diff options
Diffstat (limited to 'src/mame/machine/system24.c')
-rw-r--r-- | src/mame/machine/system24.c | 109 |
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); +} |