10
Both connectors are female on the KIM Clone. EXPA has 30 connections while EXPB
has 40. The connectors are standard 2x15 or 2x20 pins with .1” (2.54mm) spacing
between pins.
EXPA is located above EXPB. The lower pins on EXPB (39 and 40) are centered 1.5”
from the bottom edge of the board. The top pins (1 and 2) are located 3.4” from the
bottom of the board. EXPA pins 29 and 30 are located 4.4” from the bottom of the
board, and pins 1 and 2 are 5.8” from the bottom. These distances will remain the
same in future versions unless there is major problem that requires changes.
EXPA Connector
Pin
KIM Clone
Use
1 & 2
Ground
3 & 4
+8 VDC
5 & 6
Reserved
Reserved for +5 on motherboards
7
/RESET
6502 RESET line, active low
8
PH2
6502 phase 2 clock
9
PH0
6502 phase 0 clock
10
SO
6502 SO signal
11
R/W
High = read, low = write
12
PH1
6502 phase 1 clock
13
/RDY
14
/IRQ
15
SYNC
16
/NMI
17
/RAM_SELECT
Pull low to select RAM on KIM Clone, or pulled
low when KIM Clone RAM is
selected.
18
Reserved
Reserved for motherboard use.
19 & 20
Reserved
21 – 30
Not used
User-defined functionality
EXPB Connector
Pin
KIM Clone
Use
1 & 2
Ground
3
A15
4
A14
5
A13
6
A12
7
A11
