Date:   2005-02-15
Author: Rainer Buchty (rainer@buchty.net)

I recently acquired a used VZ10m, and since noone did it so far, I grabbed a multimeter to check out the cartridge slot pinning. The external VZ cartridge slot(*) has 45 pins where 45 is the leftmost pin if you face the machine from front; it is mapped to 34 internal pins as follows:

(*) Connector type: JAE JC20-C45PA-LT2-A2 831 (45 pins, 1mm pitch, single row)

34-pin  45-pin  Fct.            Notes
(int'l) (ext'l)
34      19,45   Vcc 
33      44      PB0             
32      35      PB1             
31      33      GND             connection via mainboard, not connected on
                                cartridge connector
30      32      CE              
29-27   39-28   RA16-14         
26      27      PB2             
25-22   27-23   RA13-10         
21      22      PB3             
20      21      RA9             
19      20      CE1             
18-11   18-11   PA7-0           
10-2    19-2    RA8-RA0         
1       1,31,34 GND

Connectors 36-43 at 45-pin connector can be jumpered to GND on the connector PCB. On my machine (and probably also all other VZs) they're left open.

Meaning of signal names:

RA0-16:  Card Address (only RA0-15 seem to be used)
PA0-PA7: Card Data (bidir.)
PB0:     Card Detect (low=card inserted)
PB1:     CS
PB2:     WE#
PB3:     OE#