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https://github.com/cc65/cc65.git
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b256d6fb46
machines, the program runs in a separate 64K bank, and zeropage variables need to be copied from the system bank into the execution bank to read by a simple load operation. The change is currently untested! git-svn-id: svn://svn.cc65.org/cc65/trunk@4597 b7a2c559-68d2-44c3-8de9-860c34a00d81
111 lines
1.9 KiB
PHP
111 lines
1.9 KiB
PHP
;
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; Zeropage 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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; Ullrich von Bassewitz, 28.09.1998
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; ---------------------------------------------------------------------------
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; Zeropage stuff
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ExecReg = $00
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IndReg = $01
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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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