Printronix P9012, Maintenance Manual

Page: 239 / 256

C–1 Mnemonics
C
Mnemonics
The following list presents the signal mnemonics used in Chapter 2,
Principles of Operation. Mnemonics with initial letter “N” are negative true,
all others are positive true.
MNEMONIC DEFINITION
+5VHL Is5V from –12V . . . . . . . . . . . .
2MHZCLK 2 MHz System Clock . . . . . . . .
3MHZCLK 3 MHz System Clock . . . . . . . .
AIRFLT Cooling Fan Fault . . . . . . . . . . .
BA0–15 Buffered Address 0 to 15 . . . . . . . . . . .
BD0–7 Buffered Data 0 to 7 . . . . . . . . . . . .
BFC0–2 Function Code 0–2 . . . . . . . . . . .
BIORQ Input Output Cycle . . . . . . . . . . . .
BLR Blower . . . . . . . . . . . . . .
BMREQ Memory Cycle . . . . . . . . . . .
BRKRPWR Breaker Trip Power (+36V) . . . . . . . .
BRKRTRIP Breaker Trip Signal . . . . . . . .
BUS1 Wang Only Signal . . . . . . . . . . . . .
BUSRQ DMA Bus Request . . . . . . . . . . .
BUSY Busy . . . . . . . . . . . . .
BUZZ Buzzer On . . . . . . . . . . . . .
BR/NW Buffered Read/Not Write . . . . . . . . . . .
CDEN Control Code Detect Enable . . . . . . . . . . . .
CDIR1,2 Ribbon Color Direction Sense . . . . . . . . . . .
CFASTRIB Color Fast Ribbon . . . . . . . .
CLK2 2 MHz System Clock . . . . . . . . . . . . .
CLK4 4 MHz System Clock . . . . . . . . . . . . .
CLK8 8 MHz System Clock . . . . . . . . . . . . .