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The address is now at 0 as indicated by the lights labelled
ADDRESS BUS.
instruction.
The bit pattern for the input instruction must be set in the
center group of switches labelled ADDRESS-DATA.
6, 4, 3, 1 and 0 should be placed in the up
pare these switch positions with the binary representation of
the input instruction listed on the first line of test pro
gram 1.
We wish now to deposit this bit pattern in memory
position 0* Raise the DEPOSIT/DEPOSIT
ily to the DEPOSIT position and release.
should still show 0 (no lights lit) and the data bus should
now show the bit pattern set in the switches (bits 7, 6, 4,
3, 1 and 0 lit and bits 5 and 2 off).
Next, the bit pattern for the address of the input port should
be written in position 1.
eight ADDRESS-DATA switches up, corresponding with the address
listed on line 2 of Test Program One, and the DEPOSIT/DEPOSIT
NEXT switch depressed momentarily to the DEPOSIT NEXT position
and released.
Now the address bus light should show position 1 (address bus
light 0 on and all other address bus lights off).
bus should show all eight lights lit corresponding to the bit
pattern written here.
Program One should be set into the ADDRESS-DATA switches and
deposited by operating the DEPOSIT NEXT switch, each time
checking to make sure that the data bus lights correspond
with the settings of the ADDRESS-DATA switches and that the
address is correct indicating that no steps have been skipped
or done twice.
When the last byte has been deposited in address position 6,
then all 16 address switches should be returned to the 0
position (down) and the EXAMINE switch operated.
reset the address bus lights to 0, and display the contents
of the bottom word in memory on the data bus lights.
should still be the binary pattern listed in line 1 of the Test
Program).
the address bus lights should indicate address 1 (bit 0 on
and all other bits off).
now of memory location one which should correspond to the sec
ond line of Test Program One listing (all ones).
The EXAMINE NEXT switch can be repeatedly operated, each time
checking that the data located in the consecutive memory loca
tion corresponds exactly to the listing for Test Program One.
36
Into position 0 we wish to put an input
Similarly, the next five lines of Test
The EXAMINE NEXT switch.can then be operated and
The Data Bus should show the contents
IMSÄI 8080
General Assembly and
Test Instructions
NEXT switch up momentar
The address bus
This can be done by setting all
Switches 7,
position.
Com
The data
This should
(This
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