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https://github.com/mgcaret/of816.git
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53 lines
1.7 KiB
PHP
53 lines
1.7 KiB
PHP
; *** Direct page equates ***
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.pushseg
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.zeropage
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STACKBASE = $00 ; normally 0
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ZR = $00 ; 0 four scratch cells
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WR = ZR+4 ; 4
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XR = WR+4 ; 8
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YR = XR+4 ; c
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IP = YR+4 ; 10 instruction pointer
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STK_BTM = IP+4 ; 14 lowest bank 0 address usable for stack
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STK_TOP = STK_BTM+2 ; 16 bank 0 address immediately after the upper stack cell
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RSTK_TOP = STK_TOP+2 ; 18 return stack top
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SYS_RSTK = RSTK_TOP+2 ; 1a system return stack pointer
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DHERE = SYS_RSTK+2 ; 1c HERE system variable
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MEM_BTM = DHERE+4 ; 20 System memory bottom
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MEM_TOP = MEM_BTM+4 ; 24 System memory top
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SYSVARS = MEM_TOP+4 ; 28 Pointer to system variables
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RSTK_SAVE = SYSVARS+4 ; 2c return stack saved for current CATCH level
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CATCHFLAG = RSTK_SAVE+2 ; 2e active catch counter
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SYSIF = CATCHFLAG+2 ; 30 system interface vector, 4 bytes
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DP_END = SYSIF+4 ; 34 must be last so platform libs can used DP
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;TMP1 = SYSIF+4 ; 34 temp for ENTER
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;DP_END = TMP1+2 ; 36 must be last so platform libs can use DP
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.popseg
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; *** system interface function codes ***
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SI_PRE_INIT = $0000
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SI_POST_INIT = $0001
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SI_EMIT = $0002
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SI_KEYQ = $0003
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SI_KEY = $0004
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SI_GET_FCODE = $0005
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SI_RESET_ALL = $0006
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; *** Constants ***
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opJSL = $22
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opJML = $5C
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c_bell = $07
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c_bs = $08
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c_cr = $0D
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c_lf = $0A
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c_page = $0C
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c_del = $7F
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; *** Processor ***
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RESETV = $FFFC
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; *** System Info ***
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.define VERSION "0.1"
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