Added VGA font rom in hex to (hopefully) solve the endianess problems between Yosys/Quartus

roms/vga_font.hex

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rtl/apple1.v

@@ -95,11 +95,9 @@ module apple1(
     //////////////////////////////////////////////////////////////////////////
     // Address Decoding
 
-    wire ram_cs =   (ab[15:13] ==  3'b000);             // 0x0000 -> 0x1FFF
+    wire ram_cs =   (ab[15:13] ==  3'b000);            // 0x0000 -> 0x1FFF
 
     wire uart_cs =  (ab[15:2]  == 14'b11010000000100); // 0xD010 -> 0xD013
-    //wire ps2kb_cs = 1'b0;
-    //wire vga_cs = 1'b0;
 
     //wire ps2kb_cs = (ab[15:1]  == 15'b110100000001000); // 0xD010 -> 0xD011
     //wire uart_cs =  (ab[15:1]  == 15'b110100000001001); // 0xD012 -> 0xD013

rtl/boards/terasic_de0/apple1_de0_top.v

@@ -75,13 +75,12 @@ module apple1_de0_top(
         .vga_red(vga_bit),
         //.vga_grn(vga_bit),
         //.vga_blu(vga_bit),
-        .clr_screen_btn(~BUTTON[1]),
         .pc_monitor(pc_monitor)
     );
 
-    assign VGA_R[3:0] = vga_bit ? 4'b1111 : 4'b0000;
+    assign VGA_R[3:0] = vga_bit ? 4'b1000 : 4'b0000;
     assign VGA_G[3:0] = vga_bit ? 4'b1111 : 4'b0000;
-    assign VGA_B[3:0] = vga_bit ? 4'b1111 : 4'b0000;
+    assign VGA_B[3:0] = vga_bit ? 4'b1000 : 4'b0000;
 
     //////////////////////////////////////////////////////////////////////////    
     // Display 6502 address on 7-segment displays
@@ -114,12 +113,13 @@ module apple1_de0_top(
         .display_out(HEX3_D)
     );
 
-    reg [15:0] cnt;
-    always @(posedge vga_bit)
-    begin
-      cnt <= cnt + 1;
-    end
+    // debugging for VGA stuff:
+    //reg [15:0] cnt;
+    //always @(posedge vga_bit)
+    //begin
+    //  cnt <= cnt + 1;
+    //end
     
-    assign LEDG = cnt[7:0];
+    assign LEDG = 0;
     
 endmodule

rtl/vga/font_rom.v

@@ -34,19 +34,21 @@ module font_rom(
     );
 
     `ifdef SIM
-    parameter ROM_FILENAME = "../roms/vga_font.bin";
+    parameter ROM_FILENAME = "../roms/vga_font.hex";
     `else
-    parameter ROM_FILENAME = "../../roms/vga_font.bin";
+    parameter ROM_FILENAME = "../../roms/vga_font.hex";
     `endif
 
     reg [7:0] rom[0:1023];
 
     initial
-        $readmemb(ROM_FILENAME, rom, 0, 1023);
+        $readmemh(ROM_FILENAME, rom, 0, 1023);
 
     // double width of pixel by ignoring bit 0
     wire [2:0] pixel_ptr;
-    assign pixel_ptr = (3'h7 - pixel[3:1]);
+    
+    //assign pixel_ptr = (3'h7 - pixel[3:1]);
+    assign pixel_ptr = pixel[3:1];
 
     // double height of pixel by ignoring bit 0
     wire [3:0] line_ptr = line[4:1];