Tandy 1000 HX Technical Reference Manual page 21

• TANDY COMPUTER PRODUCTS •
The following are not sourced by the CPU but are to be
SOURCED (0) Output or Loaded (I) Input by an external DMA
source:
15
RFSH
DRQ1
FDCDMRQ
DRQ3
REFRESH*
DACKl*
FDCDACK*
DACK3*
DMATC
+5VDC
+12VDC
-12VDC
GROUND
I
I
I
I
0
0
0
0
0
+5VDC
+12VDC
-12VDC
Power
REQUEST DMA
CHANNEL*0
REQUEST DMA
CHANNEL*1
REQUEST DMA
CHANNEL*2
REQUEST DMA
CHANNEL*3
ACKNOWLEDGE DRQO*
ACKNOWLEDGE DRQl*
ACKNOWLEDGE DRQ2*
ACKNOWLEDGE DRQ3*
TERMINAL COUNT
Dedicated input
requests to DMA
1 MOS load 40/160 UL
Dedicated output
acknowledges from DMA.
Used by DMA Controller
to indicate Terminal
Count reached.
Drive: 2/2 UL
4% 1.0 Amps available on the bus.
5% .3 Amps available on the bus.
+8.3% - 25% 0.06 Amps available on the bus.
Return for +5, +12, -12 VDC.