mirror of https://github.com/a2stuff/vnIIc.git
573 lines
28 KiB
Plaintext
573 lines
28 KiB
Plaintext
ca65 V2.16 - Git f5e9b401
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Main file : client.s
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Current file: client.s
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000000r 1 ;;;-------------------------------------------------------------------
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000000r 1 ;;;
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000000r 1 ;;; vnIIc Client Application
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000000r 1 ;;;
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000000r 1 ;;;-------------------------------------------------------------------
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000000r 1
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000000r 1 PADDLE_SUPPORT = 1
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000000r 1 ;;; MOUSE_SUPPORT = 1
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000000r 1
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000000r 1 .include "apple2.inc"
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000000r 2
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000000r 2 ;-----------------------------------------------------------------------------
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000000r 2 ; Zero page stuff
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000000r 2
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000000r 2 WNDLFT := $20 ; Text window left
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000000r 2 WNDWDTH := $21 ; Text window width
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000000r 2 WNDTOP := $22 ; Text window top
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000000r 2 WNDBTM := $23 ; Text window bottom+1
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000000r 2 CH := $24 ; Cursor horizontal position
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000000r 2 CV := $25 ; Cursor vertical position
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000000r 2 BASL := $28 ; Text base address low
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000000r 2 BASH := $29 ; Text base address high
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000000r 2 INVFLG := $32 ; Normal/inverse(/flash)
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000000r 2 PROMPT := $33 ; Used by GETLN
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000000r 2 RNDL := $4E ; Random counter low
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000000r 2 RNDH := $4F ; Random counter high
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000000r 2 HIMEM := $73 ; Highest available memory address+1
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000000r 2
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000000r 2 ;-----------------------------------------------------------------------------
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000000r 2 ; Vectors
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000000r 2
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000000r 2 DOSWARM := $03D0 ; DOS warmstart vector
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000000r 2 BRKVec := $03F0 ; Break vector
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000000r 2 SOFTEV := $03F2 ; Vector for warm start
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000000r 2 PWREDUP := $03F4 ; This must be = EOR #$A5 of SOFTEV+1
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000000r 2
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000000r 2 ;-----------------------------------------------------------------------------
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000000r 2 ; Hardware
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000000r 2
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000000r 2 ; Keyboard input
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000000r 2 KBD := $C000 ; Read keyboard
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000000r 2 KBDSTRB := $C010 ; Clear keyboard strobe
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000000r 2
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000000r 2 ; 80 column video switches
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000000r 2 CLR80COL:= $C000 ; Disable 80 column store
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000000r 2 SET80COL:= $C001 ; Enable 80 column store
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000000r 2 RD80COL := $C018 ; >127 if 80 column store enabled
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000000r 2 RD80VID := $C01F ; >127 if 80 column video enabled
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000000r 2
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000000r 2 ; Character set switches
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000000r 2 CLRALTCHAR := $C00E ; Normal Apple II char set
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000000r 2 SETALTCHAR := $C00F ; Norm/inv LC, no flash
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000000r 2 ALTCHARSET := $C01E ; >127 if alt charset switched in
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000000r 2
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000000r 2 ; Language card switches
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000000r 2 RDLCBNK2:= $C011 ; >127 if LC bank 2 in use
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000000r 2 RDLCRAM := $C012 ; >127 if LC is read enabled
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000000r 2 ROMIN := $C081 ; Swap in D000-FFFF ROM
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000000r 2 LCBANK2 := $C083 ; Swap in LC bank 2
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000000r 2 LCBANK1 := $C08B ; Swap in LC bank 1
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000000r 2
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000000r 2 ; Video mode switches
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000000r 2 TXTCLR := $C050 ; Display graphics
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000000r 2 TXTSET := $C051 ; Display text
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000000r 2 MIXCLR := $C052 ; Disable 4 lines of text
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000000r 2 MIXSET := $C053 ; Enable 4 lines of text
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000000r 2 LOWSCR := $C054 ; Page 1
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000000r 2 HISCR := $C055 ; Page 2
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000000r 2 LORES := $C056 ; Lores graphics
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000000r 2 HIRES := $C057 ; Hires graphics
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000000r 2
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000000r 2 ; Game controller
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000000r 2 BUTN0 := $C061 ; Open-Apple Key
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000000r 2 BUTN1 := $C062 ; Closed-Apple Key
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000000r 2
