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Annotation of 42BSD/sys/mdec/tstoggle.s, revision 1.1

1.1     ! root        1: /*     tstoggle.s      6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Prototype toggle in bootstrap code for ts type tapes.
        !             5:  * If on anything but a 780 with the drive on uba0
        !             6:  * this will have to be repaired by patching uba and umem.
        !             7:  */
        !             8:        .set    UBA0,0x20006000
        !             9:        .set    UMEM0,0x2013e000
        !            10:        .set    UBA_MAP,0x800
        !            11:        .set    TSADDR,0772520-0760000
        !            12: 
        !            13: start:
        !            14:        movl    uba,r10
        !            15:        movl    mrv,UBA_MAP(r10)
        !            16:        addl3   mrv,$1,UBA_MAP+4(r10)
        !            17:        addl3   umem,$TSADDR,r11
        !            18:        clrw    2(r11)
        !            19: 1:     tstb    2(r11)
        !            20:        bgeq    1b
        !            21:        movw    $0x200+setchr,(r11)
        !            22: 1:     tstb    2(r11)
        !            23:        bgeq    1b
        !            24:        movw    $0x200+read,(r11)
        !            25:        halt
        !            26:        .align  2
        !            27: uba:   .long   UBA0
        !            28: umem:  .long   UMEM0
        !            29: mrv:   .long   0x80000000
        !            30: setchr:        .word   0xc004,0x200+char,0,0x8 # set characteristics command
        !            31: char:  .word   0x200+status,0,0xe,0    # characteristics
        !            32: read:  .word   0xc001,0,0,0x200        # read command
        !            33: status:

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