Printronix P9012 Maintenance Manual page 239

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
+5VHL
2MHZCLK
3MHZCLK
AIRFLT
BA0–15
BD0–7
BFC0–2
BIORQ
BLR . . . . . . . . . . . . . .
BMREQ
BRKRPWR
BRKRTRIP
BUS1
BUSRQ
BUSY
BUZZ
BR/NW
CDEN
CDIR1,2
CFASTRIB
CLK2
CLK4
CLK8
Mnemonics
DEFINITION
. . . . . . . . . . . . Isolated +5V from –12V
. . . . . . . . 2 MHz System Clock
. . . . . . . . 3 MHz System Clock
. . . . . . . . . . . Cooling Fan Fault
. . . . . . . . . . . Buffered Address 0 to 15
. . . . . . . . . . . . Buffered Data 0 to 7
. . . . . . . . . . . Function Code 0–2
. . . . . . . . . . . . Input Output Cycle
Blower
. . . . . . . . . . . Memory Cycle
. . . . . . . . Breaker Trip Power (+36V)
. . . . . . . . Breaker Trip Signal
. . . . . . . . . . . . . Wang Only Signal
. . . . . . . . . . . DMA Bus Request
. . . . . . . . . . . . . Busy
. . . . . . . . . . . . . Buzzer On
. . . . . . . . . . . Buffered Read/Not Write
. . . . . . . . . . . . Control Code Detect Enable
. . . . . . . . . . . Ribbon Color Direction Sense
. . . . . . . . Color Fast Ribbon
. . . . . . . . . . . . . 2 MHz System Clock
. . . . . . . . . . . . . 4 MHz System Clock
. . . . . . . . . . . . . 8 MHz System Clock
C–1