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57fd14b0b3
In CURSOR!, I was using a write commande to read from VRAM and the emulator didn't properly behave and did as if everything was fine. The result on a real SMS was that the cursor would contain the inverted glyph of the contents of the *old* cursor position.
28 lines
653 B
C
28 lines
653 B
C
#pragma once
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#include <stdint.h>
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#include <stdbool.h>
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#define TMS_VRAM_SIZE 0x4000
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// Offset of the name table
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#define TMS_NTABLE_OFFSET 0x3800
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typedef struct {
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uint8_t vram[TMS_VRAM_SIZE];
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uint8_t regs[0x10];
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uint8_t cmdlsb;
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bool has_cmdlsb;
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uint16_t curaddr;
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uint8_t databuf;
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uint16_t width; // in pixels
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uint16_t height; // in pixels
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} TMS9918;
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void tms_init(TMS9918 *tms);
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uint8_t tms_cmd_rd(TMS9918 *tms);
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void tms_cmd_wr(TMS9918 *tms, uint8_t val);
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uint8_t tms_data_rd(TMS9918 *tms);
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void tms_data_wr(TMS9918 *tms, uint8_t val);
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// result is a RGB value
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uint8_t tms_pixel(TMS9918 *tms, uint16_t x, uint16_t y);
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