Search found 258 matches

by prime
Wed Apr 29, 2020 10:04 pm
Forum: Dragon General
Topic: Dragon power board problems!
Replies: 9
Views: 5764

Re: Dragon power board problems!

Regarding OS9 crashing, I'm not sure if this is relevant but stock OS9 doesn't boot on upgraded D32s because it expects the D64 serial port to be present at $ff04. On a D32, OS9 ends up writing to the low pia instead and freezes the machine during boot. I think the D32 64K upgrade guide describes h...
by prime
Wed Apr 22, 2020 1:26 pm
Forum: Dragon General
Topic: Debugging a real Dragon with NoICE - serial port
Replies: 7
Views: 5224

Re: Debugging a real Dragon with NoICE - serial port

I've used the Godil based emulator, and it is indeed excellent, being able to supend the CPU and look at registers / memory / single step is
indeeed useful.

There is anew version that has a proper level translator board and a cheapish FPGA development board.

Cheers.

Phill.
by prime
Thu Mar 26, 2020 8:12 pm
Forum: Dragon General
Topic: Dragon Beta OS-9 disks
Replies: 17
Views: 9820

Re: Dragon Beta OS-9 disks

Thanks, at least I can now rule out any mis-interpretation of the floppy format. Are all discs bootable? Took another look at the driver last night, the implementation of the memory banking looks overly complicated, and is probably now broken. The memory sub-system in MAME has improved immensely si...
by prime
Thu Mar 26, 2020 1:32 am
Forum: Dragon General
Topic: Dragon Beta OS-9 disks
Replies: 17
Views: 9820

Re: Dragon Beta OS-9 disks

Who actually has these Beta OS-9 floppies? Could they be re-imaged in a more suitable format such as HFE? I have a copy of them, I can rig up a grease wezel setup and archive them at some point if you want. Yes please :) I've uploaded the zipped .scp files of the disks to : http://penguin.stats.war...
by prime
Wed Mar 25, 2020 7:03 pm
Forum: Dragon General
Topic: Dragon Beta OS-9 disks
Replies: 17
Views: 9820

Re: Dragon Beta OS-9 disks

Pernod70 wrote: Sat Mar 21, 2020 1:33 pm Who actually has these Beta OS-9 floppies? Could they be re-imaged in a more suitable format such as HFE?
I have a copy of them, I can rig up a grease wezel setup and archive them at some point if you want.

Cheers.

Phill.
by prime
Tue Mar 03, 2020 11:04 am
Forum: Dragon General
Topic: Dragon ROM souce code.
Replies: 3
Views: 3182

Dragon ROM souce code.

Hi all,

Just to let you all know I have put the dissassembled, re-assembleable and commented source for the Dragon 32 & 64 ROMS online at :

https://github.com/prime6809/DragonRom

Cheers.

Phill.
by prime
Sat Jul 27, 2019 12:14 pm
Forum: Discuss This Site
Topic: Hardware Forum Needed?
Replies: 3
Views: 5872

Re: Hardware Forum Needed?

Sounds like a good idea to me.

Cheers.

Phill.
by prime
Sat Jul 20, 2019 7:22 pm
Forum: Dragon General
Topic: Loading files into Xroar....
Replies: 9
Views: 5585

Re: Loading files into Xroar....

Just use File->Load or File->Run. XRoar recognises initial $55 (in a file with ".bin" extension) as DragonDOS and parses the header. You should then find it in memory... (FWIW, if it sees an initial $00, it tries it as a CoCo RS-DOS binary instead) Oh, and BASIC files not supported yet... Should pr...
by prime
Sat Jul 20, 2019 7:21 pm
Forum: Dragon General
Topic: Loading files into Xroar....
Replies: 9
Views: 5585

Re: Loading files into Xroar....

MAME / MESS can't load these files natively, but a version with the debugger enabled I can drop to the debugger console and use the load command to load the file at load address - header len with something like : I could easily add native support for these using the Quickload option. Can you post a...
by prime
Fri Jul 19, 2019 11:21 pm
Forum: Dragon General
Topic: Loading files into Xroar....
Replies: 9
Views: 5585

Loading files into Xroar....

Hi All, Is there a way of loading files that have a DragonDos header into Xroar....not here I don't mean from a disk image! Files in theis format are what the DragonMMC uses for files saved direct to the FAT filesystem with MLOAD / MSAVE. The format of the header is : Byte(s) Purpose $00 Start marke...