5 Jan
2002
5 Jan
'02
12:40 p.m.
On Sat, 5 Jan 2002, Tony Duell wrote:
I've worked on Tandy 8 bit machines since the
model 1. I've got
schematics of the M1 expansion interface. M1 'pregnant cable' printer
interface, M3, M4, M100, etc to hand.
And I can't think of one machine that used a '4 bit interface'. They all
have the conventional 8 data lines, strobe, and busy. Tandy did do some
unconventional things with the other, lesser used, handshake lines at one
point, but I've used non-Tandy printers with the M1, M4 and M100 with no
problems.
What machine and/or printer are you thinking of?
I was referring to bi-directional parallel communication on a model 1000.
This is most often needed for laser printers and most newer printers.
Rather than duplicate the information someone else has already documented,
I'll just provide a link: http://www.oldskool.org/~tvdog/1kfaq.html#II.H.5
-Toth