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PRINTER SCOPING TECHNIQUE--1403
Tiedown of home pulse:
Remove the card at location 14AlE22 (53.40. 01, 2H), insert
it on a card extender, and pull extender wire to isolate pin Q,
the carriage stopped line. Then jumper from pin P at 14A1F15
(53.30.01, 5E), chain home, to pin Q on the card in the extender.
ERROR DETECTION SUMMARY
Program Checks
I/O Interlock:
(18.14.11)
l'
rogram failed to use R(I)$ or R(I)d that branched
between I/O operations on same channel. CPU
slops at I3 for M/L/U op codes, and at I op for
F/K op codes.
Address Check: Address has zone bits in the ten thousand,
(18.14.11)
thousands, or units position.
REC Interlock:
(13. 74. 02)
Hcvcrse scan past highest storage address except
during move, load, clear op, or display or alter
01mrations.
Forward scan through address 00000.
Program failed to follow a file write op with a
read back check before attempting another file op
on that channel.
Instruction Check: The five (5) actual logic lines that can bring
(18.14.11)
up
Instruction Check are:
1.
No "Stop at--" for the logic clock.
*2.
Both the logic clock and exterition ring running
(LGA and LGR).
:i.
The TLU mod = 8, A, or
B
bit.
4.
No cycle control latch on at LLG.
*5.
More than one cycle control latch on at LLG,
except E, or F with A, B, C, D, I or X.
Program Errors that will cause an instruction check:
l.
TLU mod= 8, A, or B bit.
2.
Undefined mod for
J
or Y op code. (Neither
the branch or no branch is set. Result: No I or
B
cycle control latch on) Stop I7 LGA.
:i.
[[legal op codes (No op code grouping lines
available to set I cycle control for I2)
Stop - I1 LGA.
4.
No Word Mark (I op or LffiO) or improperly
placed Word Mark will prevent setting I
cycle control.
If a stop occurs in either I op LGA or during
the cycle, the improperly placed WM is read
out of core.
• Not on early machine.
93
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