Interesting, but nonetheless incredibly timewasting
and pointless idea: get an old XT clone with the BIOS
and the 4 blank sockets for BASIC. Write a BIOS
extension chipset in 4 2716's or less. This would be a
great deal of work, though.
You can do this same sort of thing even today if you
have a junky (or not)network card with the net boot
EPROM socket (almost always a 2716/32/64 or similar).
The code doesn't have to have anything to do with a
network. I actually did something like this many years
ago when I wrote a password protection EPROM for my
XT, unfortunately, I don't have the code anymore, but
as I recall the first two bytes have to be 0x55 0xAA
or something similar, and the chip must checksum to 0.
I wrote the code in assembler, reserved a byte for the
checksum, and wrote a BASIC program (no laughing,
please) to calc the checksum and drop it into the
image.
--- Richard Erlacher <edick_at_idcomm.com> wrote:
> Why not just build a PROM card? I will happily send
> you a blank card with
> some decoding logic, buffers, and enough wire-wrap
> space for an EPROM or two
> for the cost of postage.
>
> Dick
>
> ----- Original Message -----
> From: "Bob Shannon" <bshannon_at_tiac.net>
> To: <classiccmp_at_classiccmp.org>
> Sent: Tuesday, April 09, 2002 6:23 PM
> Subject: Re: Native CP/M
>
>
> > I second the request!
> >
> > I'd love to get a BIOS for my Imsai, but its a
> project for another day. A
> > decent CP/M package would be a great start, but
> I'd also need some tiny
> monitor
> > to get code into the Imsai.
> >
> > I doubt this is a job for the front panel...
> >
> > Don Caprio wrote:
> >
> > > I'm trying to build a development platform for
> my Imsai. I've tried
> various
> > > CP/M emulators but haven't found one I like yet.
> > >
> > > Has anyone sucessfully run CP/M on a PC without
> running under dos and/or
> > > windows?
> > >
> > > Thanks.
> >
> >
>
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Received on Wed Apr 10 2002 - 00:13:50 BST