On Wed, 6 Oct 2021 21:54:30 -0400 Chris Zach via cctalk <cctalk@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 This is superseded by AA-BT73B-TH, which is at Bitsavers.
