HP 7957A Hardware Manual page 54

Theory Of Operation
7957/7958
Mnemonic
RREQ
RWEN
STPSTR
UEN
3-22
Table 3-3. Mnemonic Table (continued)
Definition Source
Remote Request DDC
Read/Write Enable
Control, Clock
Generation and Stretcher
circuit
Stop Stretch
Control, Clock
Generation and Stretcher
Microprocessor Enable DMA Bus Arbiter
Description
Control signal to DMA
Bus Arbiter requesting a
remote transfer
Signal to enable micro-
processor to DMA bus
Signal used to Terminal
Clock Stretch
Ena ble microprocessor
for access to DMA bus