OSI jigxaw puzzle(s)

From: Bill Sudbrink <bill_at_chipware.com>
Date: Sat Jul 17 18:10:42 1999

Sorry, it turned out to be this evening instead of
this morning... Anyway, here are the important
bits to get the 600 (Superboard II) going:

J2 (to the left rear as you are looking down on the
board with the keyboard toward you):
  Pin 7: casette out (to tape player mic in)
  Pin 8: casette ground for both casette in and out
  Pin 9: casette out (to tape player AUX in) (same as pin 7
            except pin 7 has an additional 10K resistor in series)
  Pin 10: casette in (to tape player headphone out)
  Pin 11: video ground
  Pin 12: video signal

  (Other J2 pins are either no connect or are used for
   serial port implementations. These are not populated
   at the factory and don't look like they are populated
   on your 600)

J3 (to the right of J2) gives TTL level access straight to the
USART and is not normally used.

J4 (to the left of the keyboard) gives you access to the square
wave generator circuit (not factory populated) and to part of the
keyboard logic (I guess to attach a non-analog joystick or
a numeric keypad).

J1 (the 40 pin DIP socket just above the keyboard to the right)
provides access to all address and data lines and some 6502
signals)

The board wants +5 volts usually attached at the back right
side to one of the pads labeled with a +.

The ROM code wants all caps as input, so make sure your
SHIFT LOCK key is down. If everything is working, when you
power up, you will get a screen of garbage. Don't panic.
Press the BREAK key. The screen should clear and you should
get a prompt like:

D/C/W/M?

Press C (again, case matters). Just press return if it asks for
screen width or memory size. You should then be in the BASIC
in ROM.

That should get you started,
Bill
Received on Sat Jul 17 1999 - 18:10:42 BST