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

1.1     ! root        1: /*
        !             2:  * Prototype toggle in bootstrap code for tm type tapes.
        !             3:  * If on anything but a 780 with the drive on uba0
        !             4:  * this will have to be repaired by patching uba and umem.
        !             5:  */
        !             6: begin:
        !             7:        movl    uba,r1
        !             8:        movl    $0x80200000,0x800(r1)
        !             9:        clrl    0x804(r1)
        !            10:        movl    umem,r2
        !            11:        bisl2   $0172520,r2
        !            12:        mnegw   $512,4(r2)
        !            13:        clrw    6(r2)
        !            14:        movw    $03,2(r2)
        !            15:        halt
        !            16:        .align  2
        !            17: uba:   .long   0x20006000
        !            18: umem:  .long   0x2013e000

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