30 May
2000
30 May
'00
3:08 p.m.
Yes, and what several vendors recommended so their
"dumb" loader prom would
work with DD media was to write the boot tracks in SD. Unfortunately I
never found one that provided a utility to do that for you, so I had to
create my own formatter with which to do that. It always bothered me to
take that approach, so I ultimately fixed my CCS box to do it "correctly" in
my view. With a 4 MHz processor it was no problem to transfer either single
or double density. The DMA was only needed if you ran a slower CPU.
Well, within some unixes this was fairly common and the default
formating utils would do the trick... Side 0 / Track 0 has been
done in SD, while the rest was DD.
Nice history fact:
The SIEMENS PC-D, a 186 DOS machine, was due the boot ROM
still able to boot a SD DOS floppy _and_ the BIOS did
support DOS disks with T/S 0/0 as SD... I never found a
disk using this feature other than a special diagnostics
disk made to test it...
Gruss
H.
--
VCF Europa 2.0 am 28./29. April 2001 in Muenchen
http://www.vintage.org/vcfe
http://www.homecomputer.de/vcfe