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changeset 2465:b0408f38f464

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Add missing mask to vscroll calculation in Mode 4
author Michael Pavone <pavone@retrodev.com>
date Sat, 24 Feb 2024 11:53:44 -0800
parents f9d5c137c74b
children b5640ac9aea9
files vdp.c
diffstat 1 files changed, 2 insertions(+), 0 deletions(-) [+]
line wrap: on
line diff
--- a/vdp.c	Fri Feb 23 23:09:20 2024 -0800
+++ b/vdp.c	Sat Feb 24 11:53:44 2024 -0800
@@ -1371,8 +1371,10 @@
 	uint32_t vscroll = line;
 	if (column < 24 || !(context->regs[REG_MODE_1] & BIT_VSCRL_LOCK)) {
 		vscroll += context->regs[REG_Y_SCROLL];
+		vscroll &= 511;
 	}
 	if (vscroll > 223) {
+		//TODO: support V28 and V30 for SMS2/GG VDPs
 		vscroll -= 224;
 	}
 	address += (vscroll >> 3) * 2 * 32;