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000000r 1
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000000r 1 .include "macros.inc"
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000000r 2 ;;;---------------------------------------------------------
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000000r 2 ;;;
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000000r 2 ;;; Generic Macros
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000000r 2 ;;;
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000000r 2 ;;;---------------------------------------------------------
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000000r 2
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000000r 2 .macro SaveRegisters
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000000r 2 pha
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000000r 2 txa
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000000r 2 pha
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000000r 2 tya
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000000r 2 pha
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000000r 2 .endmacro
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000000r 2
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000000r 2 .macro RestoreRegisters
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000000r 2 pla
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000000r 2 tay
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000000r 2 pla
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000000r 2 tax
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000000r 2 pla
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000000r 2 .endmacro
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000000r 2
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000000r 1
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000000r 1 ;;;---------------------------------------------------------
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000000r 1 ;;; Hi-res graphics constants/locations
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000000r 1 ;;;---------------------------------------------------------
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000000r 1
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000000r 1 PAGE := $E6 ; Active hires plotting page (Applesoft)
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000000r 1 PAGE1 := $20
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000000r 1 PAGE2 := $40
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000000r 1
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000000r 1 PAGESIZE := $20 ; Size of hi-res screen in pages
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000000r 1
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000000r 1 ;;;---------------------------------------------------------
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000000r 1 ;;; ROM routines
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000000r 1 ;;;---------------------------------------------------------
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000000r 1
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000000r 1 PREAD := $FB1E ; Monitor paddle reading routine, call
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000000r 1 ; with paddle # in X, returns value in Y
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000000r 1
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000000r 1 HCLR := $F3F2 ; Clear current hires screen to black
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000000r 1
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000000r 1 ;;;---------------------------------------------------------
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000000r 1 ;;; Other
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000000r 1 ;;;---------------------------------------------------------
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000000r 1
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000000r 1 MAX_SLOT := 7 ; Maximum slot # on an Apple II
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000000r 1
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000000r 1 ZP_PTR := $FA ; Write cursor location on zero page
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000000r 1
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000000r 1 ;;;-------------------------------------------------------------------
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000000r 1 ;;; Protocol:
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000000r 1 ;;;-------------------------------------------------------------------
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000000r 1
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000000r 1 .proc Protocol
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000000r 1 Keyboard := $00
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000000r 1
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000000r 1 Button0 := $10
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000000r 1 Button1 := $11
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000000r 1
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000000r 1 Paddle0 := $20
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000000r 1 Paddle1 := $21
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000000r 1
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000000r 1 MouseX := $30
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000000r 1 MouseY := $31
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000000r 1 MouseBtn := $32
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000000r 1
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000000r 1 Screen := $80
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000000r 1 .endproc
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000000r 1
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000000r 1
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000000r 1 ;;;-------------------------------------------------------------------
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000000r 1 ;;;
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000000r 1 ;;; Client Code
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000000r 1 ;;;
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000000r 1 ;;;-------------------------------------------------------------------
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000000r 1
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000000r 1 .org $6000
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006000 1 4C 5B 60 jmp AppEntry
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006003 1
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006003 1 .include "ssc.inc"
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006003 2 ;;;-------------------------------------------------------------------
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006003 2 ;;;
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006003 2 ;;; Serial port routines
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006003 2 ;;;
