IBM RT Series Hardware Reference Manual page 364

TNL SN20-9844 (March 1987) to 75X0235
Queue Load
Reg Function
RA A23-A17 Source high
RB A16-A9 Source mid
R4 AS-AI Source low
R3 Bit offset
R2 Skip (16 bit words)
R 7 X destination
R6 Y destination
R5 Delta X
+
1
RO Delta Y
+
1
Execute Command
Value of
Register
X'AOOO'
X'BOOS'
X'4009'
X'3004'
X'203D'
X'702A'
X'600F'
X'501F'
X'0003'
X'D379'
Comment
Upper left start word address
Upper left start word address
Upper left start word address
Starting bit of the starting word
Array width
=
X'OSO' bytes
Lower right corner exclusive
Lower right corner exclusive
Number of pels in width
Number of pels in height
Note: The registers used by the DMA graphic operations have the following ending conditions:
Reg Value of Change From Initial Conditions
RA
RB
R4
R3
R2
R7
R6
R5
RO
Register
X'AXXX'
X'BXXX'
X'4XXX'
X'3XXX'
X'2XXX'
X'7XXX'
X'6XXX'
X'5XXX'
X'OOOO'
A23-A 17
=
Address of last I/O channel memory word
read
A 16-A9 = Address of last I/O channel memory word
read
AS-A 1
=
Address of last I/O channel memory word
read
Unchanged
Unchanged
Unchanged
Unchanged
Unchanged
Set to zero
52
Extended Monochrome Graphics Adapter