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Annotation of 41BSD/4.0.upgrade/sys/mdec/mttoggle.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Prototype toggle in bootstrap code for mt type tapes.
        !             3:  * If on anything but a 780 with a tape at drive 0 of mba 1
        !             4:  * this will have to be repaired by patching mba and mt.
        !             5:  */
        !             6:        movl    mba,r10
        !             7:        mull3   mt,$0x80,r11
        !             8:        addl3   r11,r10,r11
        !             9:        addl2   $0x400,r11
        !            10:        movzbl  $1,4(r10)
        !            11:        movzbl  $4,8(r11)               /* drive zero, one record */
        !            12:        clrl    12(r10)                 /* set address to zero */
        !            13:        movl    $0x80000000,0x800(r10)  /* validate map register */
        !            14:        cvtwl   $-512,16(r10)           /* set byte count */
        !            15:        movzwl  $512,20(r11)            /* set byte count */
        !            16: 0:
        !            17:        movl    0x44(r11),r0
        !            18:        bbc     $15,r0,0b
        !            19:        movzbl  $071,(r11)              /* read forward, go */
        !            20:        halt
        !            21:        .align  2
        !            22: mba:   .long   0x20012000
        !            23: mt:    .long   0

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