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Tau Ceti (Atari ST)

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Source Code#

Bits and pieces of code are strewn throughout the disk. They can be found in the .ipf dump at the hex addresses listed below.

0x05B073:

       E.B D2,SOLIDD
    LSR.W #8,D2
    MOVEQ #0,D1 
    MOVEQ #0,D5
    MOVE.B (A5),D5
    LSL.W #8,D5
    MOVE.L #SHAP_T,A1
    SWAP D1
    SWAP D2
    SWAP D5
    MOVE.B 19(A5),D2
    CMP.B #128,D2
    BCC SOLIEND

0x05B177:

    CLR.W D5
    MOVE.B D2,D5
    CMP.B #80,D2
    BCS SOLN_8
    SUB.B #79,D2

SOLN_7  SWAP D1
    SWAP D2
    SWAP D5
    MOVEQ #0,D6
    ADD.B SOLIDD,D1
    BCC SOLN80
    MOVEQ #1,D6
SOLN80  MOVE.B D5,D0
    ADD.B D6,D0
    BVS SOLN90 
*   BCS SOLN90
    ADD.B D2,D0
    BVS SOLN90
*   BCS SOLN90
    MOVE.B D0,D5
SOLN90  MOVE SR,D7
    SWAP D1
    SWAP D2
    SWAP D5
    MOVE D7,CCR
    BVS SOLIEND
*   BCS SOLIEND
    SUBQ.B #1,D2
    BNE SOLN_7

    SWAP D5
    MOVE.B 0(A1,D5.W),D0
    SWAP D5
    TST.B D0
    BEQ SOLIEND
    MOVE.L #BSCREE+79*128,A3
    BRA SOLN

0x60938:

    MOVE.L A3,D7
    AND.B #$80,D7
    SUB.L #128,D7
    MOVE.L D7,A3
    CMP.L #BSCREE,D7
    MOVE SR,D7
    SWAP D1
    SWAP D2
    MOVE D7,CCR
    BCS DOOREND
    SUB.B #1,D2
    BNE DOOR_8
    SWAP D1
    SWAP D2

0x60A39:

    BSR DO_LI
    SWAP D1
    SWAP D2
    RTS
DO_EDGE DC.L 0

DO_CE   MOVEQ #0,D0
    MOVE.B DO_CRO,D0
    MOVE.B D0,D3
    AND.B #$FC,D0
    ADD.W D0,A3
    MOVE.B D3,D0
    AND.W #3,D0
    ADD.B D0,D0
    ADD.B D0,D0
    MOVE.L 0(A0,D0.W),D4
    MOVE.B D1,D3
    TST.B D3
    BEQ DO_CE3
    MOVE.L #$00FFFFFF,DO_EDGE
DO_C10  MOVE.L D4,D0
    MOVE.L D4,D7
    CMP.B #4,D3
    BCS DO_CE2
    SUBQ.B #1,D3
    AND.L DO_EDGE,D7
    NOT.L D0
    AND.L (A3),D0
    OR.L D7,D0
    MOVE.L D0,(A3)
    MOVE.L #$FF00FF00,DO_EDGE
    ROR.L #2,D4
    BCC DO_C10
    ADDQ.L #4,A3
    MO