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The printer attachment sends the hex value 4/0 to the CPU
on DBI. This value is added to the zeros in the B register to
move the 4/0 through the ALU. The printer attachment
activates store new to enter the 4/0 into storage.
1/0 cycle
Clock
8
2
3
4
5
Addr
Miscellaneous
Compute Mod
6
7
Mod
8
Hi
LSR Select Lines
From Attachment
~~---
__
-_,~:----~:..__-_-
_ _ -L: ____
~:L------_,~:--------------------~
LS R Select Buffer
Set Pulse (Requires
Negative Shift to
Set Buffer)
LS
R Select Buffer
___Jl:--
----1r--- - --:;-- - ---- -- -- -:
I
!1
u
I
LSR Write Pulse
DBI (from attach-
ment)
DBI Buffer
A Register
( 1/0 Cycle)
ALU Out Latched
cp;,
oeo*
_J
LI
Results of
modify
high from
previous cycle
c~i;
St;al]
Assignment
*DBO during a cycle steal equals ALU Out
except during 7D to OC when the cycle
steal assignment is gated on DBO.
Figure 3-60 (Part 2 of 2). 1/0 Cycle Data Transfer
Li
±OBI
LI
B ±DBI
Li
LSR
Low
if
±DBI
Li
u
nf
cv~1~ st~a1
Assignment
5410 TO
3-41
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