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006003 2 ;;; (based on ADTPro)
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006003 2 ;;;
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006003 2 ;;;-------------------------------------------------------------------
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006003 2
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006003 2 .proc SSC
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006003 2
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006003 2 ;;;---------------------------------------------------------
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006003 2 ;;; Super Serial constants/locations
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006003 2 ;;;---------------------------------------------------------
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006003 2
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006003 2 ;;; These get incremented by the slot where they appear
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006003 2 UACTRL = $C08B ; Control Register
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006003 2 UACMND = $C08A ; Command Register
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006003 2 UASTAT = $C089 ; Status Register
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006003 2 UADATA = $C088 ; Data Register - incoming and outgoing data
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006003 2
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006003 2 ;;; Lookup table for UACTRL register, by baud rate
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006003 2
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006003 2 16 1E 1F 10 BPSCTRL: .byte $16,$1E,$1F,$10 ; 300, 9600, 19200, 115k (with 8 data bits, 1 stop bit, no echo)
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006007 2 .enum
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006007 2 BPS_300
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006007 2 BPS_9600
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006007 2 BPS_19200
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006007 2 BPS_115k
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006007 2 .endenum
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006007 2
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006007 2 CMND_NRDI = $0B ; Command: no parity, RTS on, DTR on, no interrupts
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006007 2
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006007 2
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006007 2 ;;;---------------------------------------------------------
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006007 2 ;;; Initialize the SSC; slot passed in A
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006007 2
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006007 2 .proc Init
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006007 2 0A asl ; Slot passed in A
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006008 2 0A asl
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006009 2 0A asl
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00600A 2 0A asl ; Now $S0
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00600B 2 69 88 adc #$88 ; Low byte of UADATA
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00600D 2 AA tax
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00600E 2 A9 0B lda #CMND_NRDI ; Command register: no parity, RTS on, DTR on, no interrupts
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006010 2 9D 02 C0 sta $C002,X
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006013 2 AC 58 60 ldy PSPEED ; Control register: look up by baud rate (8 data bits, 1 stop bit)
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006016 2 B9 03 60 lda BPSCTRL,Y
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006019 2 9D 03 C0 sta $C003,X
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00601C 2 8E 3C 60 stx MOD_UADATA_1 ; Modify references to
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00601F 2 8E 49 60 stx MOD_UADATA_2 ; UADATA to point at
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006022 2 8E 55 60 stx MOD_UADATA_3 ; correct slot (UADATA+S0)
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006025 2 E8 inx
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006026 2 8E 32 60 stx MOD_UASTAT_1 ; Modify reference to
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006029 2 8E 40 60 stx MOD_UASTAT_2 ; UASTAT to point at
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00602C 2 8E 4D 60 stx MOD_UASTAT_3 ; correct slot (UASTAT+S0)
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00602F 2 60 rts
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006030 2 .endproc
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006030 2
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006030 2
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006030 2 ;;;---------------------------------------------------------
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006030 2 ;;; Send accumulator out the serial port
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006030 2
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006030 2 .proc Put
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006030 2 48 pha ; Push A onto the stack
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006031 2 MOD_UASTAT_1 := *+1
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006031 2 AD 89 C0 : lda UASTAT ; Check status bits
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006034 2 29 70 and #$70
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006036 2 C9 10 cmp #$10
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006038 2 D0 F7 bne :- ; Output register is full, so loop
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00603A 2 68 pla
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00603B 2 MOD_UADATA_1 := *+1
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00603B 2 8D 88 C0 sta UADATA ; Put character
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00603E 2 60 rts
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00603F 2 .endproc
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00603F 2 MOD_UASTAT_1 := Put::MOD_UASTAT_1
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00603F 2 MOD_UADATA_1 := Put::MOD_UADATA_1
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00603F 2
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00603F 2 ;;;---------------------------------------------------------
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00603F 2 ;;; Read a character from the serial port to the accumulator
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00603F 2
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00603F 2 .proc Get
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00603F 2 MOD_UASTAT_2 := *+1
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00603F 2 AD 89 C0 lda UASTAT ; Check status bits
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006042 2 29 68 and #$68
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006044 2 C9 08 cmp #$8
