Vector 4 - Page 194

SIGNAL
IORD
IOWR
MREQ
WR
IORQ
RD
RD
BUSAK
RESET
88ENBL
DISENBL
VSYNC
HSYNC
MA17
L§ (raster ad-
L1 dress lines)
L2 (raster ad-
L3 (dress lines)
ALPH/GRAPH
WR
WR1
09-01-82
LOCATION
U84-13
U84-10
U64-2
U83-6
U64~12
U83-10
U83-12
U1-23
U104-12
U102-8
U98-18
U98-40
U98-39
VECTOR 4
TECHNICAL INFORMATION
DESCRIPTION
Low except when reading from 1/0
Low except when writing to I/0
High during memory requests (WR,
RD)
Low when writing
High during request from I/0O
devices -
Low when reading 1/0, memory,
ete,
High when reading /O, memory,
ete. |
High excep"c at power on/reset
High only after BUSAK has been
executed
Active constantly
Active
Active
U62-15, U65-13 Active when enabled for selecting
U98-38
U98-37
U98-36
U98-35
U33-5
U49-11
U49-8
7200-0001
upper and lower memory blocks
Active high
Active high
Active high
Active high
Active
Active
Active
V 4-5