| Early Z88 Models - with the connector | |
|---|---|
| Z88 connector with flap removed | Z88 connector with flap in place |
 |  |
| Later and Current Z88 Models - without the Connector | |
| Z88 connector with PCB connector pads tinned (no gold). | The Z88 case moulding is changed - no flap. |
 |  |
To our knowledge, this was never used with any external device. Earlier models had a removable flap to expose the standard 2.54mm double sided gold plated 48 pins male connector that presented all the Z80 bus signals.
On later models, when it was discovered that using this connector caused the Z88 to be unstable, the flap was sealed made part of the case and the connector was pads on the PCB were tinned, no longer gold plated.
Component P C B
Side A Edge Side B
GND 1 SNSL see below
A11 2 +12v
A12 3 A10
A13 4 A9
A14 5 A8
A15 6 A7
clock 7 A6
D4 8 A5
D3 9 A4
D5 10 A3
D6 11 A2
VCC 12 A1
D2 13 A0
GND 14 GND
D0 15 D7
D1 16 M1L
INTL 17 FLP (flap switch)
slot 18 slot
HALTL 19 NMIL
MREQL 20 WRL
IORQL 21 RDL
MAWL 22 RESETL Resets Z88 (2 pulses required)
-BT 23 SVCC 5.4v while the machine is 'on.'
GND 24 SNSL
...