Operating instructions

a. If a binary card, use RCB, octal
250YY01.
b. If a decimal card, use RCD, octal
250YYOO.
YY is the starting address where the card
is to be read. The handiest address is
zero; if this cannot be used, remember that
the address must be
a multiple of 128 and
less than
2048; that is, multiples of octal
200 and less than octal 4000.
4.
Depress the A to I switch.
5. Hold down the hopper-empty switch on the
card reader and press the START switch
on the console. (reads cards)
6.
By using option switches, set a write-card
instruction into the A register:
a. If a binary card, use
WCB, octal
250YY03.
b. If a decimal card, use WCD, octal
250YY02.
7.
Depress the A to I switch.
8. Depress the START switch. (punches cards)
9. Depress the MANUAL CYCLE switch on
the card punch twice to clear punched card
into output hopper.
If more than one copy of the
card
is needed, repeat
steps
7 and 8 as many times as there are cards
needed (the write-card instruction remains in
A and
can be transferred to the I register and executed
as many times as necessary.)
Saving Information in A
When an operator manually enters changes to a pro-
gram, it
is usually necessary to save information in
the
A register before entering new information. It
must be remembered, however, that changes should
never be made by this method without instructions
to do so by the programmer. The procedure for
saving the information in the A register and the
location of the
P counter is as follows:
1. Place in a down position the option switches
corresponding to the ones (the lights) of the
A register. These switches are now a
reminder to the operator of what was
originally in A.
2. Raise the RESET A switch to clear the
A register.
3.
Lower the SAVE P switch to save the infor-
mation in the
P counter.
4.
Raise the optioil switches corresponding to
the ones of the new information to be entered
into
A. Return to the down position any of
the switches which were in that position
(as a result of step
1).
5. Move the new information now in the A
register to wherever it will be used in the
program, for example,
move it to the I
register by depressing
A to I (See "Load-
ing Data Manually))).
6. Raise the RESET A switch to clear the A
register.
Raise to the up position all of the option
switches which are down (as a result of
step
1). Since the switches are spring
loaded, they will autonlatically return to
the
normal position. This returns the ori-
ginal information to the A register by
entering ones into
A to correspond with the
down switches.
8. Raise the SAVE P switch (lowered in step
3) to restore the original iirfornnation to the
P counter.
Extracting Data from Memory
~fter a series of ir~structions or data has been loaded,
the operator may want to check the contents of mem-
ory. The following steps can be used any time the
operator wishes to know what
is in any particular
cell in memory. Once the information
is displayed,
it
is a simple matter to correct it and return it to
memory (see 'Loading Data Manually'). It
is assumed
the
AUTO/MANUAL switch is set to MANUAL and the
INSTR~WORD switch is set to INSTR, and no alarms
lights are on.
1. If it is desired to save P, set the SAVE P
switch.
2. Toggle the RESET A switch, thus leaving
an LDA instruction
in the A register (Load
A is an octal
00).
3. Load the memory location of the informa-
tion desired into bit positions 7 through
19 of the A register.
4.
Depress the A to I switch.
5. Depress the START switch.
The contents of the memory location specified in step
2 now appears in the A register.