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IremM62: add Lode Runner 3 topbottom mask

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...for vertical scroll garbage supression
This commit is contained in:
Gyorgy Szombathelyi 2021-04-19 20:47:00 +02:00
parent 272dd86bcd
commit ef227c1d96
3 changed files with 10 additions and 1 deletions
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1
Arcade_MiST/IremM62 Hardware/rtl/Graphics.VHD
View File

@ -83,6 +83,7 @@ begin
-- video data signals (in)
rgb_i => rgb_data,
topbottom_mask => graphics_i.bit16(3)(0),
-- video control signals (out)
video_ctl_o => from_video_ctl,

9
Arcade_MiST/IremM62 Hardware/rtl/iremm62_video_controller.vhd
View File

@ -17,6 +17,7 @@ entity iremm62_video_controller is
-- video input data
rgb_i : in RGB_t;
topbottom_mask: in std_logic;
-- control signals (out)
video_ctl_o : out from_VIDEO_CTL_t;
@ -82,7 +83,10 @@ begin
-- display blank
if hcnt = "00"&x"FF" then
hblank1 <= '0';
if vcnt = '1'&x"00" then
if vcnt = '1'&x"00" and topbottom_mask = '0' then
vblank <= '0';
end if;
if vcnt = '1'&x"08" then
vblank <= '0';
end if;
end if;
@ -95,6 +99,9 @@ begin
end if;
if hcnt = "00"&x"87" then
hblank2 <= '1';
if vcnt = '1'&x"F7" and topbottom_mask = '1' then
vblank <= '1';
end if;
if vcnt = '1'&x"FF" then
vblank <= '1';
end if;

1
Arcade_MiST/IremM62 Hardware/rtl/platform.vhd
View File

@ -552,6 +552,7 @@ begin
graphics_o.bit16(0) <= scrollram_d_o when hwsel = HW_HORIZON else m62_hscroll;
graphics_o.bit16(1) <= m62_vscroll;
graphics_o.bit16(2) <= m62_vscroll2;
graphics_o.bit16(3)(0) <= m62_topbottom_mask;
end block BLK_SCROLL;