23 May
2013
23 May
'13
3:16 p.m.
All,
I'm researching into the diskette format which might have been used on a GEC 4000
series computer running OS4000. The media I'm attempting to archive is 5.25"
DSDD, and I've been through the obvious formats. I'm fairly certain it's MFM
encoded based on the bit pattern histogram.
Anyone know different / better / more?
Cheers,
Colin
23 May
23 May
3:40 p.m.
On 23/05/2013 23:16, Colin Eby wrote:
All,
I'm researching into the diskette format which might have been used on a GEC 4000
series computer running OS4000. The media I'm attempting to archive is 5.25"
DSDD, and I've been through the obvious formats. I'm fairly certain it's MFM
encoded based on the bit pattern histogram.
Anyone know different / better / more?
Cheers,
Colin
I would have expected them to be IBM format, but its so long since I
used OS4000 I have forgotten everything I knew. However I do have a copy
of "Practical X.25 Networking" which sadly doesn't help that much. It
says the GEC4065 used for an X.25 switch were 8" DSSD holding 512Kb and
that they were in "Standard OS4000 Format" so not much info there,
except perhaps that OS4000 has its own format....
I wonder if any one a Janet (www.ja.net) knows anything thing. I think
David Salmon was there when they used OS4000......
Dave Wade
G4UGM
4:03 p.m.
On Thu, 23 May 2013, Colin Eby wrote:
I'm researching into the diskette format which
might have been used on a
GEC 4000 series computer running OS4000. The media I'm attempting to
archive is 5.25" DSDD, and I've been through the obvious formats. I'm
fairly certain it's MFM encoded based on the bit pattern histogram.
Anyone know different / better / more?
I'm unsure what you mean by "been through the obvious formats".
What tools are you looking at the disks with?
4232
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4232
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cisin＠xenosoft.com -
colineby＠isallthat.com -
dave.g4ugm＠gmail.com