RCA 1802 - Code Samples

Code Samples

This code snippet tests ALU OPS, it is a diagnostic routine.

.. TEST ALU OPS 0000 90 GHI 0 .. SET UP R6 0001 B6 PHI 6 0002 F829 LDI DOIT .. FOR INPUT OF OPCODE 0004 A6 PLO 6 0005 E0 SEX 0 .. (X=0 ALREADY) 0006 6400 OUT 4,00 .. ANNOUNCE US READY 0008 E6 SEX 6 .. NOW X=6 0009 3F09 BN4 * .. WAIT FOR IT 000B 6C INP 4 .. OK, GET IT 000C 64 OUT 4 .. AND ECHO TO DISPLAY 000D 370D B4 * .. WAIT FOR RELEASE 000F F860 LDI #60 .. NOW GET READY FOR 0011 A6 PLO 6 .. FIRST OPERAND 0012 E0 SEX 0 .. SAY SO 0013 6401 OUT 4,01 0015 3F15 BN4 * 0017 E6 SEX 6 .. TAKE IT IN AND ECHO 0018 6C INP 4 .. (TO 0060) 0019 64 OUT 4 .. (ALSO INCREMENT R6) 001A 371A B4 * 001C E0 SEX 0 .. DITTO SECOND OPERAND 001D 6402 OUT 4,02 001F E6 SEX 6 0020 3F20 LOOP: BN4 * .. WAIT FOR IT 0022 6C INP 4 .. GET IT (NOTE: X=6) 0023 64 OUT 4 .. ECHO IT 0024 3724 B4 * .. WAIT FOR RELEASE 0026 26 DEC 6 .. BACK UP R6 TO 0060 0027 26 DEC 6 0028 46 LDA 6 .. GET 1ST OPERAND TO D 0029 C4 DOIT: NOP .. DO OPERATION 002A C4 NOP .. (SPARE) 002B 26 DEC 6 .. BACK TO 0060 002C 56 STR 6 .. OUTPUT RESULT 002D 64 OUT 4 .. (X=6 STILL) 002E 7A REQ .. TURN OFF Q 002F CA0020 LBNZ LOOP .. THEN IF ZERO, 0032 7B SEQ .. TURN IT ON AGAIN 0033 3020 BR LOOP .. REPEAT IN ANY CASE

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