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diff zruntime.S @ 507:cc6030bd04c6

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Add 3 wait states to Z80 access to bank area since that seems to be roughly the average in normal usage
author Michael Pavone <pavone@retrodev.com>
date Tue, 28 Jan 2014 08:36:06 -0800
parents b7c3b2d22858
children b976c6d6e5fb
line wrap: on
line diff
--- a/zruntime.S	Mon Jan 27 22:12:22 2014 -0800
+++ b/zruntime.S	Tue Jan 28 08:36:06 2014 -0800
@@ -107,6 +107,8 @@
 	mov (%r11, %r13), %r13b
 	ret
 z80_read_bank:
+	/* approximation of wait states for 68K bus access */
+	add $3, %ebp
 	and $0x7FFF, %r13
 	cmp $0, %r12
 	je slow_bank_read
@@ -158,6 +160,8 @@
 	ret
 z80_write_bank:
 slow_bank_write:
+	/* approximation of wait states for 68K bus access */
+	add $3, %ebp
 	/* TODO: Call into C to implement this */
 	ret
 z80_write_ym2612: