26 Apr
2002
26 Apr
'02
9:42 p.m.
Yesterday I was lucky enough to pick up an IBM 5150 at Purdue Salvage for
$0 (just before it hit the trash). After a bit of playing with it, and
trying a SVGA card with it (it had no video card in it when I got it, I'm
suprised the 16bit card works OK in an 8bit slot), I've gotten it to boot
into MS-DOS 5 (ick) and CP/M-86.
I now seem to have a problem with its second floppy drive... When I try
reading from any disk, I get a "Data error" in CP/M and DOS. I think that
the problem is the head not moving... I can 'format' a disk in CP/M in the
drive, but I don't hear the disk head seeking. These are IBM branded DSDD
(full height 5-1/4") floppy drives.
Does anyone have any info I can use to try and debug (and hopefully fix)
this problem?
-- Pat
10:31 a.m.
Pat Finnegan wrote:
Other than memory cards, quite a few of the 16bit boards from
the mid 1980's will work in an 8bit ISA slot, either by changing a
jumper or through the board autodetecting the slot type. Western
Digital / Paradise chipset VGA boards are known for this.
Jeff
--
Home of the TRS-80 Model 2000 FAQ File
http://www.cchaven.com
http://www.geocities.com/siliconvalley/lakes/6757
I'm
suprised the 16bit card works OK in an 8bit slot).....
Some of them can do that. I have a 16-bit ISA VGA card from Western
Digital that will do it too. 
10:57 a.m.
Intel made a line of EthernetExpress NIC's that would autodetect slot
type and autoconfigure for 8/16 bit slots. I'm using one in my Tandy
1000SX that's connected to the internet.
James
Jeff Hellige wrote:
Pat Finnegan
wrote:
Other than memory cards, quite a few of the 16bit boards from the
mid 1980's will work in an 8bit ISA slot, either by changing a jumper
or through the board autodetecting the slot type. Western Digital /
Paradise chipset VGA boards are known for this.
Jeff I'm
suprised the 16bit card works OK in an 8bit slot).....
Some of them can do that. I have a 16-bit ISA VGA card from Western
Digital that will do it too. 
12:25 p.m.
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1:30 p.m.
On Sat, 27 Apr 2002, Tony Duell wrote:
Re-seated those connecters a few times, with no results. However, after
swapping the two drives, I got them both working again. I'm thinking I
should replace that ribbon cable as soon as I get a chance... but I'm just
happy to have both drives working again. :)
I now seem to
have a problem with its second floppy drive... When I try
Does anyone have any info I can use to try and debug (and hopefully fix)
A few simple things to check first :
1) Check the cables at the back of the second drive (34 way ribbon on an
edge connector, 4 way power connector). Make sure they're both firmly in
place. As a general point, it helps on questions like this if
you give us some
idea as to the test gear and experience you have. There's little point in
me digging out the schematics (and I do have them) for this machine and
saying 'check the waveform at pin <foo> of IC <bar>' if you don't
have a
logic analyser or 'scope and wouldn't know how to use one if you did.
Likewise there's little point in me saying 'make sure the disk is in the
right way up' if you've already got a 'scope connected and can tell me
that you're missing one of the stepper motor drive waveforms or something.
For future reference, I'm pretty knowedgeable about electronic hardware,
have a 10MHz scope and other 'basic' tools, and the common sense to put
the disk in right-side-up (well, most of the time anyways :).
-- Pat
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ard＠p850ug1.demon.co.uk -
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jrice＠texoma.net -
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