Model T System bus

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The system bus differs on the different models but are very close electrical wise.

The M100 has a 40-pin DIP socket while M102 and T200 have a 20x2 (2.54mm/0.1") pin array.

The different pin arrangements cause the pins of the 100 to be numbered differently to the 102/200.

100102200
1VDDVDDVDD
2GNDVDDVDD
3AD0GNDGND
4AD2GNDGND
5AD4AD0AD0
6AD6AD1AD1
7A8AD2AD2
8A10AD3AD3
9A12AD4AD4
10A14AD5AD5
11GNDAD6AD6
12/RDAD7AD7
13IO/MA8A8
14ALEA9A9
15CLKA10A10
16/AA11A11
17INTRA12A12
18GNDA13A13
19RAMRSTA14A14
20NCA15A15
21NCGNDGND
22NCGNDGND
23GND/RD/RD
24INTA/WR/WR
25/RSTIO/MIO/M
26/YOS0S0
27S1/ALEALE
28S0S1S1
29/WRCLKCLK
30GNDY0/IOCONT
31A15/AE
32A13/RESETRESET
33A11INTRINTR
34A9INTA/INTA
35DA7GNDGND
36DA5GNDGND
37DA3/RAMRST/RAMRST
38DA1NCNC
39GNDNCNC
40VCCNCNC