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006046 2 D0 F7 bne Get ; Input register empty, loop
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006048 2 MOD_UADATA_2 := *+1
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006048 2 AD 88 C0 lda UADATA ; Get character
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00604B 2 60 rts
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00604C 2 .endproc
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00604C 2 MOD_UASTAT_2 := Get::MOD_UASTAT_2
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00604C 2 MOD_UADATA_2 := Get::MOD_UADATA_2
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00604C 2
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00604C 2 ;;;---------------------------------------------------------
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00604C 2 ;;; Check if the serial port has pending data
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00604C 2
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00604C 2 .proc HasData
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00604C 2 MOD_UASTAT_3 := *+1
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00604C 2 AD 89 C0 lda UASTAT ; Check status bits
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00604F 2 29 68 and #$68
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006051 2 C9 08 cmp #$8
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006053 2 60 rts
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006054 2 .endproc
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006054 2 MOD_UASTAT_3 := HasData::MOD_UASTAT_3
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006054 2
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006054 2
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006054 2 ;;;---------------------------------------------------------
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006054 2 ;;; Clean up serial port
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006054 2
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006054 2 .proc Reset
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006054 2 MOD_UADATA_3 := *+1
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006054 2 2C 88 C0 bit UADATA
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006057 2 60 rts
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006058 2 .endproc
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006058 2 MOD_UADATA_3 := Reset::MOD_UADATA_3
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006058 2
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006058 2 .endproc
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006058 2
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006058 1
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006058 1 .ifdef MOUSE_SUPPORT
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006058 1 .include "mouse.inc"
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006058 1 .endif
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006058 1
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006058 1
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006058 1 ;;;-------------------------------------------------------------------
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006058 1 ;;; Variables
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006058 1 ;;;-------------------------------------------------------------------
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006058 1
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006058 1 ;;; Application configuration
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006058 1 03 PSPEED: .byte SSC::BPS_115k ; Hardcoded for Apple IIc (TODO: Allow configuration)
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006059 1 02 PSLOT: .byte 2 ; Hardcoded for Apple IIc (TODO: Allow configuration)
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00605A 1 00 PEXIT: .byte 0 ; Set when it's time to exit (Not Yet Implemented)
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00605B 1
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00605B 1
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00605B 1 ;;;---------------------------------------------------------
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00605B 1 ;;; Initialize the application, and enter the main loop
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00605B 1
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00605B 1 .proc AppEntry
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00605B 1 AD 59 60 lda PSLOT ; Use slot 2
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00605E 1 20 07 60 jsr SSC::Init ; Initialize Super Serial Card
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006061 1 20 2B 61 jsr InitHires ; Initialize Hi-Res graphics
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006064 1 20 A5 60 jsr InitInput ; Initialize input devices
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006067 1 20 74 60 jsr MainLoop
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00606A 1 ;; fall through
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00606A 1 .endproc
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00606A 1
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00606A 1 ;;;---------------------------------------------------------
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00606A 1 ;;; Clean up and exit app
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00606A 1
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00606A 1 .proc AppExit
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00606A 1 20 54 60 jsr SSC::Reset
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00606D 1 8D 54 C0 sta LOWSCR
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006070 1 8D 51 C0 sta TXTSET
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006073 1 60 rts
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006074 1 .endproc
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006074 1
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006074 1 ;;;-------------------------------------------------------------------
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006074 1 ;;;
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006074 1 ;;; Main loop functionality
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006074 1 ;;;
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006074 1 ;;;-------------------------------------------------------------------
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006074 1
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006074 1
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006074 1 ;;;---------------------------------------------------------
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006074 1 .proc MainLoop
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006074 1
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006074 1 ;;; TODO: Sort out the protocol - should be able to send
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006074 1 ;;; input state without receiving data
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006074 1 ;;; jsr SSC::HasData ; Anything to read?
