Yes please
Dragon Beta OS-9 disks
Re: Dragon Beta OS-9 disks
I've uploaded the zipped .scp files of the disks to : http://penguin.stats.warwick.ac.uk/~sts ... 0Disks.zip
These can be loaded into the HxC software and processed into other formats.
Cheers.
Phill.
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 since then so should be able to simplify this and make it more readable.
Re: Dragon Beta OS-9 disks
The OS-9 ones should be, not sure about the C compiler one. We do know they do boot on the one real machine we know still exists.Pernod70 wrote: ↑Thu Mar 26, 2020 12:02 pm 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 since then so should be able to simplify this and make it more readable.
The banking prolly is more complicated than it needs to be, I was kinda learning by example from other drivers so pretty much winging it
Cheers.
Phill.
Re: Dragon Beta OS-9 disks
I've modernised most of the driver which has simplified the code by removing ~400 lines, but am still struggling to get the thing to boot Both CPU's hit a SYNC and wait forever, so I presume an interrupt issue somewhere.
Is there a documented disassembly of the boot rom anywhere?
I remember seeing some schematics for the keyboard and floppy sections, but can't find them anywhere. Were any other schematics found and are they archived anywhere?
Re: Dragon Beta OS-9 disks
See http://www.dragondata.co.uk/tech/circui ... index.html
(You have to click on the pictures, and not on the text links.)
Re: Dragon Beta OS-9 disks
Thanks, just couldn't remember where I'd seen them. I presume no others are known to exist?Alastair wrote: ↑Fri Apr 03, 2020 10:35 pmSee http://www.dragondata.co.uk/tech/circui ... index.html
(You have to click on the pictures, and not on the text links.)