19 Jan
2017
19 Jan
'17
3:55 p.m.
On Thu, Jan 19, 2017 at 1:18 PM, Marc Howard <cramcram at gmail.com> wrote:
Speaking of the LA-180 has anyone noticed the note in
the PDP8A manual:
"The General-Purpose Parallel I/O on the D etch revision
of the M8316 module can be used as an interface for the
LA 180. Data to the LA I80 must be supplied in com-
plemented form. The IOTs are different from the LA8
interface designed for the LA 180. A BC80-A cable, avail-
able from DIGITAL, must be used to connect the General-
Purpose Parallel I/O to the LA 180.
Does OS8 know how to handle this way of interfacing a printer?
LPSV.PA has a compile time switch for LA180 and it includes a
complement before and after the character is written to the printer
buffer. I believe that some versions of SET have the capability of
modifying LPSV.BN to work with the LA180 at runtime. It is also
possible to use SET to modify the instructions directly.
Interestingly, the LPSV handler only contains two printer IOTs: one to
write the character and one to check the printer flag.
-chuck