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Merge pull request #5902 from OPNA2608/fix/kcg-bios-setting

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Allow controlling K-CG via BIOS interrupt
This commit is contained in:
Jonathan Campbell
2025-10-11 11:30:04 -07:00
committed by GitHub
parent 0fb30bdad9 6b06d3fba4
commit 64ba6132ce
1 changed files with 6 additions and 4 deletions
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10
src/ints/bios.cpp
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@@ -141,6 +141,9 @@ extern bool enable_fpu;
extern bool finish_prepare;
extern bool is_ttfswitched_on;
/* vga_pc98_cg.cpp */
extern bool pc98_cg_kanji_dot_access_mode;
bool pc98_timestamp5c = true; // port 5ch and 5eh "time stamp/hardware wait"
uint32_t Keyb_ig_status();
@@ -3997,7 +4000,7 @@ static Bitu INT18_PC98_Handler(void) {
0 25lines 20lines
1 80cols 40cols
2 v.lines simp.graphics
3 K-CG access mode(not used in PC-98) */
3 K-CG access mode(not available on original PC-9801) */
//TODO: set 25/20 lines mode and 80/40 columns mode.
//Attribute bit (bit 2)
@@ -4009,8 +4012,7 @@ static Bitu INT18_PC98_Handler(void) {
mem_writeb(0x53C,(mem_readb(0x53C) & 0xF0u) | (reg_al & 0x0Fu));
if (reg_al & 8)
LOG_MSG("INT 18H AH=0Ah warning: K-CG dot access mode not supported");
pc98_cg_kanji_dot_access_mode = !!(reg_al & 8);
pc98_update_text_lineheight_from_bda();
pc98_update_text_layer_lineheight_from_bda();
@@ -4023,7 +4025,7 @@ static Bitu INT18_PC98_Handler(void) {
0 25lines 20lines
1 80cols 40cols
2 v.lines simp.graphics
3 K-CG access mode(not used in PC-98)
3 K-CG access mode(not available on original PC-9801)
7 std CRT hi-res CRT */
/* NTS: I assume that real hardware doesn't offer a way to read back the state of these bits,
* so the BIOS's only option is to read the mode byte back from the data area.