65a9d17674
* Enables [Fn]+key combinations (using right-Ctrl or right-Alt as [Fn]). In particular: * Implements switching the built-in display adapter between the 'internal' plasma display ([Fn]+[Home]) and an 'external' CGA monitor ([Fn]+[End]) * Allows the video font to be toggled between thin and thick ([Fn]+[Right arrow]). * Implements the four hardware fonts of the original, selectable in BIOS setup. * Implements CRTC register 12h (attribute mapping and display type) Patch from John Elliott
45 lines
1 KiB
C
45 lines
1 KiB
C
typedef struct cga_t
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{
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mem_mapping_t mapping;
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int crtcreg;
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uint8_t crtc[32];
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uint8_t cgastat;
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uint8_t cgamode, cgacol;
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int fontbase;
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int linepos, displine;
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int sc, vc;
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int cgadispon;
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int con, coff, cursoron, cgablink;
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int vsynctime, vadj;
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uint16_t ma, maback;
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int oddeven;
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int dispontime, dispofftime;
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int vidtime;
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int firstline, lastline;
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int drawcursor;
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uint8_t *vram;
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uint8_t charbuffer[256];
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int revision;
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int composite;
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int snow_enabled;
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} cga_t;
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void cga_init(cga_t *cga);
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void cga_out(uint16_t addr, uint8_t val, void *p);
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uint8_t cga_in(uint16_t addr, void *p);
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void cga_write(uint32_t addr, uint8_t val, void *p);
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uint8_t cga_read(uint32_t addr, void *p);
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void cga_recalctimings(cga_t *cga);
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void cga_poll(void *p);
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extern device_t cga_device;
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