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Fix some stuff with interrupt timing. The change in adjust_int_cycle gets Overdrive working again (vint was not being preferred over hint in some cases). One of the changes seems to have broken Fatal Rewind again, but no other regressions that I can see.
author Michael Pavone <pavone@retrodev.com>
date Sat, 30 Apr 2016 08:37:55 -0700
parents b231162c8fdd
children
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0000: single color blocks
0200: Random symbols????
0400-0C00: Font
0C00-0E??: Score font
0E??: Player name displays

2000-3000: floor (mostly, some garbage around 2800 and 2A00)
3000-6C00: background
6C00-8000: not graphics
8000-~8A00: bat/bird sprites, special attack text
8A00-9000: ?????
9000-9200: More special attack text
9200-9600: another font
9800-AA00: special attack effects?
AC00-B000: ????
B000-B500: character sprite
????
C000-C500: chracter sprite
D000-DA00: window name table
DA00-DC00: Sprite attribute table
DC00-E000: horizontal scroll data
E000-????: plane A&B name table
C500-FFFF: not graphics

VDP Registers:
Mode
00 - 14
01 - 64
Scroll A Name Table Address: E000
02 - 38
Window Name Table Address: D000
03 - 34
Scroll B Name Table Address: E000
04 - 07
Sprite Attribute Table Address: DA00
05 - 6D
06 - 00
Backdrop color - 0
07 - 00
08 - 00
09 - 00
HINT Counter
0A - AF
Mode - Full screen vertical scroll, line horizontal scroll, external ints disabled, 32 cell display, no interlacing
0B - 03
0C - 00
H Scroll Data Address: DC00
0D - 37
0E - 00
Auto increment
0F - 02
Scroll Size
10 - 11
Window H Pos
11 - 00
Window V Pos
12 - 05
DMA transfer length
13 - 00
14 - 00
DMA source address and mode
15 - DB
16 - CF
17 - 7F