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Annotation of 43BSDReno/sys/mdec/uttoggle.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 "@(#)uttoggle.s 7.1 (Berkeley) 6/5/86"
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * Prototype toggle in bootstrap code for ut 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   $0172440,r2
        !            22:        movw    $0x04c0,26(r2)          /* set tape density & format */
        !            23:        mnegw   $512,6(r2)              /* set frame count */
        !            24:        mnegw   $256,2(r2)              /* set word count */
        !            25:        clrw    4(r2)                   /* set bus address */
        !            26:        movw    $0x39,(r2)              /* set command and go */
        !            27:        halt
        !            28:        .align  2
        !            29: uba:   .long   0x20006000
        !            30: umem:  .long   0x2013e000

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