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This is superseded by AA-BT73B-TH, which is at Bitsavers.