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-rw-r--r--src/mame/machine/system24.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/src/mame/machine/system24.c b/src/mame/machine/system24.c
new file mode 100644
index 00000000000..282368df146
--- /dev/null
+++ b/src/mame/machine/system24.c
@@ -0,0 +1,109 @@
+#include "driver.h"
+#include "system16.h"
+#include "includes/system24.h"
+
+/* system24temp_ functions / variables are from shared rewrite files,
+ once the rest of the rewrite is complete they can be removed, I
+ just made a copy & renamed them for now to avoid any conflicts
+*/
+
+UINT16 *system24temp_sys16_shared_ram;
+READ16_HANDLER( system24temp_sys16_shared_ram_r )
+{
+ return system24temp_sys16_shared_ram[offset];
+}
+
+WRITE16_HANDLER( system24temp_sys16_shared_ram_w )
+{
+ COMBINE_DATA(system24temp_sys16_shared_ram + offset);
+}
+
+/* The 315-5296
+ 8 8bits I/O ports, 3 output-only pins, some protection, and
+ external/daughterboard chip selection on half of the address
+ range
+*/
+
+static UINT8 (*system24temp_sys16_io_io_r)(int port);
+static void (*system24temp_sys16_io_io_w)(int port, UINT8 data);
+static void (*system24temp_sys16_io_cnt_w)(UINT8 data);
+static READ16_HANDLER ((*system24temp_sys16_io_iod_r));
+static WRITE16_HANDLER((*system24temp_sys16_io_iod_w));
+static UINT8 system24temp_sys16_io_cnt, system24temp_sys16_io_dir;
+
+void system24temp_sys16_io_set_callbacks(UINT8 (*io_r)(int port),
+ void (*io_w)(int port, UINT8 data),
+ void (*cnt_w)(UINT8 data),
+ READ16_HANDLER ((*iod_r)),
+ WRITE16_HANDLER((*iod_w)))
+{
+ system24temp_sys16_io_io_r = io_r;
+ system24temp_sys16_io_io_w = io_w;
+ system24temp_sys16_io_cnt_w = cnt_w;
+ system24temp_sys16_io_iod_r = iod_r;
+ system24temp_sys16_io_iod_w = iod_w;
+ system24temp_sys16_io_cnt = 0x00;
+ system24temp_sys16_io_dir = 0x00;
+}
+
+READ16_HANDLER ( system24temp_sys16_io_r )
+{
+ // logerror("IO read %02x (%d:%x)\n", offset, cpu_getactivecpu(), activecpu_get_pc());
+ if(offset < 8)
+ return system24temp_sys16_io_io_r ? system24temp_sys16_io_io_r(offset) : 0xff;
+ else if (offset < 0x20) {
+ switch(offset) {
+ case 0x8:
+ return 'S';
+ case 0x9:
+ return 'E';
+ case 0xa:
+ return 'G';
+ case 0xb:
+ return 'A';
+ case 0xe:
+ return system24temp_sys16_io_cnt;
+ case 0xf:
+ return system24temp_sys16_io_dir;
+ default:
+ logerror("IO control read %02x (%d:%x)\n", offset, cpu_getactivecpu(), activecpu_get_pc());
+ return 0xff;
+ }
+ } else
+ return system24temp_sys16_io_iod_r ? system24temp_sys16_io_iod_r(offset & 0x1f, mem_mask) : 0xff;
+}
+
+READ32_HANDLER(system24temp_sys16_io_dword_r)
+{
+ return system24temp_sys16_io_r(2*offset, mem_mask)|(system24temp_sys16_io_r(2*offset+1, mem_mask>>16)<<16);
+}
+
+
+WRITE16_HANDLER( system24temp_sys16_io_w )
+{
+ if(ACCESSING_LSB) {
+ if(offset < 8) {
+ if(!(system24temp_sys16_io_dir & (1 << offset))) {
+ logerror("IO port write on input-only port (%d, [%02x], %02x, %d:%x)\n", offset, system24temp_sys16_io_dir, data & 0xff, cpu_getactivecpu(), activecpu_get_pc());
+ return;
+ }
+ if(system24temp_sys16_io_io_w)
+ system24temp_sys16_io_io_w(offset, data);
+ } else if (offset < 0x20) {
+ switch(offset) {
+ case 0xe:
+ system24temp_sys16_io_cnt = data;
+ if(system24temp_sys16_io_cnt_w)
+ system24temp_sys16_io_cnt_w(data & 7);
+ break;
+ case 0xf:
+ system24temp_sys16_io_dir = data;
+ break;
+ default:
+ logerror("IO control write %02x, %02x (%d:%x)\n", offset, data & 0xff, cpu_getactivecpu(), activecpu_get_pc());
+ }
+ }
+ }
+ if(offset >= 0x20 && system24temp_sys16_io_iod_w)
+ system24temp_sys16_io_iod_w(offset & 0x1f, data, mem_mask);
+}