[Coco] NitrOS9 running on multicomp

[Neal Crook]

Booted for the first time last night after getting the "final" bug out of
my serial driver.

https://github.com/nealcrook/multicomp6809/blob/master/photos/re_20151003_multicomp_nitros_boot.jpg

The hardware is the 6809 flavour of Grant Searle's "multicomp" FPGA-based
computer, along with a new logic block that supports a 50Hz timer interrupt
and a coco-compatible memory mapper (which is not currently in use, since
this is only a level 1 port).

The boot image is a standard floppy disk image file, slopped onto an SDcard
at a Known offset and accessed by the disk device driver accordingly. This
crude but effective technique allows the SDcard to hold multiple disk
images - it actually holds images for multiple OS and bits of software
(photos below).

I also have a version of the FPGA project set up for James Moxham's Cyclone
II PCB daughtercard (Kip Koon has that one up and running with all my older
ports)

Neal.


https://github.com/nealcrook/multicomp6809/blob/master/photos/re_20150429_multicomp.jpg

https://github.com/nealcrook/multicomp6809/blob/master/photos/re_20150429_multicomp_cubix.jpg

https://github.com/nealcrook/multicomp6809/blob/master/photos/re_20150509_multicomp_basic.jpg

https://github.com/nealcrook/multicomp6809/blob/master/photos/re_20150509_camelforth.jpg

also running FLEX but I don't seem to have a photo of that.