[VM][FMTOWNS][PLANEVRAM] Make registers accessing related to Tsugaru.

diff --git a/source/src/vm/fmtowns/planevram.cpp b/source/src/vm/fmtowns/planevram.cpp
index 9c3e8dd..4a9ea9e 100644 (file)
--- a/source/src/vm/fmtowns/planevram.cpp
+++ b/source/src/vm/fmtowns/planevram.cpp
@@ -18,7 +18,7 @@ void PLANEVRAM::reset()
 {
        mix_reg = 0xff;
        r50_readplane = 0x0; // OK?
-       r50_ramsel = 0x0; // OK?
+       r50_ramsel = 0xf; // OK?
        r50_gvramsel = 0x00000000; // OK?
 }
 
@@ -26,7 +26,7 @@ void PLANEVRAM::write_io8(uint32_t addr, uint32_t data)
 {
        switch(addr) {
        case 0xff80:
-               mix_reg = data & 0x28;
+               mix_reg = data | (~(0x28)); // 20231008 K.O related from manual.
                break;
        case 0xff81:
 //             out_debug_log(_T("0xCFF81=%02X"), data & 0xff);
@@ -65,15 +65,16 @@ uint32_t PLANEVRAM::read_io8(uint32_t addr)
                return ((r50_readplane << 6) | r50_ramsel);
                break;
        case 0xff82:
-               __LIKELY_IF(d_crtc != NULL) {
-                       return d_crtc->read_signal(SIG_TOWNS_CRTC_MMIO_CFF82H);
-               }
+               //__LIKELY_IF(d_crtc != NULL) {
+               //      return d_crtc->read_signal(SIG_TOWNS_CRTC_MMIO_CFF82H);
+               //}
                break;
        case 0xff83:
-               return ((r50_gvramsel != 0x00000) ? 0x10 : 0x00);
+               return ((r50_gvramsel != 0x00000) ? 0x10 : 0x00) | 0xe7;
                break;
        case 0xff84:
-               return 0x7f; // Reserve.FIRQ
+               return 0x00; // Reserve.FIRQ
+               //return 0x7f; // Reserve.FIRQ
                break;
        case 0xff86:
                __LIKELY_IF(d_crtc != NULL) {