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

1.1     ! root        1: /*     uttoggle.s      6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Prototype toggle in bootstrap code for ut 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: begin:
        !             9:        movl    uba,r1
        !            10:        movl    $0x80200000,0x800(r1)
        !            11:        clrl    0x804(r1)
        !            12:        movl    umem,r2
        !            13:        bisl2   $0172440,r2
        !            14:        movw    $0x04c0,26(r2)          /* set tape density & format */
        !            15:        mnegw   $512,6(r2)              /* set frame count */
        !            16:        mnegw   $256,2(r2)              /* set word count */
        !            17:        clrw    4(r2)                   /* set bus address */
        !            18:        movw    $0x39,(r2)              /* set command and go */
        !            19:        halt
        !            20:        .align  2
        !            21: uba:   .long   0x20006000
        !            22: umem:  .long   0x2013e000

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