21 Mar
2010
21 Mar
'10
7:08 p.m.
PSU is indeed the same, HP-IB board is the same
02670-60072 Rev.A ROM (U15)
02670-80078, Processor (U2)8039, (U13) Empty socket.
DO you mean U13 is empty? What about U14? Is there a 2K*8 RAM (2016,
6116) on this board at all?
Printerboard 02670-60084 ROM (U101) 1818-1819,
Processor (U301) 8049
1820-2731.
Dipswitches are the same, for as far I can see the difference is U301, the
I assume the DIP swithc on the HPIB board is set differently because
your board uses an external ROM and mine doesn't.
service manual speeks of replacing one chip.
Right. Sounds like I'd better have a go at buildign a device to read out
8049s...
The interface boards seems to be field replaceble, in
my opinion it make no
sense to put the graphic rendering on the interface board.
I think it was actually user-changeaable (you could swap the interface
board if your needs changed), rather like the HP7225 plotter. You just
undo 2 screws on the back and slide the board out -- without even taking
the case cover off.
-tony