[Coco] [OT] TRS-80 Model I on DE1

[Mark McDougall]

On 20/02/2014 4:34 PM, nickma2 at optusnet.com.au wrote:

> Nick bows before the God they call... "Markus"! Â Â  :)

Oh, hardly, especially in light of my bumbling attempts the last few nights! ;)

OK, working TRS-80 Model 1 and Coco 1/2 both with SD card here:

<http://members.iinet.net.au/~msmcdoug/pace/so/de1/>

The Coco comes with a 'sample' SD card image. You'll need a 128MB (or 
larger) SD card and something like 'dd' or vcc's 'sideutil' to write to it. 
It's full of software (from memory I wrote a script that injected lots of 
disk images from a particular archive onto it) and didn't compress well so 
it's rather large.

You'll need to program the supplied HDBDOS image at $0000 in the DE1 flash. 
And for some reason I still can't fathom, despite the documentation you need 
to set SW4 to 'ON', which sets the CART# autoexec, in order for the system 
to recognise the DOS.

Oh and ignore the OS9 boot menu stuff; that was for Gary's Coco3FPGA (select 
<H>). I've been meaning to install OS9 Level1 onto it, and might do that in 
the next few days if I can work out how to now that the SuperDriver has been 
released (thanks again Boisy), so I might be able to update the SD card 
image with OS9L1 soon.

The documentation is mostly up-to-date, but some aspects are still WIP (like 
MPI, which I had to back out to get HDBDOS to work). So if the doco says 
something that looks wrong, ping me!

Apologies but I'm not actively maintaining this atm. The reason I stopped 
short of releasing this to the public a few years ago is that the SD is 
READ-ONLY! I repeat, the SD is READ-ONLY! Please Treat this as an ALPHA 
release, for your amusement only!

Long term plans were to add SD WRITE, a new cycle-accurate 6809/6309 core 
with h/w debugging (which is actually WIP), and Coco3 support. Then Coco4. 
Roughly in that order. But I've been diverted onto another project (which 
I've raved about before) that will ultimately allow me to prototype all of 
the above much, much easier!

Regards,

-- 
|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"