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120 lines
2.5 KiB
PHP
120 lines
2.5 KiB
PHP
;
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; Zero page variables and I/O definitions for the CBM 610
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;
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; Taken from a kernal disassembly done by myself in 1987.
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;
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; 1998-09-28, Ullrich von Bassewitz
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; 2014-04-02, Greg King
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; ---------------------------------------------------------------------------
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; Zeropage stuff
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ExecReg := $00 ; Controls execution memory bank
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IndReg := $01 ; Controls indirect indexed load-store bank
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TXTPTR := $85 ; Far pointer into BASIC source code
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FNAM := $90 ; Far pointer to LOAD/SAVE file-name
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FNAM_LEN := $9D ; Holds length of file-name
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; ---------------------------------------------------------------------------
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; Screen size
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XSIZE = 80
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YSIZE = 25
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; ---------------------------------------------------------------------------
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; I/O definitions
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; I/O $d800: CRTC 6545
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.struct CRTC
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ADDR .byte
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DATA .byte
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.endstruct
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; I/O $db00: CIA 6526, Inter Process Communication
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;
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; IPCcia = $db00
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.struct CIA
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PRA .byte
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PRB .byte
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DDRA .byte
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DDRB .byte
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.union
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.struct
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TALO .byte
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TAHI .byte
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.endstruct
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TA .word
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.endunion
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.union
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.struct
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TBLO .byte
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TBHI .byte
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.endstruct
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TB .word
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.endunion
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TOD10 .byte
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TODSEC .byte
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TODMIN .byte
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TODHR .byte
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SDR .byte
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ICR .byte
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CRA .byte
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CRB .byte
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.endstruct
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; I/O $dc00: CIA 6526
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;
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; cia = $dc00
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; I/O $dd00: ACIA 6551
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;
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; acia = $dd00
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.struct ACIA
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DATA .byte
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STATUS .byte
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CMD .byte
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CTRL .BYTE
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.endstruct
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; I/O $de00: Triport #1 6525
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;
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; tpi1 = $de00
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.struct TPI
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PRA .byte
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PRB .byte
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.union
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PRC .byte
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INT .byte
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.endunion
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DDRA .byte
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DDRB .byte
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.union
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DDRC .byte
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IMR .byte
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.endunion
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CR .byte
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AIR .byte
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.endstruct
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; I/O $df00: Triport #2 6525
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; tpi2 = $df00
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;-----------------------------------------------------------------------------
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BASIC_BUF := $FA5E ; Bank 1 location of command-line
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BASIC_BUF_LEN = 162 ; Maximum length of command-line
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