Signetics 2650 & 2636 编程/教程代码
本书的这一部分包含了教程中使用的所有代码。
下面的代码必须在每个程序被组装之前附加到它。它包含将标签分配给所有硬件地址和相关常量的等式指令。这样做既是为了避免重复，也是为了确保本书中所有寄存器的标签一致。
这是一个标准的汇编指令块，它为系统中所有寄存器的常量和内存地址命名。注意，一些地址，例如 $1F00，有几个标签。这允许程序员使用最适合正在执行的任务的那个，作为帮助生成可读代码的工具。例如，如果所有 PVI 寄存器都被初始化为 0，请使用 pvi；如果设置对象 1 的形状和位置，请使用 'object1' 等。
; HARDWARE DEFINITIONS ; updated 11 Jan 2021 ;============================================================ ; PROCESSOR CONSTANTS ; ------------------- carrybit equ $01 compare equ $02 withcarry equ $08 registerselect equ $10 intinhibit equ $20 stackpointer equ $07 sense equ $80 flag equ $40 ; EFFECTS REGISTER ; ---------------- effects equ $1e80 ; BUTTONS ; -------- player1keys147c equ $1E88 ;player1 keypad, bits: 1,4,7,clear,x,x,x,x player1keys2580 equ $1E89 ;player1 keypad, bits: 2,5,8,0,x,x,x,x player1keys369e equ $1E8A ;player1 keypad, bits: 3,6,9,enter,x,x,x,x player2keys147c equ $1E8C ;player2 keypad, bits: 1,4,7,clear,x,x,x,x player2keys2580 equ $1E8D ;player2 keypad, bits: 2,5,8,0,x,x,x,x player2keys369e equ $1E8E ;player2 keypad, bits: 3,6,9,enter,x,x,x,x keymask123 equ $80 ;top row of keys keymask456 equ $40 keymask789 equ $20 keymaskc0e equ $10 ;bottom row of keys console equ $1E8B ;start and select buttons on console consolestart equ $40 consoleselect equ $80 ; PVI ADDRESSES AND CONSTANTS ; --------------------------- pvi equ $1F00 object1 equ $1F00 shape1 equ $1F00 hc1 equ $1F0A ; hc = Horizontal Coordinate hcd1 equ $1F0B ; hcd = Horizontal Coordinate Duplicate hcb1 equ $1F0B ; hcb = ditto (Signetics datasheet name) vc1 equ $1F0C ; vc = Vertical Coordinate voff1 equ $1F0D ; voff = Vertical Offset vcb1 equ $1F0D ; vcb = ditto (Signetics datasheet name) object2 equ $1F10 shape2 equ $1F10 hc2 equ $1F1A hcd2 equ $1F1B hcb2 equ $1FCB vc2 equ $1F1C voff2 equ $1F1D vcb2 equ $1F1D object3 equ $1F20 shape3 equ $1F20 hc3 equ $1F2A hcd3 equ $1F2B hcb3 equ $1F2B vc3 equ $1F2C voff3 equ $1F2D vcb3 equ $1F2D object4 equ $1F40 shape4 equ $1F40 hc4 equ $1F4A hcd4 equ $1F4B hcb4 equ $1F4B vc4 equ $1F4C voff4 equ $1F4D vcb4 equ $1F4D grid equ $1F80 ; background grid vbars equ $1F80 ; vertical bar definitions hbars equ $1FA8 ; horizontal bar extensions objectsize equ $1FC0 colours12 equ $1FC1 ; colour objects 1,2 colours34 equ $1FC2 ; colour objects 3,4 coloursback equ $1FC6 ; background grid colour / background grid enable / screen colour backgnd equ $1FC6 ; deprecated pitch equ $1FC7 scoreformat equ $1FC3 score12 equ $1FC8 score34 equ $1FC9 objectstatus equ $1FCA ; object-background collision / object complete obj1complete equ $08 obj2complete equ $04 obj3complete equ $02 obj4complete equ $01 collisions equ $1FCB ; VRLE / inter-object collision vrle equ $40 adpot1 equ $1FCC adpot2 equ $1FCD