Signetics 2650 & 2636 程式設計/教程程式碼
本書的這一部分包含了教程中使用的所有程式碼。
下面的程式碼必須在每個程式被組裝之前附加到它。它包含將標籤分配給所有硬體地址和相關常量的等式指令。這樣做既是為了避免重複，也是為了確保本書中所有暫存器的標籤一致。
這是一個標準的彙編指令塊，它為系統中所有暫存器的常量和記憶體地址命名。注意，一些地址，例如 $1F00，有幾個標籤。這允許程式設計師使用最適合正在執行的任務的那個，作為幫助生成可讀程式碼的工具。例如，如果所有 PVI 暫存器都被初始化為 0，請使用 pvi；如果設定物件 1 的形狀和位置，請使用 '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