4 Feb
1998
4 Feb
'98
5:26 a.m.
I keep an 8" floppy disk in the front of my store to amaze people ("Just
fold it twice and stick it in your drive...it holds a lot!")
Just how much do (did?) they hold? (I'm sure there were different data
densities...just a range is all I want!)
manney
4 Feb
4 Feb
5:34 a.m.
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5:43 a.m.
At 11:26 2/4/98 -0500, you wrote:
I keep an 8" floppy disk in the front of my
store....
Just how much do (did?) they hold? (I'm sure there were different data
densities...just a range is all I want!)
Roughly 90K to 800K. Very roughly.
__________________________________________
Kip Crosby engine(a)chac.org
http://www.chac.org/index.html
Computer History Association of California
8:38 a.m.
Looked in my 1978 Intel catalog. It says that their iSBC 202 double density
controller is compatible with the Shugart SA 800 8" disk drive and that it
will store 77 tracks per disk, 52 saectors per track and 128 bytes per track.
Their iSBC 211 and 212 disk subsystems allow 256K per diskette.
BTW someone on this list said that Intel did not use the i prefix until
the 486 CPU came out. That's not right, I have an Intel "iAPX 86,888
User's Manual" dated 1981.
At 11:26 AM 2/4/98 -0500, you wrote:
I keep an 8" floppy disk in the front of my store
to amaze people ("Just
fold it twice and stick it in your drive...it holds a lot!")
Just how much do (did?) they hold? (I'm sure there were different data
densities...just a range is all I want!)
manney
8:53 a.m.
PG Manney wrote:
I keep an 8" floppy disk in the front of my store to amaze people ("Just
fold it twice and stick it in your drive...it holds a lot!")
Just how much do (did?) they hold? (I'm sure there were different data
densities...just a range is all I want!)
If I recall, when IBM first invented the things, they held right about
128k, single sided, single density. By the time I first dealt with them
in the TRS-80 Model 2, they were packing 512k on a single-sided disk.
Later, the Model 16/6000 Xenix systems were packing 1.25M on a double
sided disk. Shortly after that, the format died in favor of 5.25HD.
--
Ward Griffiths
Dylan: How many years must some people exist,
before they're allowed to be free?
WDG3rd: If they "must" exist until they're "allowed",
they'll never be free.
9:20 a.m.
To add further rumor to this data stream...
"Way back when" I first ran into 8 inch floppies, I *heard* the
size chosen by IBM was based upon the need for a single floppy
to be able to replace a "box" of punched cards (choose your
variety - 80 or 96). So the need was to support around 2000
"records" per disk (77 tracks * 26 sectors per track = 2002.) And
a "record" of 128 bytes could hold an entire card image with ease.
Never substantiated this rumor, but it sounded good, anyway.
Gary.
At 02:53 PM 2/4/98 -0500, you wrote:
PG Manney wrote:
I keep an 8" floppy disk in the front of my store to amaze people ("Just
fold it twice and stick it in your drive...it holds a lot!")
Just how much do (did?) they hold? (I'm sure there were different data
densities...just a range is all I want!)
If I recall, when IBM first invented the things, they held right about
128k, single sided, single density. By the time I first dealt with them
in the TRS-80 Model 2, they were packing 512k on a single-sided disk.
Later, the Model 16/6000 Xenix systems were packing 1.25M on a double
sided disk. Shortly after that, the format died in favor of 5.25HD.
--
Ward Griffiths
Dylan: How many years must some people exist,
before they're allowed to be free?
WDG3rd: If they "must" exist until they're "allowed",
they'll never be free.
9:52 a.m.
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9:11 a.m.
On Wed, 4 Feb 1998, PG Manney wrote:
I keep an 8" floppy disk in the front of my
store to amaze people ("Just
fold it twice and stick it in your drive...it holds a lot!")
Just how much do (did?) they hold? (I'm sure there were different data
densities...just a range is all I want!)
manney
In rather general terms, from 241k for SSSD to 1.2mb for DSDD.
- don
donm(a)cts.com
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Don Maslin - Keeper of the Dina-SIG CP/M System Disk Archives
Chairman, Dina-SIG of the San Diego Computer Society
Clinging tenaciously to the trailing edge of technology.
Sysop - Elephant's Graveyard (CP/M) - 619-454-8412
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see old system support at http://www.psyber.com/~tcj
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