7 Jan
2018
7 Jan
'18
10:46 p.m.
Thanks Lyle.
My biggest impediment at the moment is not actually having a PC that has a floppy
drive. :-o
The other is time?work has been crazy as indicated by Jensen?s CES keynote
tonight where the chip that I?ve been working on was just announced! yea!
9,000,000,000 transistors!
TTFN - Guy
On Jan 7, 2018, at 10:33 PM, Lyle Bickley <lbickley
at bickleywest.com> wrote:
Hi Guy,
I just copied several IBM 8" Maintenance Device (MD) Diskettes - and
verified that the copies work on the IBM MD. They seem to be in an IBM
3x0 format (with a standard IBM VTOC).
Track 0 on the diskettes is 128 byte sectors,
Tracks 1 through 76 are 256 byte sectors.
The diskettes are DSSD.
(So you need a Shugart 850/851 (or equivalent) to make the copies).
I used both Teledisk and IMD - and both successfully captured and
re-created the diskettes correctly.
More in editing IBM images later...
Cheers,
Lyle
On Fri, 5 Jan 2018 11:52:56 -0800
Guy Sotomayor via cctalk <cctalk at classiccmp.org> wrote:
Hi,
I now have a number of uCode diskettes for my IBM 4331. I would
somehow like to image them so: a) I have backups in case the floppies
themselves go bad b) be able to investigate their contents in case I
have to ?merge? the contents of multiple floppies to make a single
good one
These are all 8? diskettes.
The complicating factors in all of this are:
a) any text (e.g. strings) are going to be in EBCDIC rather than ASCII
b) each uCode diskette was presumably serialized to the CPU it was for
c) not sure what the ?on-disk? structure looks like
d) the only 8? diskette drives that I have are in IBM (non-PC)
equipment
Any ideas/comments would be welcome.
Thanks.
TTFN - Guy
--
73 AF6WS
Bickley Consulting West Inc.
http://bickleywest.com
"Black holes are where God is dividing by zero"