IMS IMSAI 8080 User Manual page 223

DELAY SELECTION SOCKET
The delay jumper socket (C9) of thevPROM-4 board allows
the selection of one of four possible memory read cycle
delays. The available delay times are 1, 2, 3, or 4
machine cycles, which translates to 1000, 1500, 2000
and 2500 nanoseconds.
sary to insure the data from PROM is correct before
transmission to the data bus.
available are either 1000 or 1500 nanosecond access
time chips.
board are 1000 ns access time devices.
the access time of the slowest PROM on the board, the
user should jumper the delay socket to produce that
necessary delay.
Table 2 lists jumper pin numbers for the possible delays.
In all cases, jumper the selected pin to p in 15.
The example at the top of the page is jumpered for a
1500 ns delay.
7 - 1 2
This read cycle delay is neces­
The chips provided by IMSAI with the PROM-4
TABLE 2
Delay (ns)
1000
1500
2000
2500
PROM-4, Rev. 3
User Guide
Most 1702-8702 chips
After determining
Pin #
1
2
3
4