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006074 1 ;;; bne :+ ; Nope
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006074 1
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006074 1 20 7E 60 : jsr ReceivePage
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006077 1 ;; Input is sent every 256 bytes (32 times per page)
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006077 1 20 42 61 jsr FlipHires
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00607A 1
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00607A 1 4C 74 60 jmp :- ; TODO: define an exit trigger
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00607D 1 60 rts
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00607E 1 .endproc
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00607E 1
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00607E 1
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00607E 1 ;;;---------------------------------------------------------
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00607E 1 ;;; Pull a hi-res page down over serial
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00607E 1 ;;;
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00607E 1 ;;; Protocol is:
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00607E 1 ;;; * Recieve 256 bytes (graphic data)
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00607E 1 ;;; * Send 1 byte (input state)
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00607E 1
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00607E 1 .proc ReceivePage
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00607E 1 A9 80 lda #Protocol::Screen
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006080 1 20 30 60 jsr SSC::Put
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006083 1 A9 00 lda #0 ; data size
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006085 1 20 30 60 jsr SSC::Put
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006088 1
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006088 1
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006088 1 A9 00 lda #0 ; set up write pointer
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00608A 1 85 FA sta ZP_PTR
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00608C 1 A5 E6 lda PAGE
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00608E 1 85 FB sta ZP_PTR+1
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006090 1 A2 20 ldx #PAGESIZE ; plan to receive this many pages
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006092 1 A0 00 ldy #0
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006094 1
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006094 1 20 3F 60 : jsr SSC::Get
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006097 1 91 FA sta (ZP_PTR),Y
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006099 1 C8 iny
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00609A 1 D0 F8 bne :- ; Do a full page...
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00609C 1
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00609C 1 ;; Interleave to maintain responsiveness
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00609C 1 20 A6 60 jsr SendInputState
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00609F 1
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00609F 1 E6 FB inc ZP_PTR+1
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0060A1 1 CA dex
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0060A2 1 D0 F0 bne :- ; ...as many pages as we need
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0060A4 1 60 rts
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0060A5 1 .endproc
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0060A5 1
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0060A5 1
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0060A5 1 ;;;-------------------------------------------------------------------
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0060A5 1 ;;;
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0060A5 1 ;;; Input device routines
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0060A5 1 ;;;
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0060A5 1 ;;;-------------------------------------------------------------------
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0060A5 1
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0060A5 1 ;;;---------------------------------------------------------
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0060A5 1 ;;; Initialize input devices and storage for detecting
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0060A5 1 ;;; state transitions
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0060A5 1
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0060A5 1 .proc InitInput
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0060A5 1
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0060A5 1 .ifdef MOUSE_SUPPORT
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0060A5 1 jsr Mouse::FindMouse
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0060A5 1 .endif
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0060A5 1
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0060A5 1 60 rts
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0060A6 1 .endproc
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0060A6 1
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0060A6 1
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0060A6 1 ;;;---------------------------------------------------------
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0060A6 1 ;;; Send a full set of input state updates.
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0060A6 1
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0060A6 1 ;;; Assumes time to transmit is roughly comparable to time
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0060A6 1 ;;; to measure input state, therefore only sending changes is
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0060A6 1 ;;; not worthwhile in most cases.
