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Annotation of 42BSD/sys/mdec/uttoggle.s, revision 1.1.1.1

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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