You can program the ROM to do simple operations like addition and subtraction. To run the program, set the clear input to ground.
The ROM currently performs 5+11-6.
Instruction OP-Code
LDA - 0x
ADD - 1x
Subtract - 2x
Output - ee
Halt - ff
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Note that collaboration is not real time as of now. Every save overwites the previous data.
@Aiex2 it seems like it's simply splitting the ROM into two portions. The top two rows of hex entries are the instructions,
while the bottom two rows are the numbers. This way, it's better organized. It would be pretty hard to wrap your head
around instructions if they were sequential.
Comment deleted by abc.
Last modified by abc on Mar 15 2018 at 04:30AM UTC.
Very cool. Thanks! I am working on modelling a rotating drum sequencer Like those that preceded the IBM 650. This is a great reference.
this is righteous
This is cool ,but why does the program counter count 0 8 1 9 2 A... instead of 0,1,2,3,4...
@Aiex2 it seems like it's simply splitting the ROM into two portions. The top two rows of hex entries are the instructions,
while the bottom two rows are the numbers. This way, it's better organized. It would be pretty hard to wrap your head
around instructions if they were sequential.
How were the C39, C40, C41 and C43 names chosen? What logic is there behind them?
David Stevens
http://joshcorbin.com/sap-1-complete/ This sap circuit was taken from the Logisim implementation of the same.