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0060A6 1
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0060A6 1 .proc SendInputState
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0060A6 1 20 B0 60 jsr MaybeSendKeyboard
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0060A9 1 20 E3 60 jsr SendButtons
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0060AC 1
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0060AC 1 .ifdef PADDLE_SUPPORT
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0060AC 1 20 04 61 jsr SendPaddles
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0060AF 1 .endif
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0060AF 1
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0060AF 1 .ifdef MOUSE_SUPPORT
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0060AF 1 jsr SendMouse
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0060AF 1 .endif
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0060AF 1
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0060AF 1 .endproc
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0060AF 1
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0060AF 1
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0060AF 1 ;;;------------------------------------------------------------
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0060AF 1 ;;; Keyboard
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0060AF 1
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0060AF 1 ;;; NOTE: Can't use KBDSTRB to detect key up -> key down transition
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0060AF 1 ;;; since the msb can change before the key code. Instead, consider
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0060AF 1 ;;; these cases:
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0060AF 1 ;;;
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0060AF 1 ;;; OLD STATE KBD KBDSTRB RESULT
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0060AF 1 ;;; Up Up - No-op
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0060AF 1 ;;; Up Down - Save and send key down
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0060AF 1 ;;; Down - Up Save and send key up
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0060AF 1 ;;; Down - Down Save and send key ONLY if different
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0060AF 1 ;;;
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0060AF 1
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0060AF 1 00 last_kb: .byte 0
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0060B0 1
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0060B0 1 .proc MaybeSendKeyboard
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0060B0 1 AD AF 60 lda last_kb
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0060B3 1 D0 08 bne key_was_down
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0060B5 1
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0060B5 1 key_was_up:
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0060B5 1 ;; Key was up - send only if now down.
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0060B5 1 AD 00 C0 lda KBD ; Read keyboard
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0060B8 1 10 28 bpl done ; Do nothing if it is still up.
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0060BA 1 4C CF 60 jmp send ; Otherwise send.
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0060BD 1
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0060BD 1 key_was_down:
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0060BD 1 ;; Key was down - strobe should match
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0060BD 1 ;; unless the key changed or was released.
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0060BD 1 AD 10 C0 lda KBDSTRB
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0060C0 1 30 05 bmi kbdstrb_down
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0060C2 1
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0060C2 1 kbdstrb_up:
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0060C2 1 A9 00 lda #0 ; Now released
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0060C4 1 4C CF 60 jmp send
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0060C7 1
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0060C7 1 kbdstrb_down:
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0060C7 1 CD AF 60 cmp last_kb ; Same key as last time?
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0060CA 1 F0 16 beq done ; - no change, don't send.
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0060CC 1 4C CF 60 jmp send
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0060CF 1
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0060CF 1 8D AF 60 send: sta last_kb
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0060D2 1 A5 00 lda Protocol::Keyboard
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|
0060D4 1 20 30 60 jsr SSC::Put
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|
0060D7 1 A9 01 lda #1 ; Data size
|
|
0060D9 1 20 30 60 jsr SSC::Put
|
|
0060DC 1 AD AF 60 lda last_kb
|
|
0060DF 1 20 30 60 jsr SSC::Put
|
|
0060E2 1
|
|
0060E2 1 60 done: rts
|
|
0060E3 1 .endproc
|
|
0060E3 1
|
|
0060E3 1 ;;;------------------------------------------------------------
|
|
0060E3 1 ;;; Buttons
|
|
0060E3 1
|
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0060E3 1 .proc SendButtons
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|
0060E3 1
|
|
0060E3 1 A5 10 lda Protocol::Button0
|
|
0060E5 1 20 30 60 jsr SSC::Put
|
|
0060E8 1 A9 01 lda #1 ; Data size
|
|
0060EA 1 20 30 60 jsr SSC::Put
|
|
0060ED 1 AD 61 C0 lda BUTN0
|
|
0060F0 1 20 30 60 jsr SSC::Put
|
|
0060F3 1
|
|
0060F3 1 A5 11 lda Protocol::Button1
|
|
0060F5 1 20 30 60 jsr SSC::Put
|
|
0060F8 1 A9 01 lda #1 ; Data size
|
|
0060FA 1 20 30 60 jsr SSC::Put
|
|
0060FD 1 AD 62 C0 lda BUTN1
|
|
006100 1 20 30 60 jsr SSC::Put
|
|
006103 1
|
|
006103 1 60 rts
|
|
006104 1 .endproc
|
|
006104 1
|
|
006104 1 ;;;------------------------------------------------------------
|
|
006104 1 ;;; Paddles
|
|
006104 1
|
|
006104 1 .ifdef PADDLE_SUPPORT
|
|
006104 1 .proc SendPaddles
|
|
006104 1
|
|
006104 1 A5 20 lda Protocol::Paddle0
|
|
006106 1 20 30 60 jsr SSC::Put
|
|
006109 1 A9 01 lda #1 ; Data size
|
|
00610B 1 20 30 60 jsr SSC::Put
|
|
00610E 1
|
|
00610E 1 A2 00 ldx #0
|
|
006110 1 20 1E FB jsr PREAD
|
|
006113 1 98 tya
|
|
006114 1 20 30 60 jsr SSC::Put
|
|
006117 1
|
|
006117 1 ;; Assumes at least 11 cycles to send, so
|
|
006117 1 ;; timer has a chance to reset.
