fix #7ffd port decoding; 3dos ports now available only with +3 rom

This commit improve compatibility with bunch of software like: - Test 4.30 - Eye Ache 2 by Code Busters - 70908 by Scoopex (trd version) - Void by Invaders (RU version)
UzixLS · Apr 24, 2021 · 36aabee · 36aabee
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commit 36aabee
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Showing 3 changed files with 3 additions and 3 deletions.
diff --git a/cpld/rev.CD/top.v b/cpld/rev.CD/top.v
@@ -608,7 +608,7 @@ end
 
 
 /* PORT #7FFD */
-wire port_7ffd_cs = n_ioreq == 0 && xa[1] == 0 && xa[15] == 0 && xa[14] == 1'b1;
+wire port_7ffd_cs = n_ioreq == 0 && xa[1] == 0 && xa[15] == 0 && (xa[14] == 1'b1 || !rom_plus3);
 reg vbank;
 reg rombank128;
 reg lock_7ffd;
@@ -666,7 +666,7 @@ end
 
 
 /* PORT #1FFD */
-wire port_1ffd_cs = !extlock && n_ioreq == 0 && xa == 16'h1FFD;
+wire port_1ffd_cs = rom_plus3 && n_ioreq == 0 && xa == 16'h1FFD;
 reg [2:0] p1ffd;
 always @(posedge clk28 or negedge rst_n0) begin
 	if (!rst_n0) begin
@@ -681,7 +681,7 @@ end
 
 
 /* PORTS #2FFD & #3FFD (+3DOS) */
-wire port_2ffd_3ffd_cs = !extlock && n_ioreq == 0 && (xa == 16'h2FFD || xa == 16'h3FFD);
+wire port_2ffd_3ffd_cs = rom_plus3 && n_ioreq == 0 && (xa == 16'h2FFD || xa == 16'h3FFD);
 always @(posedge clk28 or negedge rst_n0) begin
 	if (!rst_n0) begin
 		plus3_dwr <= 1'b1;

diff --git a/out/cpld.rev.C1.pof b/out/cpld.rev.C1.pof
diff --git a/out/cpld.rev.D1.pof b/out/cpld.rev.D1.pof