Search found 28 matches

by acsi
Mon Apr 27, 2015 11:21 am
Forum: Software Requests
Topic: Does anyone have.. Robo by Dragon Power Software?
Replies: 5
Views: 6017

Re: Does anyone have.. Robo by Dragon Power Software?

According to this wiki the original was made for the CoCo http://en.wikipedia.org/wiki/List_of_RoboCop_video_games Not sure if it has been ported or will run on the Dragaon http://i1071.photobucket.com/albums/u507/acsidental/168382-robocop-trs-80-coco-screenshot-fighting-the-boss-on-level_zpsjrtww82...
by acsi
Fri Aug 30, 2013 10:31 am
Forum: Hints and Tips
Topic: bricked dragon 32...
Replies: 27
Views: 13314

Re: bricked dragon 32...

Hi This looks very similar to what my Dragon 32 was doing. Turned out to be a faulty VDG chip. Got a replacement off eBay and it worked fine afterwards. At least until the SAM chip failed later on :cry: Anyway here is the link to my posts about it. http://archive.worldofdragon.org/phpBB3/viewtopic.p...
by acsi
Wed Jan 23, 2013 6:08 am
Forum: Dragon General
Topic: Faulty Dragon32
Replies: 16
Views: 11155

Re: Faulty Dragon32

Alrighty my day just got better.

The replacement MC6847P arrived today. Popped it in and now she is running again. :D

Murphy's law states it will that the faulty chip will always be the last one you replace.
by acsi
Wed Jan 16, 2013 11:23 am
Forum: Dragon General
Topic: Faulty Dragon32
Replies: 16
Views: 11155

Re: Faulty Dragon32

Whats the chance this could be a faulty VDG?
by acsi
Wed Jan 16, 2013 2:22 am
Forum: Dragon General
Topic: Faulty Dragon32
Replies: 16
Views: 11155

Re: Faulty Dragon32

OK I have replaced the 74LS273 IC13 and tested the signal as best I can for the HS although the schematics I have are not very easy to read. As far as I can tell the signal getting to the VDG and SAM are equal.

Can anyone confirm which pins I should be testing too?

Thanks
by acsi
Mon Jan 14, 2013 1:17 am
Forum: Dragon General
Topic: Faulty Dragon32
Replies: 16
Views: 11155

Re: Faulty Dragon32

Its a 16x16k MkII issue 6
by acsi
Sun Jan 13, 2013 10:29 pm
Forum: Dragon General
Topic: Faulty Dragon32
Replies: 16
Views: 11155

Re: Faulty Dragon32

Hi OK I have checked the connections and have tried with a spare SN74LS783N and get the same result. Also I made a mistake before and I am getting sound. The display pulsates between these two screens staying on each for around a second. http://i1071.photobucket.com/albums/u507/acsidental/IMG_0414_z...
by acsi
Sat Jan 12, 2013 12:48 pm
Forum: Dragon General
Topic: Faulty Dragon32
Replies: 16
Views: 11155

Faulty Dragon32

Hi, I have a faulty Dragon 32. It is displaying colums of @ characters and flashes between this and a totally scrambled screen. I have replaced the ram chips, IC16 and IC19 but still get the same results. The MOTOR ON and MOTOR OFF commands active the relay so something must be working. However soun...