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Begin adding support for memory soft switches
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2c39120098
commit
603ad7a036
@ -82,3 +82,12 @@ apple2_dbuf_map(vm_segment *segment)
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vm_segment_write_map(segment, addr, apple2_dbuf_write);
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}
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}
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/*
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* Handle all read switches for display buffer code. Some switches
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* respond to either reads _or_ writes, so you may see some cases
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* duplicated in the write map.
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*/
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SEGMENT_READER(apple2_dbuf_switch_read)
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{
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}
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141
src/apple2.mem.c
141
src/apple2.mem.c
@ -9,6 +9,28 @@
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#include "apple2.mem.h"
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#include "objstore.h"
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static size_t switch_reads[] = {
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0xC013,
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0xC014,
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0xC018,
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0xC01C,
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0xC01D,
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};
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static size_t switch_writes[] = {
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0xC000,
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0xC001,
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0xC002,
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0xC003,
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0xC004,
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0xC005,
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0xC054,
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0xC055,
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0xC056,
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0xC057,
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0xC059,
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};
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/*
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* Set the memory map functions for main memory in an apple2 machine
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*/
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@ -16,6 +38,7 @@ void
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apple2_mem_map(apple2 *mach, vm_segment *segment)
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{
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size_t addr;
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int i, rlen, wlen;
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vm_segment_set_map_machine(mach);
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@ -36,6 +59,17 @@ apple2_mem_map(apple2 *mach, vm_segment *segment)
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vm_segment_read_map(segment, addr, apple2_mem_zp_read);
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vm_segment_write_map(segment, addr, apple2_mem_zp_write);
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}
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rlen = sizeof(switch_reads) / sizeof(size_t);
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wlen = sizeof(switch_writes) / sizeof(size_t);
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for (i = 0; i < rlen; i++) {
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vm_segment_read_map(segment, switch_reads[i], apple2_mem_switch_read);
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}
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for (i = 0; i < wlen; i++) {
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vm_segment_write_map(segment, switch_writes[i], apple2_mem_switch_write);
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}
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}
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/*
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@ -109,3 +143,110 @@ SEGMENT_WRITER(apple2_mem_zp_write)
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segment->memory[addr] = value;
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}
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/*
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* Handle all soft switches that ask for the status of certain memory
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* conditions.
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*/
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SEGMENT_READER(apple2_mem_switch_read)
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{
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apple2 *mach = (apple2 *)_mach;
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switch (addr) {
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case 0xC013:
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return mach->memory_mode & MEMORY_READ_AUX
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? 0x80
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: 0x00;
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case 0xC014:
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return mach->memory_mode & MEMORY_WRITE_AUX
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? 0x80
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: 0x00;
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case 0xC018:
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return mach->memory_mode & MEMORY_80STORE
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? 0x80
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: 0x00;
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case 0xC01C:
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return mach->memory_mode & MEMORY_PAGE2
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? 0x80
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: 0x00;
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case 0xC01D:
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return mach->memory_mode & MEMORY_HIRES
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? 0x80
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: 0x00;
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}
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// ???
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return 0;
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}
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/*
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* Change memory settings based on the soft switches defined in the tech
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* reference
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*/
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SEGMENT_WRITER(apple2_mem_switch_write)
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{
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apple2 *mach = (apple2 *)_mach;
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switch (addr) {
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case 0xC003:
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apple2_set_memory_mode(mach,
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mach->memory_mode | MEMORY_READ_AUX);
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break;
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case 0xC002:
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apple2_set_memory_mode(mach,
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mach->memory_mode & ~MEMORY_READ_AUX);
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break;
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case 0xC005:
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apple2_set_memory_mode(mach,
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mach->memory_mode & MEMORY_WRITE_AUX);
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break;
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case 0xC004:
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apple2_set_memory_mode(mach,
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mach->memory_mode & ~MEMORY_WRITE_AUX);
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break;
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case 0xC001:
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apple2_set_memory_mode(mach,
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mach->memory_mode & MEMORY_80STORE);
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break;
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case 0xC000:
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apple2_set_memory_mode(mach,
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mach->memory_mode & ~MEMORY_80STORE);
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break;
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case 0xC055:
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apple2_set_memory_mode(mach,
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mach->memory_mode & MEMORY_PAGE2);
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break;
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case 0xC054:
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apple2_set_memory_mode(mach,
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mach->memory_mode & ~MEMORY_PAGE2);
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break;
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// NOTE: in one place, the technical reference says $C057 is the
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// soft switch to enable HIRES. In one other place, it says
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// $C059. I'm assuming it's either one... It's otherwise
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// consistent when mentioning soft switches in more than one
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// table.
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case 0xC059:
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case 0xC057:
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apple2_set_memory_mode(mach,
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mach->memory_mode & MEMORY_HIRES);
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break;
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case 0xC056:
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apple2_set_memory_mode(mach,
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mach->memory_mode & ~MEMORY_HIRES);
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break;
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}
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}
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