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Annotation of 43BSD/sys/mdec/httoggle.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 "@(#)httoggle.s 7.1 (Berkeley) 6/5/86"
        !             9: #endif not lint
        !            10: 
        !            11: 
        !            12: /*
        !            13:  * Prototype toggle in bootstrap code for ht type tapes.
        !            14:  * If on anything but a 780 with a tape at slave 1 of mba 1
        !            15:  * this will have to be repaired by patching mba and ht.
        !            16:  */
        !            17:        movl    mba,r10
        !            18:        mull3   ht,$0x80,r11
        !            19:        addl3   r11,r10,r11
        !            20:        addl2   $0x400,r11
        !            21:        movl    $1,4(r10)
        !            22:        movl    $9,(r11)
        !            23:        cvtwl   $012300,0x24(r11)
        !            24:        clrl    12(r10)
        !            25:        movl    $0x80000000,0x800(r10)
        !            26:        cvtwl   $-512,16(r10)
        !            27:        movl    $0x39,(r11)
        !            28:        halt
        !            29:        .align  2
        !            30: mba:   .long   0x20012000
        !            31: ht:    .long   0

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