6 Jun
2012
6 Jun
'12
10:44 a.m.
Of my 858/859 CPU's, some are CP7R and some are
CP7RA. I don't know
what the difference between these two is. The difference between the
858 and the 859 is whether a front panel with lamps and toggle
switches is fitted (858) or a front panel with fluorescent hexadecimal
displays and pushbuttons (859).
In the P854, there are 2 RS232 serial ports on the CPU boards. I think
they use 8251 USARTs, and are controleld by the processor microcode. One
is used for the console terminal, the other commnicates with the
frontpanel, which is a keypad thing wit ha pair of VF displays. There's a
microcontrolelr (an 8748 I think) on the frontpanel board.
Is the P859 like this? Does the P858 lights-and-swithces panel
communicate over an serial link. If so, I'd love to know more....
Do you ahve nay docuemtnaion which includes eitehr the source code for
the panel micrcontrolelr firmware or the communications protocol?
-tony