This is a set of patches for the lock up of some AM100L and AM1000 systems.
Thanks to UltraScience for this information!

The two software patches are for the AM100L.IDV. Vue AM100L.M68

------------------ Find the line that reads:----------------------

INFI:   DEBUG   F3
       REST    A0-A6,D0-D7             ; restore register
       RTE                             ; return

--------Add the following three lines of changes and comments:--------

INFI:   DEBUG   F3
;  [01/05/84]  Lock-up fix: the data register must be read in order
;  to clear out the 6850's interrupt
       MOVB    P.RCV(A4),D1

       REST    A0-A6,D0-D7             ; restore register
       RTE                             ; return

=============================================================================

------------The next patch is to find the following section:---------------


OUTPR:  DEBUG   F4
       TRMOCP                          ; get next output character from TRMSER
       TST     D1                      ; data available?
       BPL     OPRG                    ;   yes -
       ANDW    #^C<OIP>,@A5            ;   no - clear the OIP flag
       MOVB    #CM$16!CM$1STP!CM$TXD!CM$RCE,D7
       CMPW    T.BAU(A5),#2            ; is terminal set for 110 baud?
       BNE     10$                     ;   no -
       MOVB    #CM$16!CM$2STP!CM$TXD!CM$RCE,D7
10$:    MOVB    D7,@A4                  ; set mode bits
OPRD:   BR      INTX                    ; return

=============================================================================

-------------Make the following four lines of changes:-----------------

OUTPR:  DEBUG   F4
       TRMOCP                          ; get next output character from TRMSER
       DEBUG   F5
; [02/10/84] Lock-up fix: the data register must be read in order
; to clear out the 6850's interrupt
       MOVB    P.RCV(A4),D7            ;clear out the 6850 interrupt

       TST     D1                      ; data available?
       BPL     OPRG                    ;   yes -
       ANDW    #^C<OIP>,@A5            ;   no - clear the OIP flag
       MOVB    #CM$16!CM$1STP!CM$TXD!CM$RCE,D7
       CMPW    T.BAU(A5),#2            ; is terminal set for 110 baud?
       BNE     10$                     ;   no -
       MOVB    #CM$16!CM$2STP!CM$TXD!CM$RCE,D7
10$:    MOVB    D7,@A4                  ; set mode bits
OPRD:   BR      INTX                    ; return


============================================================================

The final change is a hardware change for those with a Rev. A or Rev. B
AM100L board.

Replace the U42 with an SN74LS373

You are viewing proxied material from gopher.floodgap.com. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.