Re: CBM 8032P control codes

From: Marko Mäkelä (
Date: 2001-08-06 14:04:45

On Mon, 6 Aug 2001, William Levak wrote:

> I don't have any documentation that is specific to the 8023P.  It is most
> similar to the 4022P, which is a bidirectional version of the 4022.  I
> have compiled a list of control codes and secondary addresses.

I took the liberty and put the list available at

I wonder if the codes are compatible with Commodore plotters.  Were there
other plotters than the 1522 (I think that was the number)?

> The other problem was with some HP instruments that were intended to
> operate independently and report their information when they had some.
> This mode did not work at all on the PETs, as they would ignore anything
> that they had not initiated.

Oh yes, the Service ReQuest line that is also implemented on the Commodore
serial bus.  It remained unused until Commodore invented the burst mode
hack in the Commodore 128, which misuses the line for fast serial


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