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Annotation of 43BSD/sys/mdec/tstoggle.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: _sccsid:.asciz "@(#)tstoggle.s 7.1 (Berkeley) 6/5/86"
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * Prototype toggle in bootstrap code for ts type tapes.
        !            13:  * If on anything but a 780 with the drive on uba0
        !            14:  * this will have to be repaired by patching uba and umem.
        !            15:  */
        !            16:        .set    UBA0,0x20006000
        !            17:        .set    UMEM0,0x2013e000
        !            18:        .set    UBA_MAP,0x800
        !            19:        .set    TSADDR,0772520-0760000
        !            20: 
        !            21: start:
        !            22:        movl    uba,r10
        !            23:        movl    mrv,UBA_MAP(r10)
        !            24:        addl3   mrv,$1,UBA_MAP+4(r10)
        !            25:        addl3   umem,$TSADDR,r11
        !            26:        clrw    2(r11)
        !            27: 1:     tstb    2(r11)
        !            28:        bgeq    1b
        !            29:        movw    $0x200+setchr,(r11)
        !            30: 1:     tstb    2(r11)
        !            31:        bgeq    1b
        !            32:        movw    $0x200+read,(r11)
        !            33:        halt
        !            34:        .align  2
        !            35: uba:   .long   UBA0
        !            36: umem:  .long   UMEM0
        !            37: mrv:   .long   0x80000000
        !            38: setchr:        .word   0xc004,0x200+char,0,0x8 # set characteristics command
        !            39: char:  .word   0x200+status,0,0xe,0    # characteristics
        !            40: read:  .word   0xc001,0,0,0x200        # read command
        !            41: status:

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