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comparison blastem.c @ 616:649db9397fa1

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Add support for Z80 access to VDP via bank area
author Michael Pavone <pavone@retrodev.com>
date Mon, 29 Dec 2014 00:41:36 -0800
parents cf73b72c6d1e
children f822d9216968
comparison
equal deleted inserted replaced
615:edd2c446694b 616:649db9397fa1
730 730
731 uint8_t z80_read_bank(uint32_t location, void * vcontext) 731 uint8_t z80_read_bank(uint32_t location, void * vcontext)
732 { 732 {
733 z80_context * context = vcontext; 733 z80_context * context = vcontext;
734 uint32_t address = context->bank_reg << 15 | location; 734 uint32_t address = context->bank_reg << 15 | location;
735 fprintf(stderr, "Unhandled read by Z80 from address %X through banked memory area\n", address); 735 if (address >= 0xC00000 && address < 0xE00000) {
736 return z80_vdp_port_read(location & 0xFF, context);
737 } else {
738 fprintf(stderr, "Unhandled read by Z80 from address %X through banked memory area\n", address);
739 }
736 return 0; 740 return 0;
737 } 741 }
738 742
739 void *z80_write_bank(uint32_t location, void * vcontext, uint8_t value) 743 void *z80_write_bank(uint32_t location, void * vcontext, uint8_t value)
740 { 744 {
741 z80_context * context = vcontext; 745 z80_context * context = vcontext;
742 uint32_t address = context->bank_reg << 15 | location; 746 uint32_t address = context->bank_reg << 15 | location;
743 if (address >= 0xE00000) { 747 if (address >= 0xE00000) {
744 address &= 0xFFFF; 748 address &= 0xFFFF;
745 ((uint8_t *)ram)[address ^ 1] = value; 749 ((uint8_t *)ram)[address ^ 1] = value;
750 } else if (address >= 0xC00000) {
751 z80_vdp_port_write(location & 0xFF, context, value);
746 } else { 752 } else {
747 fprintf(stderr, "Unhandled write by Z80 to address %X through banked memory area\n", address); 753 fprintf(stderr, "Unhandled write by Z80 to address %X through banked memory area\n", address);
748 } 754 }
749 return context; 755 return context;
750 } 756 }