13 Mar
2008
13 Mar
'08
1:27 p.m.
This is the only board in the board bay, and it's
in the top slot. The
Very interesting.
The older Facit 4070s (including all the ones I've every worked on) have
a pounch cotnrol/PSU board in the top slot. It has a parallel interface.
The interface connnections are wired to one side of the bottom edge
connector, the other side of that connector is wired to the DB25 socket
on the back of the machine. Normally there's a bridging board in that
lower connector, so you get he parallel interfavce brought out there, but
Facit also made an RS232 board (which is, of course, used along with the
control/PSU board) that went in there, some other companies made custom
boards for their own interfaces (HP was one such).
If yuor RS23 board is the only one in the machine, then it must drive the
punch solenoids and the stepper motor directly. That would explain all
the power transistors on said board.
unit will feed tape, raw, with feed holes, or with
lace holes, so it's
at least somewhat alive.
And I've had another thought. With the units I'm familiar with, the
'Code Holes' button can be set to punch any character on the tape. 'Lace
Holes' (0xFF) is the common one, but there are links on the cotnrol board
to set it. I remember there being 8 unknown links on your comined
interface/control board, maybe they have that function.
-tony