|
|
006117 1
|
|
006117 1 A5 21 lda Protocol::Paddle1
|
|
006119 1 20 30 60 jsr SSC::Put
|
|
00611C 1 A9 01 lda #1 ; Data size
|
|
00611E 1 20 30 60 jsr SSC::Put
|
|
006121 1
|
|
006121 1 A2 01 ldx #1
|
|
006123 1 20 1E FB jsr PREAD
|
|
006126 1 98 tya
|
|
006127 1 20 30 60 jsr SSC::Put
|
|
00612A 1
|
|
00612A 1 60 rts
|
|
00612B 1 .endproc
|
|
00612B 1 .endif
|
|
00612B 1
|
|
00612B 1 ;;;-------------------------------------------------------------------
|
|
00612B 1 ;;;
|
|
00612B 1 ;;; Hi-res graphics routines
|
|
00612B 1 ;;;
|
|
00612B 1 ;;;-------------------------------------------------------------------
|
|
00612B 1
|
|
00612B 1 ;;;---------------------------------------------------------
|
|
00612B 1 ;;; Set up the graphics display and pointers
|
|
00612B 1
|
|
00612B 1 .proc InitHires
|
|
00612B 1 A9 20 lda #PAGE1 ; clear page 1
|
|
00612D 1 85 E6 sta PAGE
|
|
00612F 1 20 F2 F3 jsr HCLR
|
|
006132 1
|
|
006132 1 20 42 61 jsr FlipHires ; then show it and flip to 2
|
|
006135 1 8D 57 C0 sta HIRES
|
|
006138 1 8D 50 C0 sta TXTCLR
|
|
00613B 1 8D 52 C0 sta MIXCLR
|
|
00613E 1 8D 54 C0 sta LOWSCR
|
|
006141 1
|
|
006141 1 60 rts
|
|
006142 1 .endproc
|
|
006142 1
|
|
006142 1
|
|
006142 1 ;;;---------------------------------------------------------
|
|
006142 1 ;;; Call when done with the current plotting page
|
|
006142 1 ;;; (selected in PAGE) and it will be shown and the
|
|
006142 1 ;;; other page will be shown.
|
|
006142 1
|
|
006142 1 .proc FlipHires
|
|
006142 1 A5 E6 lda PAGE ; plotting on which page?
|
|
006144 1 C9 20 cmp #PAGE1
|
|
006146 1 F0 08 beq :+
|
|
006148 1
|
|
006148 1 8D 55 C0 sta HISCR ; page 2 - so show it
|
|
00614B 1 A9 20 lda #PAGE1 ; and plot on page 1
|
|
00614D 1 85 E6 sta PAGE
|
|
00614F 1 60 rts
|
|
006150 1
|
|
006150 1 8D 54 C0 : sta LOWSCR ; page 1 - so show it
|
|
006153 1 A9 40 lda #PAGE2 ; and plot on page 2
|
|
006155 1 85 E6 sta PAGE
|
|
006157 1 60 rts
|
|
006158 1 .endproc
|
|
006158 1
|