Casio PB-2000C ROM Modules

[blackjetrock]

Hi,

I've finally got enough parts together to attempt a ROM module for my Casio PB-2000C, as mentioned in this thread:

http://www.hpmuseum.org/cgi-sys/cgiwrap/...ead=215778

I have the service manual, but there's a few problems:

1. The service manual indicates a pin 46, but Diego mentions a 45 pin connector
2. The exact size of the module and the orientation of the pins isn't in the service manual
3. I was wondering what the CO pin was wired to (pin 44).

I've had a go at disassembling the PB2000C but it's not easy to get to the ROM connector and I don't want to damage my one example of this machine. I may create an extender board so I can get a scope onto the pins, there's not a lot of room in that slot.

I think you can see where I'm going with this...

Diego, would you (or anyone else who's done this) be kind enough to elaborate on your DIY ROM module?

Regards

Andrew

[xerxes]

Hi Andrew,

Diego is right with the 45 pins. I assume a oversight in the service manual. You will find some useful information
about the PB-2000C hardware at http://www.pisi.com.pl/piotr433/pb2000he.htm like this:

Code:

  01 - VSS        16 - IO5        31 - A17
  02 - A12        17 - IO6        32 - GND
  03 - A7         18 - IO7        33 - ROM3
  04 - A6         19 - GND        34 - GND
  05 - A5         20 - ROM2       35 - GND
  06 - A4         21 - A10        36 - NC
  07 - A3         22 - RD         37 - NC
  08 - A2         23 - A11        38 - NC
  09 - A1         24 - A9         39 - NC
  10 - A0         25 - A8         40 - NC
  11 - IO0        26 - A13        41 - NC
  12 - IO1        27 - WR         42 - NC
  13 - IO2        28 - A14        43 - NC
  14 - IO3        29 - A15        44 - P1
  15 - IO4        30 - A16        45 - GND

pin 20 - ROM2 chip enable (gate array pin 3)
pin 33 - ROM3 chip enable (gate array pin 4)
pin 44 - microprocessor port P1, senses the card presence, connected to VSS inside the card

The connector of the PB-2000C ROM cards is identical to the "IC ROM cards" for the CASIO Digital Diary series.
http://casio.ledudu.com/pockets.asp?lg=eng&serie=810