5 Mar
2007
5 Mar
'07
11:42 a.m.
On 5 Mar 2007 at 14:03, Dave Dunfield wrote:
I strongly suspect that the APC is going to require a READY\ signal.
This was the rule on 8" drives more than the exception. Most 3.5"
drives and a fair number of 5.25" 1.2MB drives can't provide one.
Depending on the way the APC views READY\ change states, you may or
may not be able to "get by" with hard jumpering the READY\ signal
TRUE.
The APC is the forerunner of the 9801, which did employ 8", 5.25" and
3.5" drives, all hosting the same format. The NEC 3.5" drives used
are 360 RPM models and are fairly difficult to obtain (if you need a
model number, I've got one). It is possible to jumper (needing a
soldering iron) some Teac FD235HF models to support 360 RPM
recording. You'll still have to provide a READY\ signal, however.
You can probably do that with a simple NE555.
The 9801 always struck me as having the most common-sense approach to
diskette support--the format is identical regardless of the physical
medium.
Cheers,
Chuck
while on the
topic, do you think a 1.2meg or 1.44meg
would work in an APC w/the proper adapter?
A 1.2M 5.25" HD floppy can be substituted for an 8" drive
in most cases - It's the same rotational speed and data rate.
I haven't looked at doing so with an APC but I would immagine
that it's possible.
A 3.5" HD will run at the right data rate, however it rotates
slower (that you you get 1.44 instead of 1.2M/disk in a PC).