Atari Parallel Bus Interface

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PBI = Parallel Bus Interface

Available on Atari 600XL & 800XL.

Pinout

1                                                                       49
o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o  o
2                                                                       50

1	GND Ground
2	~EXTSEL External Select
3	A0 CPU Address bus line
4	A1 CPU Address bus line
5	A2 CPU Address bus line
6	A3 CPU Address bus line
7	A4 CPU Address bus line
8	A5 CPU Address bus line
9	A6 CPU Address bus line
10	GND Ground
11	A7 CPU Address bus line
12	A8 CPU Address bus line
13	A9 CPU Address bus line
14	A10 CPU Address bus line
15	A11 CPU Address bus line
16	A12 CPU Address bus line
17	A13 CPU Address bus line
18	A14 CPU Address bus line
19	GND Ground
20	A15 CPU Address bus line
21	D0 CPU Data bus line
22	D1 CPU Data bus line
23	D2 CPU Data bus line
24	D3 CPU Data bus line
25	D4 CPU Data bus line
26	D5 CPU Data bus line
27	D6 CPU Data bus line
28	D7 CPU Data bus line
29	GND Ground
30	GND Ground
31	B02,Phi2 CPU Phase 2 clock
32	GND Ground
33	NC Reserved
34	~RST Reset output
35	~IRQ Interrupt request
36	~RDY Ready input
37	NC Reserved
38	~EXTENB CPU External Enable
39	NC Reserved
40	~REF Refresh cycle
41	~CAS Column Address Strobe
42	GND Ground
43	~MPD Math Pack (FP) Disable
44	~RAS Row Address Strobe
45	GND Ground
46	LR/~W Latched read/write
47	800XL: NC. 600XL: +5V
48	800XL: NC. 600XL: +5V
49	Audio input
50	GND Ground

Contributions

Joakim Ögren

Sources

Atari 8-Bit Computers: Frequently Asked Questions by Michael D. Current