into a working dragon and they all work ok. Anyone got any ideas or tro...
by axeman
Tue May 28, 2019 11:14 pm
Forum: Dragon Hardware
Topic: DragonMMC Announcement.
Replies: 65
Views: 39055

Re: DragonMMC Announcement.

Hi,
Is the DragonMMC still available for sale?
Regards
Tom