[VM][FMTOWNS][DMAC] Bit 5 of dma[selch].mode; ADIR don't effects at TOWNS.

- Thanks to YAMAKAWA(CaptainYS)-San.
- This is related to TSUGARU, commit e5920fdc1ba89ba10172f0954ecf1107bb592919.
 > Author:     CaptainYS <PEB01130@nifty.com>
 > AuthorDate: Sat Feb 29 23:43:52 2020 -0500
 > Commit:     CaptainYS <PEB01130@nifty.com>
 > CommitDate: Sat Feb 29 23:43:52 2020 -0500
 >
 >			Better DMA and CDROM emulation.  Still MSCDEX takes extremely
 >			long time to read CD-ROM.
 >
 > Parent:     9390f5be
 >			Found Device-DMACh correspondence in [2] pp. 56.
 >			Still trying to find the correct sequence of CD-ROM
 >			drive data transfer.  Unit test still temporarily broken.

diff --git a/source/src/vm/fmtowns/dmac.cpp b/source/src/vm/fmtowns/dmac.cpp
index 4498d20..b31faab 100644 (file)
--- a/source/src/vm/fmtowns/dmac.cpp
+++ b/source/src/vm/fmtowns/dmac.cpp
@@ -244,8 +244,25 @@ uint32_t TOWNS_DMAC::read_io8(uint32_t addr)
 void TOWNS_DMAC::inc_dec_ptr_a_byte(const int c, const bool inc)
 {
        // Note: FM-Towns may extend to 32bit.
+       // Note: By Tsugaru, commit e5920fdc1ba89ba10172f0954ecf1107bb592919,
+       // ADIR bit (bit 5 of mode register)
+       // has not supported by TOWNS DMAC.
+       // Very tanks to YAMAKAWA-San. - 20230617 K.O
+       //
+       // Commiting message is below:
+       //      Author:     CaptainYS <PEB01130@nifty.com>
+       //      AuthorDate: Sat Feb 29 23:43:52 2020 -0500
+       //      Commit:     CaptainYS <PEB01130@nifty.com>
+       //      CommitDate: Sat Feb 29 23:43:52 2020 -0500
+       //
+       //      Parent:     9390f5be
+       //                                      Found Device-DMACh correspondence in [2] pp. 56.
+       //                                      Still trying to find the correct sequence of CD-ROM drive
+       //                                      data transfer.
+       //                                      Unit test still temporarily broken.
 #if 1
-       uint32_t incdec = (inc) ? 1 : UINT32_MAX;
+//     uint32_t incdec = (inc) ? 1 : UINT32_MAX;
+       const uint32_t incdec = 1;
        uint32_t addr = dma[c].areg &   0x00ffffff;
        uint32_t high_a = dma[c].areg & 0xff000000;
        __LIKELY_IF(dma_wrap) {
@@ -257,11 +274,11 @@ void TOWNS_DMAC::inc_dec_ptr_a_byte(const int c, const bool inc)
        dma[c].areg = addr;
 #else
        uint32_t addr = dma[c].areg;
-       if(inc) {
+//     if(inc) {
                addr = addr + 1;
-       } else {
-               addr = addr - 1;
-       }
+//     } else {
+//             addr = addr - 1;
+//     }
        __LIKELY_IF(dma_wrap) {
                uint32_t high_a = dma[c].areg & 0xff000000;
                addr = addr & 0x00ffffff;
@@ -276,7 +293,8 @@ void TOWNS_DMAC::inc_dec_ptr_two_bytes(const int c, const bool inc)
 {
        // Note: FM-Towns may extend to 32bit.
 #if 1
-       uint32_t incdec = (inc) ? 2 : (UINT32_MAX - 1);
+       //uint32_t incdec = (inc) ? 2 : (UINT32_MAX - 1);
+       const uint32_t incdec = 2;
        uint32_t addr = dma[c].areg &   0x00ffffff;
        uint32_t high_a = dma[c].areg & 0xff000000;
        __LIKELY_IF(dma_wrap) {
@@ -288,11 +306,11 @@ void TOWNS_DMAC::inc_dec_ptr_two_bytes(const int c, const bool inc)
        dma[c].areg = addr;
 #else
        uint32_t addr = dma[c].areg;
-       if(inc) {
+//     if(inc) {
                addr = addr + 2;
-       } else {
-               addr = addr - 2;
-       }
+//     } else {
+//             addr = addr - 2;
+//     }
        __LIKELY_IF(dma_wrap) {
                uint32_t high_a = dma[c].areg & 0xff000000;
                addr = addr & 0x00ffffff;
@@ -441,7 +459,8 @@ bool TOWNS_DMAC::do_dma_per_channel(int ch, bool is_use_debugger, bool force_exi
                                        // update temporary register
                                        tmp = val;
                                }
-                               inc_dec_ptr_two_bytes(c, !(dma[c].mode & 0x20));
+//                             inc_dec_ptr_two_bytes(c, !(dma[c].mode & 0x20));
+                               inc_dec_ptr_two_bytes(c, true);
                        } else {
                                // 8bit transfer mode
                                if((dma[c].mode & 0x0c) == 0x00) {
@@ -482,7 +501,8 @@ bool TOWNS_DMAC::do_dma_per_channel(int ch, bool is_use_debugger, bool force_exi
                                        // update temporary register
                                        tmp = (tmp >> 8) | (val << 8);
                                }
-                               inc_dec_ptr_a_byte(c, !(dma[c].mode & 0x20));
+                               //inc_dec_ptr_a_byte(c, !(dma[c].mode & 0x20));
+                               inc_dec_ptr_a_byte(c, true);
                        }
                        if(d_cpu != NULL) d_cpu->set_extra_clock(wait);