changeset 753:cee1275f5d08

Lame placeholder support for floating bus bits of IO hardware. Needs to be replaced with prefetch based values
author Michael Pavone <pavone@retrodev.com>
date Thu, 25 Jun 2015 09:02:42 -0700
parents 296ddfcf0d43
children cfa402c6ced8
files blastem.c
diffstat 1 files changed, 4 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/blastem.c	Mon Jun 22 22:00:44 2015 -0700
+++ b/blastem.c	Thu Jun 25 09:02:42 2015 -0700
@@ -643,6 +643,8 @@
 		} else {
 			if (location == 0x1100) {
 				value = z80_enabled ? !z80_get_busack(gen->z80, context->current_cycle) : !gen->z80->busack;
+				//TODO: actual pre-fetch emulation
+				value |= 0x4E;
 				dprintf("Byte read of BUSREQ returned %d @ %d (reset: %d)\n", value, context->current_cycle, gen->z80->reset);
 			} else if (location == 0x1200) {
 				value = !gen->z80->reset;
@@ -662,6 +664,8 @@
 		value = value | (value << 8);
 	} else {
 		value <<= 8;
+		//TODO: actual pre-fetch emulation
+		value |= 0x73;
 	}
 	return value;
 }