Model T System bus

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.

	100	102	200
1	VDD	VDD	VDD
2	GND	VDD	VDD
3	AD0	GND	GND
4	AD2	GND	GND
5	AD4	AD0	AD0
6	AD6	AD1	AD1
7	A8	AD2	AD2
8	A10	AD3	AD3
9	A12	AD4	AD4
10	A14	AD5	AD5
11	GND	AD6	AD6
12	/RD	AD7	AD7
13	IO/M	A8	A8
14	ALE	A9	A9
15	CLK	A10	A10
16	/A	A11	A11
17	INTR	A12	A12
18	GND	A13	A13
19	RAMRST	A14	A14
20	NC	A15	A15
21	NC	GND	GND
22	NC	GND	GND
23	GND	/RD	/RD
24	INTA	/WR	/WR
25	/RST	IO/M	IO/M
26	/YO	S0	S0
27	S1	/ALE	ALE
28	S0	S1	S1
29	/WR	CLK	CLK
30	GND	Y0	/IOCONT
31	A15	/A	E
32	A13	/RESET	RESET
33	A11	INTR	INTR
34	A9	INTA	/INTA
35	DA7	GND	GND
36	DA5	GND	GND
37	DA3	/RAMRST	/RAMRST
38	DA1	NC	NC
39	GND	NC	NC
40	VCC	NC	NC