Commodore 128 Programmer's Reference Manual page 641

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C128 HARDWARE SPECIFICATIONS 631
THE 23256 ROM
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PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
NAME
Vpp
A12
A7
A*
A5
A4
A3
A2
Ai
Ao
Do
D,
D2
GND
D3
D4
D5
D7
/CE-/PGM
A10
/OE
An
A9
A8
A13
AM
Vcc
DESCRIPTION
Programming Voltage
Address Bit 12
Address Bit 7
Address Bit 6
Address Bit 5
Address Bit 4
Address Bit 3
Address Bit 2
Address Bit 1
Address Bit 0
Data Bit 0
Data Bit 1
Data Bit 2
Power Supply Ground
Data Bit 3
Data Bit 4
Data Bit 5
Data Bit 6
Data Bit 7
Chip Enable-Program Enable (Active Low)
Address Bit 10
Output Enable (Active Low)
Address Bit 11
Address Bit 9
Address Bit 8
Address Bit 13
Address Bit 14
Power Supply +5 Vdc
Table 16-20. 23256 ROM Pinout (Internal or External Function ROMs)