Re: CP/M bootable CD?


For laughs I fired up Daves, NS* emulator as a good test on a 486 with
16mb and DOS 6.22 as the OS and it all fit in the first 1mb of ram
comfortably and ran well at that. The only thing needed to do CDrom
would be the CDdriver as I used a small 100mb ide drive (98% empty).
Actualy the whole mess fit on a 3.5" floppy with several floppy
images! NS* floppy images for DD are at most 360k. It was
fully functional on an old 386/16 laptop with 2mb ram and 40mb drive.

HORISON.COM requires a single 64k segment for the emulator
code+data, and another 64k segment for the emulated system
memory. So it should run in only 128k (plus perhaps a paragraph
or two of DOS overhead).

HORIZON.COM is about 19k, and another 20k for the help file
(which you can do without) - so a 1.44M disk can hold DOS, the
emulator and a few images (esp if they are only single-sided)

Most bootable CDs create a "virtual floppy", so if you can live with
the images that you can fit on the floppy, you wouldn't need the
CD driver - if you want to be able to access literally thousands of
disk images on a CD, all you need is a hardware driver loaded
in config.sys and MSCDEX (or equivalent) loaded in autoexec.bat

HORIZON will let you mount images read-only, which makes them
look like the write-protect tab is installed (so you won't get I/O errors
by trying to write to the CD).

I've got a little IDECD.SYS driver which hasn't failed yet to recognize
an IDE CD. The ones from the W95/W98 boot/install floppies should
also be pretty generic (as they want them to work on as wide a range
of system as possible).

Regards,
Dave

--
dave06a@ Collector of classic pre-PC computer systems.
dunfield. If you have an old 8/16 bit non-PC system in need of a good
com home, please contact me at email address on the left, or
via contact link of this web site:
http://www.parse.com/~ddunfield/museum/index.html

.

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