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stat -> status; improve MDA register decoding; add MDA CRTC, register and mode enums

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This commit is contained in:
starfrost013
2025-06-11 17:37:15 +01:00
parent dd6f7746a9
commit 317a5b7ade
16 changed files with 220 additions and 147 deletions
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2
src/include/86box/m_pcjr.h
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@@ -30,7 +30,7 @@ typedef struct pcjr_s
uint8_t array[32];
int array_ff;
int memctrl;
uint8_t stat;
uint8_t status;
int addr_mode;
uint8_t *vram;
uint8_t *b8000;

2
src/include/86box/m_tandy.h
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@@ -27,7 +27,7 @@ typedef struct t1kvid_t {
int memctrl;
uint8_t mode;
uint8_t col;
uint8_t stat;
uint8_t status;
uint8_t *vram;
uint8_t *b8000;

2
src/include/86box/vid_ega.h
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@@ -39,7 +39,7 @@ typedef struct ega_t {
uint8_t lb;
uint8_t lc;
uint8_t ld;
uint8_t stat;
uint8_t status;
uint8_t colourcompare;
uint8_t colournocare;
uint8_t scrblank;

2
src/include/86box/vid_hercules.h
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@@ -31,7 +31,7 @@ typedef struct {
uint8_t ctrl;
uint8_t ctrl2;
uint8_t stat;
uint8_t status;
uint64_t dispontime;
uint64_t dispofftime;

72
src/include/86box/vid_mda.h
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@@ -1,18 +1,78 @@
/* Copyright holders: Sarah Walker
see COPYING for more details
*/
/*
* 86Box A hypervisor and IBM PC system emulator that specializes in
* running old operating systems and software designed for IBM
* PC systems and compatibles from 1981 through fairly recent
* system designs based on the PCI bus.
*
* This file is part of the 86Box distribution.
*
* Emulation of the IBM Monochrome Display and Printer card.
*
* Authors: Sarah Walker, starfrost
*
* Copyright 2007-2024 Sarah Walker
* Copyright 2025 Connor Hyde / starfrost, <mario64crashed@gmail.com>
*/
#ifndef VIDEO_MDA_H
#define VIDEO_MDA_H
// Defines
#define MDA_CRTC_NUM_REGISTERS 32
// Enums & structures
typedef enum mda_registers_e
{
MDA_REGISTER_START = 0x3B0,
MDA_REGISTER_CRTC_INDEX = 0x3B4,
MDA_REGISTER_CRTC_DATA = 0x3B5,
MDA_REGISTER_MODE_CONTROL = 0x3B8,
MDA_REGISTER_CRT_STATUS = 0x3BA,
MDA_REGISTER_PARALLEL_DATA = 0x3BC,
MDA_REGISTER_PRINTER_STATUS = 0x3BD,
MDA_REGISTER_PRINTER_CONTROL = 0x3BE,
MDA_REGISTER_END = 0x3BF,
} mda_registers;
// Motorola MC6845 CRTC registers (without light pen for some reason)
typedef enum mda_crtc_registers_e
{
MDA_CRTC_HTOTAL = 0x0, // Horizontal total (total number of characters incl. hsync)
MDA_CRTC_HDISP = 0x1, // Horizontal display
MDA_CRTC_HSYNC_POS = 0x2, // Horizontal position of horizontal ysnc
MDA_CRTC_HSYNC_WIDTH = 0x3, // Width of horizontal sync
MDA_CRTC_VTOTAL = 0x4, // Vertical total (total number of scanlines incl. vsync)
MDA_CRTC_VTOTAL_ADJUST = 0x5, // Vertical total adjust value
MDA_CRTC_VDISP = 0x6, // Vertical display (total number of displayed scanline)
MDA_CRTC_VSYNC = 0x7, // Vertical sync scanline number
MDA_CRTC_INTERLACE = 0x8, // Interlacing mode
MDA_CRTC_MAX_SCANLINE_ADDR = 0x9, // Maximum scanline address
MDA_CRTC_CURSOR_START = 0xA, // Cursor start scanline
MDA_CRTC_CURSOR_END = 0xB, // Cursor end scanline
MDA_CRTC_START_ADDR_HIGH = 0xC, // Screen start address high 8 bits
MDA_CRTC_START_ADDR_LOW = 0xD, // Screen start address low 8 bits
MDA_CRTC_CURSOR_ADDR_HIGH = 0xE, // Cursor address high 8 bits
MDA_CRTC_CURSOR_ADDR_LOW = 0xF, // Cursor address low 8 bits
} mda_crtc_registers;
typedef enum mda_mode_flags_e
{
MDA_MODE_HIGHRES = 1 << 0,
MDA_MODE_VIDEO_ENABLE = 1 << 3,
MDA_MODE_BLINK = 1 << 5,
} mda_mode_flags;
typedef struct mda_t {
mem_mapping_t mapping;
uint8_t crtc[32];
uint8_t crtc[MDA_CRTC_NUM_REGISTERS];
int crtcreg;
uint8_t ctrl;
uint8_t stat;
uint8_t mode;
uint8_t status;
uint64_t dispontime;
uint64_t dispofftime;