git.sur5r.net Git - cc65/blob - asminc/cbm610.inc

   1 ;
   2 ; Zeropage and I/O definitions for the CBM 610
   3 ;
   4 ; Taken from a kernal disassembly done by myself in 1987.
   5 ;
   6 ; Ullrich von Bassewitz, 28.09.1998
   7
   8
   9 ; ---------------------------------------------------------------------------
  10 ; Zeropage stuff
  11
  12 ExecReg         := $00
  13 IndReg          := $01
  14
  15 TXTPTR          := $85          ; Far pointer into BASIC source code
  16
  17 ; ---------------------------------------------------------------------------
  18 ; Screen size
  19
  20 XSIZE           = 80
  21 YSIZE           = 25
  22
  23 ; ---------------------------------------------------------------------------
  24 ; I/O definitions
  25
  26
  27 ; I/O  $d800: CRTC 6545
  28
  29 .struct CRTC
  30         ADDR    .byte
  31         DATA    .byte
  32 .endstruct
  33
  34
  35 ; I/O  $db00: CIA 6526, Inter Process Communication
  36 ;
  37 ;       IPCcia          =       $db00
  38
  39 .struct CIA
  40         PRA     .byte
  41         PRB     .byte
  42         DDRA    .byte
  43         DDRB    .byte
  44         .union
  45             .struct
  46                 TALO    .byte
  47                 TAHI    .byte
  48             .endstruct
  49             TA          .word
  50         .endunion
  51         .union
  52             .struct
  53                 TBLO    .byte
  54                 TBHI    .byte
  55             .endstruct
  56             TB          .word
  57         .endunion
  58         TOD10   .byte
  59         TODSEC  .byte
  60         TODMIN  .byte
  61         TODHR   .byte
  62         SDR     .byte
  63         ICR     .byte
  64         CRA     .byte
  65         CRB     .byte
  66 .endstruct
  67
  68
  69 ; I/O  $dc00: CIA 6526
  70 ;
  71 ;       cia             =       $dc00
  72
  73
  74 ; I/O  $dd00: ACIA 6551
  75 ;
  76 ;       acia            =       $dd00
  77
  78 .struct ACIA
  79         DATA    .byte
  80         STATUS  .byte
  81         CMD     .byte
  82         CTRL    .BYTE
  83 .endstruct
  84
  85
  86 ; I/O  $de00: Triport #1 6525
  87 ;
  88 ;       tpi1            =       $de00
  89
  90 .struct TPI
  91         PRA     .byte
  92         PRB     .byte
  93         .union
  94                 PRC     .byte
  95                 INT     .byte
  96         .endunion
  97         DDRA    .byte
  98         DDRB    .byte
  99         .union
 100                 DDRC    .byte
 101                 IMR     .byte
 102         .endunion
 103         CR      .byte
 104         AIR     .byte
 105 .endstruct
 106
 107
 108 ; I/O  $df00: Triport #2 6525
 109
 110 ;       tpi2            =       $df00
 111
 112
 113 ;-----------------------------------------------------------------------------
 114
 115 BASIC_BUF       := $FA5E        ; Bank 1 location of command-line
 116 BASIC_BUF_LEN   = 162           ; Maximum length of command-line