29 Feb
2008
29 Feb
'08
9:03 p.m.
I have 4 HP-12531 cards. Two are have tabs labeled "HS TERMINAL" and 2
have labels "BUF'R'D TTY REG".
Three of cards have 307.200 Khz crystals, and one of the non-HS boards
has a 225.280 Khz crystal.
From what I read in:
http://www.bitsavers.org/pdf/hp/21xx/interfaces/12531C.pdf
and on:
http://www.cs.ubc.ca/~hilpert/e/HP21xx/io12531BCD.html
the only difference I can see between the C and the D is the crystal.
Does anyone know of another difference?
Ok, here's the big one. Anyone know where to get another 307.200 Khz
crystal? :)
--
Tim Riker - http://Rikers.org/ - TimR at Debian.org
Embedded Linux Technologist - http://eLinux.org/
BZFlag maintainer - http://BZFlag.org/ - for fun!