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

1.1       root        1: /*     tstoggle.s      6.1     83/07/29        */
                      2: 
                      3: /*
                      4:  * Prototype toggle in bootstrap code for ts 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:        .set    UBA0,0x20006000
                      9:        .set    UMEM0,0x2013e000
                     10:        .set    UBA_MAP,0x800
                     11:        .set    TSADDR,0772520-0760000
                     12: 
                     13: start:
                     14:        movl    uba,r10
                     15:        movl    mrv,UBA_MAP(r10)
                     16:        addl3   mrv,$1,UBA_MAP+4(r10)
                     17:        addl3   umem,$TSADDR,r11
                     18:        clrw    2(r11)
                     19: 1:     tstb    2(r11)
                     20:        bgeq    1b
                     21:        movw    $0x200+setchr,(r11)
                     22: 1:     tstb    2(r11)
                     23:        bgeq    1b
                     24:        movw    $0x200+read,(r11)
                     25:        halt
                     26:        .align  2
                     27: uba:   .long   UBA0
                     28: umem:  .long   UMEM0
                     29: mrv:   .long   0x80000000
                     30: setchr:        .word   0xc004,0x200+char,0,0x8 # set characteristics command
                     31: char:  .word   0x200+status,0,0xe,0    # characteristics
                     32: read:  .word   0xc001,0,0,0x200        # read command
                     33: status:

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