Commodore 128 Programmer's Reference Manual page 647

CI28 HARDWARE SPECIFICATIONS 637
EXPANSION BUS PINOUT
n
H
n
n
r
n
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
A
B
C
D
E
F
H
J
K
L
M
N
P
R
S
T
U
V
w
X
Y
Z
NAME .
GND
+ 5V
+ 5V
/IRQ
R/W
DCLOCK
I/O!
/GAME
/EXROM
I/O2
/ROML
BA
/DMA
D7
D6
D5
D4
D3
D2
D2
Do
GND
GND
/ROMH
/RESET
/NMI
1MHz
TA15
TA14
TA13
TA12
TAn
TA10
TA9
TA8
SA7
SA6
SA5
SA4
SA3
SA2
SA,
SA0
GND
DESCRIPTION
System Ground
System Vcc
System Vcc
Interrupt Request
System Read Write Signal
8.18 MHz Video Dot Clock
I/O Chip Select: $DE00-$DEFF, Active Low
Sensed for Memory Map Configuration
Sensed for Memory Map Configuration
I/O Chip Select: $DF00-$DFFF, Active Low.
External ROM Chip Select, $8000-$BFFF in C128 Mode
($8000-$9FFF in C64 mode)
Bus Available Output
Direct Memory Access Input (see caution on DMA capability
on p. 636)
Data Bit 7
Data Bit 6
Data Bit 5
Data Bit 4
Data Bit 3
Data Bit 2
Data Bit 1
Data Bit 0
System Ground
System Ground
External ROM Chip Select, $C000-$FFFF in C128 Mode
($C000-$FFFF in C64 mode)
System Reset Signal
Non-Maskable Interrupt Request
System 1MHz <t>0 Clock
Translated Address Bit 15
Translated Address Bit 14
Translated Address Bit 13
Translated Address Bit 12
Translated Address Bit 11
Translated Address Bit 10
Translated Address Bit 9
Translated Address Bit 8
Shared Address Bit 7
Shared Address Bit 6
Shared Address Bit 5
Shared Address Bit 4
Shared Address Bit 3
Shared Address Bit 2
Shared Address Bit 1
Shared Address Bit 0
System Ground
Table 16-21. Expansion Bus Pinout