Hard-sectored 5.25" disks

From: Doug Spence <ds_spenc_at_alcor.concordia.ca>
Date: Sun Mar 28 05:34:32 1999

On Mon, 22 Mar 1999, Tony Duell wrote:

> > There's an "AMI S2350P", and an "AMI S1062P", and an "AM9517A-4PC", an
> Got it!
> The 2350 is a USRT. And it just happens to be one that was used in some
> hard sectored disk controllers - like the H17 card I have schematics of
> here...
> It does sound like it's expecting hard sectored disks. The chip could be
> used for a synchronous serial port (of course), but I think that's unlikely.

OK. That's cool! I've never owned a machine that needed hard sectored
disks before. How exotic! ;)

Maybe next month I'll drag home something with an 8" drive. :)

> I don't recognise the 1062, the 9517 is (IIRC) a DMA controller.


> > "SY2128-1", a "FERRANTI ZN 1066E", three PIO chips, two CTC chips, a Z80,
> The 2128 is (IIRC) a smallish RAM (2K*8), possibly video memory

The 2128 is quite close to the 4650, so you're probably right.

> I don't recognise the ZN1066 number, but I can try to look it up.

I'm sure it has nothing to do with the floppy drives. Actually, I think
it was on the power supply board(!) so I'm not sure why I mentioned it. :)

> > and a Hitachi HD46505SP. Oh, and three ROMs or EPROMs.
> 4650 is a CRT controller IIRC.

Yes, in case it was dead I pulled another 4650 off a PC video card and
tried it out, but there was no change.

> -tony

Doug Spence
Received on Sun Mar 28 1999 - 05:34:32 BST

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