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HP 27130B
JUMPER
A
B
C
D
E
F
G
H
J
table 2-1. functions of the memory configuration jumper
FUNCTION
Installed only when a 16K byte EPROM is used in socket
U64.
Position A connects OCE2- of the Memory Interface
Circuit (MIC) to pin 20 (CE-) of the EPROM in socket
U64.
This enables the EPROM in socket U64 whenever
the lower 16K bytes of memory are addressed.
Installed only when a 4K- or BK-byte EPROM is used in
socket U64.
Position B connects OCEO- of the MIC to
pin 1B (CE-) of the 4K-byte EPROM or pin 20 (CE-) of
the BK-byte EPROM, depending on. which EPROM is installed
in socket
U64.
This enables the EPROM in socket U64
whenever the lower BK bytes of memory are addressed.
Installed only when a 4K-byte EPROM is used in socket
U64.
Position C connects +5V power to pin 24 (VDD) of
the 4K-byte EPROM.
Installed only when a 16K-byte EPROM is used in
socket U64.
Position D connects A13 of the address
bus to pin 24 (A13) of the 16K-byte EPROM.
Installed only when an BK-byte EPROM is used in
socket U74.
Position E connects +5V power to pin 27
(VPP-) of the BK-EPROM.
Installed only when an BK-byte static RAM is used in socket U74.
POSition
F connects WR- of the Z-BOB CPU to pin 27 (WE-) of the
static RAM, thus enabling the CPU to write to the RAM.
Installed only when a 2K-byte static RAM is used in socket
U74.
Position
G connects WR- of the Z-B08 CPU to pin 21 (WE-) of the
static RAM, thus enabling the CPU to write to the RAM.
Installed only when a 4K- or 8K-byte EPROM or an BK-byte
static
RAM is used in socket U74.
Position H connects A11 of the Z-BOB
CPU address bus to pin 23 (A11) of the 4K- or BK-byte EPROM or BK
byte
RAM, depending on which device is installed in socket U74.
Installed to enable the MIC wait-state signal when slow EPROMs
(access time greater than 250 nsec) are used in U64 or U74.
2-4
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