6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Mon Oct 8 11:27:37 2001

> > IIRC, RS used pin 32 as drive select 3 (the fourth drive), although most
> > everyone else used it as side select for double sided drives. Since RS
> > used "missing pins in the cable" for drive select, and shorted pins
> > 10,12,14, and 32 together on each drive, ...
> > If you used aftermarket stuff, it was no big deal. But if you used almost
> > all RS stuff, then it would require a jumper wire on the controller to
> > connect side select instead of DS3 to pin 32, a non RS cable, NOT using 4
> > drives on the cable, and cutting traces on all RS drives on that cable to
> > do drive select at the drive instead of in the cable (at least for DS3)

On Sun, 7 Oct 2001, Eric Dittman wrote:
> This was only on the Model I. The Model III and 4 didn't have this problem.

Not for INTERNAL drives. But the drives sold by RS for EXTERNAL use for
model 3, etc. were the same drives, with the same perverted jumpers. If
you were to use RS cable, and/or include a RS drive along with a DS one on
an external cable, then you DID have to deal with them shorting side
select to DS in the RS drives.

'Course, if you stuck with aftermarket drives, and used NORMAL drive
select, didn't put 4 drives external, and avoided RS's demented cables,
then it wasn't a problem.

Grumpy Ol' Fred        cisin_at_xenosoft.com
Received on Mon Oct 08 2001 - 11:27:37 BST

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