Search found 42 matches

by Yoruk
Wed Jul 29, 2020 5:59 pm
Forum: Dragon Hardware
Topic: Dragon memory map
Replies: 9
Views: 4460

Re: Dragon memory map

That's make sense. And yes for a simple cart we don't need it.

Thanks !
by Yoruk
Fri Jul 24, 2020 7:41 am
Forum: Dragon Hardware
Topic: Dragon memory map
Replies: 9
Views: 4460

Re: Dragon memory map

Thanks guys ! I'll study this.
by Yoruk
Wed Jul 08, 2020 9:08 am
Forum: Dragon Hardware
Topic: Dragon memory map
Replies: 9
Views: 4460

Re: Dragon memory map

Thanks !

You confirm that the CoCo cartridge pinout is the same than the Dragon one ?
by Yoruk
Wed Jul 08, 2020 6:44 am
Forum: Dragon Hardware
Topic: Dragon memory map
Replies: 9
Views: 4460

Re: Dragon memory map

Thanks. $C000-$FEFF make sense, I'll retro-analyze a cartridge pcb to see if the IC are working in this area. But maybe I'm missing something but I don't have any 'R2' signal on my cartridges pinout. Is the Dragon pinout similar to the CoCo one ? I do have a /CTS ("Cartridge select signal") witch is...
by Yoruk
Tue Jul 07, 2020 2:31 pm
Forum: Dragon Hardware
Topic: Diagnostic Cartridge
Replies: 4
Views: 3385

Re: Diagnostic Cartridge

I have cartridges pcb layout available in EagleCad, I can design a custom version to fit this rom if needed. :)
by Yoruk
Tue Jul 07, 2020 12:24 pm
Forum: Dragon Hardware
Topic: Dragon memory map
Replies: 9
Views: 4460

Dragon memory map

Hello there, For learning purposes, I'm working on a custom 2*4k cartridge using standard 2732 eeproms. I have issues finding the exact memory map for the cartridge. In a manual I found a cartridge between $C000 and $FEFF, here it is $C000-$FF00 ("Cartridge ROM or DOS ROM") and also $8000 - $FF00 ("...
by Yoruk
Sun Oct 29, 2017 1:35 pm
Forum: Dragon General
Topic: dragon 32 secam psu
Replies: 13
Views: 4316

Re: dragon 32 secam psu

Have you tried to follow the continuity of the input signal from the tape connector to the internal components ? Reading the schematics can help you a lot...
by Yoruk
Sun Oct 29, 2017 8:19 am
Forum: Dragon General
Topic: dragon 32 secam psu
Replies: 13
Views: 4316

Re: dragon 32 secam psu

What is your source of sound ? A tape reader ? A computer ?
by Yoruk
Sat Oct 28, 2017 8:12 pm
Forum: Dragon General
Topic: New hardware - Tape reader emulator
Replies: 0
Views: 2184

New hardware - Tape reader emulator

Hello everybody, Today I'll talk about a new hardware device for our old computers : a tape-reader emulator, the SD-LEP. This project was created by a french guy initially for the Thomson french serie of computers, but the project works with a wide variety of computers. I tried it with my Dragon 32,...
by Yoruk
Sat Oct 28, 2017 7:56 pm
Forum: Dragon General
Topic: dragon 32 secam psu
Replies: 13
Views: 4316

Re: dragon 32 secam psu

Some pictures of my machine are available from this topic :

viewtopic.php?f=5&t=5561

If you are interested by more beautiful pictures, I can take some better ones if you want to share or upload them.