RE: info cpm board for cbm 8032

From: Didier Derny <>
Date: Sat, 17 Sep 2011 10:26:38 +0200
Message-ID: <001101cc7513$857c3540$90749fc0$@org>

Only one 4040 floppy disk ?

I remember that I had 2 8050 floppy disks.

One was used to load the cbm 8032 with the cbm software  (mix of basic and
And then the second one with cp/m


-----Message d'origine-----
De :
[] De la part de Mike Naberezny
Envoyé : vendredi 16 septembre 2011 04:13
À :
Objet : Re: info cpm board for cbm 8032

Hi Ruud & Didier,

On 8/10/11 12:42 PM, wrote:
> Is it possible to say what belongs in the smaller empty socket? I
> must be a ROM because there isn't one on the board But OTOH the
> pinout is weird, certainly not like any (EP)ROM I know.

Some mysteries of the CP/M board are now solved.  Didier was correct, the 
empty socket is for an AM9511A math coprocessor.

Recently an 8032 sold on eBay USA and the buyer found a Z-RAM board inside. 
He found my page on the board with Google and contacted me.  He had the
and sent me photocopies of it.  He did not have the disk.

The buyer said the seller also sold an 8050 drive, so I contacted that buyer

as well.  He received a handful of disks with the drive.  Luckily, the CP/M 
boot disk was one of them and he sent it to me.

I've scanned the manual and made a disk image:

This is an interesting board.  It functions as a configurable 64K RAM
for the PET, similar in ways to the 8096 board.  To run CP/M, the PET loads 
CP/M into the expansion RAM and then switches on the Z80.  The expansion RAM

is then only accessible to the Z80.  The board adds a 6520 PIA to the PET 
memory map and a special terminal program communicates with the Z80 side 
through I/O lines.


Mike Naberezny (

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