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Annotation of 43BSD/sys/mdec/tmtoggle.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 "@(#)tmtoggle.s 7.1 (Berkeley) 6/5/86"
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * Prototype toggle in bootstrap code for tm type tapes.
        !            13:  * If on anything but a 780 with the drive on uba0
        !            14:  * this will have to be repaired by patching uba and umem.
        !            15:  */
        !            16: begin:
        !            17:        movl    uba,r1
        !            18:        movl    $0x80200000,0x800(r1)
        !            19:        clrl    0x804(r1)
        !            20:        movl    umem,r2
        !            21:        bisl2   $0172520,r2
        !            22:        mnegw   $512,4(r2)
        !            23:        clrw    6(r2)
        !            24:        movw    $03,2(r2)
        !            25:        halt
        !            26:        .align  2
        !            27: uba:   .long   0x20006000
        !            28: umem:  .long   0x2013e000

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