Search found 86 matches

by bluearcus
Sat Nov 02, 2019 2:01 am
Forum: Dragon General
Topic: MAME Emulation
Replies: 95
Views: 47234

Re: MAME Emulation

Yeah, that does look pretty much OK, perhaps it's not directly related to a doublesided format as I'd assumed, Something must be amiss though to explain the Xroar vs Mame discrepancy in behaviour.
by bluearcus
Thu Oct 31, 2019 6:10 pm
Forum: Dragon General
Topic: MAME Emulation
Replies: 95
Views: 47234

Re: MAME Emulation - 80 track and double sided

It appears that Mame Dragon disk drive emulation is broken for some non-standard disk formats as well. Soren's 80 track OS9 system disk image (.VDK) works great on Xroar. https://www.roug.org/retrocomputing/os/os9 But it fails to get past loading the boot track on Mame. Most likely because double si...
by bluearcus
Tue Jun 04, 2019 12:15 am
Forum: Uploads
Topic: CAD (1985)(Voltmace)
Replies: 5
Views: 2602

Re: CAD (1985)(Voltmace)

Uses a 6821 to interface the 14B multibutton voltmace joystick...

https://www.facebook.com/groups/dragon3 ... 985205629/
by bluearcus
Thu Feb 14, 2019 11:46 pm
Forum: Dragon General
Topic: 200E ROMs
Replies: 11
Views: 4864

Re: 200E ROMs

A bit of disassembly of the ROMs and then some searching on here... CLS 9 switches the G0 value in text mode and determines whether character set 0 or 1 from the ROM is used. It stores details of the mode setting in bit 4 in zero page $77. This isn't switching INT/EXT character set. Sixxie and co al...
by bluearcus
Mon Feb 11, 2019 2:19 pm
Forum: Hints and Tips
Topic: Can just ONE byte be read from disk?
Replies: 6
Views: 4130

Re: Can just ONE byte be read from disk?

Have a look at the DOS command. I think this does a two byte read, to check for the presence of the boot track signature. So a one byte read, or any other number should be possible, assuming you only want to start at the beginning of the sector. I don't think the disk controller is able to allow pre...
by bluearcus
Wed Feb 06, 2019 2:40 pm
Forum: Software Requests
Topic: Looking for a terminal program
Replies: 28
Views: 17381

Telepost Systems Terminal Simulator

I unbundled Telepost System's Terminal Simulator cartridge for the Dragon 64 into just an ordinary OS9 application that can be run from disk. It's here: http://archive.worldofdragon.org/phpBB3/viewtopic.php?f=5&t=5781 The original ROM cartridge image is attached. I can't locate it in the Archive, so...
by bluearcus
Wed Feb 06, 2019 1:44 am
Forum: Dragon General
Topic: Dragon 'Terminal Simulator' for OS9
Replies: 2
Views: 2355

Dragon 'Terminal Simulator' for OS9

Here's something I've been meaning to post for a while. Duncan Smeed brought a little bare cartridge board along to the Dragon meet last year which when plugged into a machine booted straight Telepost Systems 'Terminal Simulator'. A little inspection of this program suggested the cartridge was on OS...
by bluearcus
Wed Feb 06, 2019 12:42 am
Forum: Dragon General
Topic: 80 Column OS/9 Software for the DragonPlus ...
Replies: 18
Views: 8403

Re: 80 Column OS/9 Software for the DragonPlus ...

Here's a version of the minted WYSIWYG editor which I hacked together for the 80 column DragonPlus screen driver...

I had a copy of this running briefly on Tony's DragonPlus machine at the Dragon meetup last year, but I don't think I posted it anywhere.
by bluearcus
Mon Nov 05, 2018 1:07 am
Forum: Dragon General
Topic: Faulty Dual Floppy Disc Drive - Repair?
Replies: 8
Views: 3419

Re: Faulty Dual Floppy Disc Drive - Repair?

Hi Patrick, If you are hoping to back your disks up to modern PCs and disk images which can be loaded in an emulator, or from which files can be extracted into modern PCs using other tools, then it sounds like Drivewire is probably the way to go, in terms of minimal setup. You'll need a cable, which...
by bluearcus
Sat Nov 03, 2018 2:30 pm
Forum: Dragon General
Topic: Faulty Dual Floppy Disc Drive - Repair?
Replies: 8
Views: 3419

Re: Faulty Dual Floppy Disc Drive - Repair?

Hi Casper, There are a bunch of possible issues, from power supply, dead drive board, seized motors or other mechanics, to floppy controller calibration. Are you on the Dragon Facebook group? It's a bit more active and might help find someone local who can help... BBC disk drives are a good source o...