Service Manuals, User Guides, Schematic Diagrams or docs for : xerox mesa 4.0_1978 listing Mesa_4_Microcode MBoot.asm_Sep78

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MBoot.asm                               2-Sep-78 17:21:64              Page   1


  ALTO MESA BOOT LOADER - MBoot.asm
  LOADED ALMOST ANYWHERE AND EXECUTED
  R. Johnsson - 20 Feb 76
  Last edited March 20, 1978 6:40 PM
           . TITL BOOT
           .TXTM B
           .ENT MBOOT
           .ENT SwatFlag
           .SREL
           MBOOT: BOOT
           SwatFlag: BREAK
           .NREL
           .GET "Mesa-NovaDefs.asm"


;ACO is pointer to argument list
BOOT:      MOV   0   2
           LOA   3   0,2                   POINTER TO BOOTMAP RECORD
           LOA   0   0,3                   SN1
           STA   0   DCB1+snl
           STA   0   DCB2+snl
           LOA   0   1,3
           STA   0   OCB1+sn2
           STA   0   DCB2+sn2
           LOA   0   5,3                   first page
           STA   0   DCB2+pagenumber
           NEG   0   0                     -1
           COM   0   0
           STA   0   OCB1+pagenumber
           LOA   0   C6
           ADO   3   0
           STA   0   PGPTR
           LOA   0   1,2
           STA   0   OCB1+diskaddress
           LOA   0   2,2                   initial State
           STA   0   currentState
BLTLOOP;
           LOA 0 C3
           ADD 0 2
           LOA 0 0,2
           MOV 0 0 SNR
             JMP DOlT
           LOA 1 1,2
           LOA 3 2,2
           BLT                   do some BLTs
           JMP BLTLOOP
C3:        3
DOlT:
           DIR                  ; NO MORE INTERRUPTS
           SUB   0   0          ;CLEAR SOME LOCATIONS
           LOA   2   PAGEl      ; POINTER TO PAGE 1 LOCATIONS
           STA   0   OISP,2     ; DISPLAY OFF
           STA   0   IWW,2      ;WAKEUPS WAITING
;        JSR     .+1           ;RELOCATE CURSOR POINTERS
;CURFIX:               LOA 1 POCURSORM1
         ADD     3 1
         STA     1 POCURSORM1
         LOA     1 PMCURSORMl
         ADO     3 1
         STA     1 PMCURSORMl
           LOA   0 PCURSORMl
           LOA   1 PMCURSORM1
           LOA   3 CN16
           BLT                  ;SAVE OLD CURSOR
           LOA   0 PMCURSORMl
           LOA   1 CURENO
           LOA   3 CN16
MBoot. asm                             2-Sep-78 17:21:54                                Page   2


           BLT                   ;INSERT MESA CURSOR
     NOW FIXUP THE ADDRESSES IN THE DISK BLOCKS
          JSR    .+1
F:        MOV    3 1              ADDR OF FIXUP TO ACl
          LOA    2 DCB2           OFFSET OF FIRST DCB IS IN SECOND
          LOA    3 DCBl           AND VICE VERSA
          ADD    1 2
          ADD    1 3               THE FIXUPS
          STA    2 DCBl
          STA    3 DCBl
     NOW FIX THE HEADER AND LABEL ADDRESSES
           LOA   0   3   2
           ADD   1   0
           STA   0   3   2
           LOA   0   4   2
           ADD   1   0
           STA   0   4   2
           LOA   0   3   3
           ADD   1   0
           STA   0   3   3
           LOA   0   4   3
           ADD   1   0
           STA   0   4   3
     START THE DISK AND JUMP INTO LOOP
           LOA   0 @PGPTR          pick up first data address
           STA   0 data 2                  STORE IT IN DeB
           STA   2 @PDBLK
           JMP   ADVANCE


     DCBl AND DCB2 ARE THE DISK CONTROL BLOCKS
       layout of disk command block
           next = 0
           status .. 1
           command .. 2
           header = 3
           label

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