Another oddball Pro/350 document

[Paul Flo Williams]

On Wed, 6 Oct 2021 21:54:30 -0400
Chris Zach via cctalk <cctalk at classiccmp.org> wrote:

> I have another odd preliminary document: Guide to writing a P/OS I/O 
> Driver and advanced programming notes. Order AA-BT73A-TH
> 
> Is there a copy on the net somewhere, or is this another unique
> oddball I should scan?

This is superseded by AA-BT73B-TH, which is at Bitsavers.