18 Sep
2007
18 Sep
'07
7:49 p.m.
On Monday 17 September 2007 18:57, Tony Duell wrote:
U
My machine is clearly not a Cromemco anything. The cases (separate box
for the drives), PSUs, backplane and some of the boards are made by CASU
in the UK
But yes, my Persci drive is a dual-disk unit. 4 heads on a voice coil
positioner. And motors to eject the disks.
When I
think about it, the MITS 8800 had connector punchouts for DB25
*only* in the back panel. DB25 seemed to be the lingua franca back
then for hobbyist interfaces. If one had an 8" floppy drive, one ran
the ribbon cable right through the crack between the back panel and
the case cover directly to the controller card(s). No DD50s.
I have an S100 amchine called a CASU Super C. It contains a Cromemco CP= board, some other stnadard 64K RAM bvoard, a
Micromation Doubler disk
controller and CASU-designed boot ROM and seiral interface boards.
The disk drive (a Persci) is in a separate box. The 50 wire interface
cable is split down the middle adn connected to a pair of DB25s...
I have a Cromemco "System 3" (?). It also has a Persci drive in it, a d=
ual. =20
Is that what yours is? There's apparently some sort of a problem with
mine, as the floppy which=
was=20
in it when I got it had been tried so much and for so long that the initi=
al=20
tracks were completely worn away, and you could see through it.
On perusing the service data for it, I notice that the drive uses a bunc=
h of=20
_incandescent_ light bulbs for things like index sensor, etc. I would=20
imagine that one or more of these is likely to be the problem.
Possibly. Typically with a problem like this I hook up the drive
exerciser and see just what the drive is, and isn't, doing.
-tony