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 Snapshot date: 2025-09-09
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Signal Definiton

Modified RC2014 Bus for CRC65

Introduction

CRC65 has an expansion bus that's based on RC2014 bus. It is a single-row, 39-pin, right-angle male connector. The addresses, data and power signals are same as RC2014, many of the control signals are also the same. The different signals are 6502-specific.

Signal Definiton

Pin Number	Signal Name
1	Address 15, A15
2	Address 15, A14
3	Address 15, A13
4	Address 15, A12
5	Address 15, A11
6	Address 15, A10
7	Address 15, A9
8	Address 15, A8
9	Address 15, A7
10	Address 15, A6
11	Address 15, A5
12	Address 15, A4
13	Address 15, A3
14	Address 15, A2
15	Address 15, A1
16	Address 15, A0
17	Ground
18	VCC
19	Spare
20	Reset
21	PHI2 Clock
22	Interrupt, IRQ
23	Non-maskable interrupt, NMI
24	Read/write, RWB
25	RDY
26	~~SYNC~~ EXIO (note: require engineering change for Rev0 PCB)
27	Data, D0
28	Data, D1
29	Data, D2
30	Data, D3
31	Data, D4
32	Data, D5
33	Data, D6
34	Data, D7

Table of Contents

Table of Contents

Modified RC2014 Bus for CRC65

Introduction

Signal Definiton