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Fixed Text Page switching

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This commit is contained in:
tudnai 2020-05-02 10:36:21 -07:00
parent 54a02f3ea1
commit 040ee3af43
1 changed files with 14 additions and 10 deletions
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20
src/dev/mem/mmio.h
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@ -324,28 +324,32 @@ void resetMemory() {
static uint8_t page2 = 0; static uint8_t page2 = 0;
static uint8_t * activePage = Apple2_64K_RAM + 0x400;
void textPageSelect() { void textPageSelect() {
uint8_t * shadow = Apple2_64K_MEM + 0x400; uint8_t * shadow = Apple2_64K_MEM + 0x400;
if ( page2 != MEMcfg.txt_page_2 ) { if ( page2 != MEMcfg.txt_page_2 ) {
page2 = MEMcfg.txt_page_2; page2 = MEMcfg.txt_page_2;
static uint8_t * newPage = NULL;
if ( MEMcfg.is_80STORE && MEMcfg.txt_page_2 ) { if ( MEMcfg.is_80STORE && MEMcfg.txt_page_2 ) {
// save the content of Shadow Memory newPage = Apple2_64K_AUX + 0x400;
memcpy(Apple2_64K_RAM + 0x400, shadow, 0x400);
// load the content of Video Page 2
memcpy(shadow, Apple2_64K_AUX, 0x400);
} }
else { else {
newPage = Apple2_64K_RAM + 0x400;
}
if ( activePage != newPage ) {
if ( activePage ) {
// save the content of Shadow Memory // save the content of Shadow Memory
memcpy(Apple2_64K_AUX + 0x400, shadow, 0x400); memcpy(activePage, shadow, 0x400);
}
// load the content of Video Page 2 // load the content of Video Page 2
memcpy(shadow, Apple2_64K_RAM, 0x400); memcpy(shadow, newPage, 0x400);
activePage = newPage;
} }
} }