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changeset 6:80b9b4503bb4

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Adjust Coco 3 default MMU map for stock ROM compatibility It seems sensible to set up the default MMU mapping the same as the stock ROM does. Since the ROM area has to be up at the top of RAM anyway, there's no particular reason not to do that.
author William Astle <lost@l-w.ca>
date Fri, 04 Nov 2022 00:33:38 -0600
parents 80c18925436d
children b898c74f745c
files src/lwbasic.s
diffstat 1 files changed, 2 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/src/lwbasic.s	Fri Nov 04 00:29:38 2022 -0600
+++ b/src/lwbasic.s	Fri Nov 04 00:33:38 2022 -0600
@@ -356,9 +356,9 @@
                 fdb 0                           ; *reserved placeholder*
                 fcb 0,0,0,0                     ; SG4 screen settings with black border
                 fcb 0x0f,0x00,0x00,0x00         ; (puts screen in bottom 64K of memory)
-                fcb 0x00,0x01,0x02,0x03         ; MMU task 0 (non-ROM area at bottom of RAM)
+                fcb 0x38,0x39,0x3a,0x3b         ; MMU task 0 (bottom of top 64K of RAM)
                 fcb 0x3c,0x3d,0x3e,0x3f         ; (ROM shadow must be in 3c...3f)
-                fcb 0x00,0x01,0x02,0x03         ; MMU task 1 (copy of task 0)
+                fcb 0x38,0x39,0x3a,0x3b         ; MMU task 1 (copy of task 0)
                 fcb 0x3c,0x3d,0x3e,0x3f
                 fcb 18,54,9,36,63,27,45,38      ; palette values (RGB)
                 fcb 0,18,0,63,0,18,0,38