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sms/vdp: fix bad mirroring

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On the real machine, I ended up at some point getting a weird "bottom
mirroring" issue. It turns out that it was because when I revamped my
VDP flags in an earlier commit, I hadn't read the whole technical
notes about register $02 and falsely thought that B0 was ignored. No
it's not. When set, it mirrors the bottom 8 rows.
This commit is contained in:
Virgil Dupras 2020-11-09 14:56:25 -05:00
parent f7ad84adae
commit be52fb1383
1 changed files with 1 additions and 1 deletions
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2
arch/z80/sms/blk/605
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@ -1,7 +1,7 @@
CREATE _idat CREATE _idat
0b00000100 C, 0x80 C, ( Bit 2: Select mode 4 ) 0b00000100 C, 0x80 C, ( Bit 2: Select mode 4 )
0b00000000 C, 0x81 C, 0b00000000 C, 0x81 C,
0b00001110 C, 0x82 C, ( Name table: 0x3800 ) 0b00001111 C, 0x82 C, ( Name table: 0x3800, *B0 must be 1* )
0b11111111 C, 0x85 C, ( Sprite table: 0x3f00 ) 0b11111111 C, 0x85 C, ( Sprite table: 0x3f00 )
0b11111111 C, 0x86 C, ( sprite use tiles from 0x2000 ) 0b11111111 C, 0x86 C, ( sprite use tiles from 0x2000 )
0b11111111 C, 0x87 C, ( Border uses palette 0xf ) 0b11111111 C, 0x87 C, ( Border uses palette 0xf )