mister-devel/Arcade-TropicalAngel_MiSTer
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adjust vcnt

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I was off by 1 given 2's compliment
This commit is contained in:
birdybro
2022-11-20 22:00:59 -07:00
parent e1101951a8
commit d8baf088df
1 changed files with 2 additions and 2 deletions
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4
rtl/TropicalAngel.vhd
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@@ -295,7 +295,7 @@ cpu_ena <= '1' when clock_cnt = "1011" else '0'; -- (3MHz)
-- vcnt [x0E6..x0FF-x100..x1FF] => 26+256 = 282 lines, 1 frame is 260 x 62.5us = 17.625ms (56.74Hz) -- from MiST, not used in MiSTer
-- hcnt [x076..x0FF-x100..x1FF] => 138+256 = 394 pixels, 394/6.144Mhz => 1 line is 64.06us (15.609KHz) -- updated by @birdybro using measurements from @kold669
-- vcnt [x0DF..x0FF-x100..x1FF] => 19+256 = 275 lines, 1 frame is 275 x 64.06us = 17.616ms (56.76Hz) -- updated by @birdybro using measurements from @kold669
-- vcnt [x0ED..x0FF-x100..x1FF] => 19+256 = 275 lines, 1 frame is 275 x 64.06us = 17.616ms (56.76Hz) -- updated by @birdybro using measurements from @kold669
process (reset, clock_36, pix_ena)
begin
@@ -312,7 +312,7 @@ begin
if vcnt = '1'&x"FF" then
if palmode = '0' then
-- vcnt <= '0'&x"E6"; -- from M52 schematics (MiST)
vcnt <= '0'&x"EC"; -- from measurements by @kold669
vcnt <= '0'&x"ED"; -- from measurements by @kold669
else
vcnt <= '0'&x"C8";
end if;