days end

1 files changed, 32 insertions, 0 deletions

diff --git a/src/video/signetics.c b/src/video/signetics.c
new file mode 100644
index 0000000..944ac4d
--- /dev/null
+++ b/src/video/signetics.c
@@ -0,0 +1,32 @@
+//	signetics.h
+//	The Apple I came with its own terminal on-board, with a Signetics 2513 character ROM, and multiple shift registers acting as video memory.
+#include"cpu/core.h"
+#include"stdlib.h"
+
+const byte CharacterROM[0x40] = {
+	'@' , 'A' , 'B' , 'C' , 'D' , 'E' , 'F' , 'G' , 'H' , 'I' , 'J' , 'K' , 'L' , 'M' , 'N' , 'O' ,
+	'P' , 'Q' , 'R' , 'S' , 'T' , 'U' , 'V' , 'W' , 'X' , 'Y' , 'Z' , '[' , '\\', ']' , '^' , '_' ,
+	' ' , '!' , '"' , '#' , '$' , '%' , '&' , '\'', '(' , ')' , '*' , '+' , ',' , '-' , '.' , '/' ,
+	'0' , '1' , '2' , '3' , '4' , '5' , '6' , '7' , '8' , '9' , ':' , ';' , '<' , '=' , '>' , '?'
+};
+
+byte* TerminalShiftRegister;
+
+int TerminalShiftRegisterOffset;
+
+byte ToAppleASCII(char x)
+{
+	if (x < 0x20 || x >= 0x60)
+		return -1;
+	if (x >= 0x40)
+		x -= 0x40;
+	return x;
+}
+
+byte ToRegularASCII(char x)
+{
+	if (x < 0x20)
+		x += 0x40;
+	return x;
+}
+