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Annotation of 41BSD/4.0.upgrade/sys/mdec/tstoggle.s, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Prototype toggle in bootstrap code for ts 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:        .set    UBA0,0x20006000
                      7:        .set    UMEM0,0x2013e000
                      8:        .set    UBA_MAP,0x800
                      9:        .set    TSADDR,0772520-0760000
                     10: 
                     11: start:
                     12:        movl    uba,r10
                     13:        movl    mrv,UBA_MAP(r10)
                     14:        addl3   mrv,$1,UBA_MAP+4(r10)
                     15:        addl3   umem,$TSADDR,r11
                     16:        clrw    2(r11)
                     17: 1:     tstb    2(r11)
                     18:        bgeq    1b
                     19:        movw    $0x200+setchr,(r11)
                     20: 1:     tstb    2(r11)
                     21:        bgeq    1b
                     22:        movw    $0x200+read,(r11)
                     23:        halt
                     24:        .align  2
                     25: uba:   .long   UBA0
                     26: umem:  .long   UMEM0
                     27: mrv:   .long   0x80000000
                     28: setchr:        .word   0xc004,0x200+char,0,0x8 # set characteristics command
                     29: char:  .word   0x200+status,0,0xe,0    # characteristics
                     30: read:  .word   0xc001,0,0,0x200        # read command
                     31: status:

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