HP Forums
Casio PB-2000C ROM Modules - Printable Version

+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: Not HP Calculators (/forum-7.html)
+--- Forum: Not remotely HP Calculators (/forum-9.html)
+--- Thread: Casio PB-2000C ROM Modules (/thread-8677.html)



Casio PB-2000C ROM Modules - blackjetrock - 07-12-2017 06:41 AM

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/hpmuseum/archv021.cgi?read=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


RE: Casio PB-2000C ROM Modules - xerxes - 07-18-2017 02:43 PM

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