0x0000  optional memory (moto bus)
0x4000  pinstrip (LCD)
0x8000  adc
0xC000  rom (intel bus)


op amp supply 0 and +7.5v
adc supply +5v


AN0-3 -+- op amp, gain +0.55 ---> adc IN0-3
       |
      23k
      _|_

D25

 1    AN0
 2    AN1
 3    AN2
 4    AN3
 5    IN4  (direct)
 6    /P15 (ULN2003)
 7    /P14
 8    /P13
 9    /P12
10    /P11
11    /P10
12    /P23 (RXD but the oc inverter is backwards)
13    supply +
14-25 ground

pinstrip, top view, E4 = E and 0x4000

GND D7  D5  D3  D1  E4  AN3 -5v IN7 IN5 P17 nc  P12
GND D6  D4  D2  D0  R/W A0  +5v IN6 P13 P16 P10 P11

DIL24 (note: motorola bus)

A7   +5v
A6   A8
A5   A9
A4   R/W
A3   /E (cpu)
A2   A10
A1   zero A15 and A14
A0   D7
D0   D6
D1   D5
D2   D4
GND  D3

DIL28 jumpers

A13  e.g. 27128
Vcc  e.g. 2816 Vcc

A11  e.g. 27128
Vcc  e.g. 2816 /WE

std Hitachi LCD module (for the record)

1  Vss Vcc
   Vee RS
   RW  E
   D0  D1
   D2  D3
   D4  D5
   D6  D7  14