Radio Shack TRS-80 Model 3 - Page 93

Summary of Important RAM Addresses
Address Initial
Dec
Hex Contents Contents
16396 400C
(BREAK) Jump Vector
C9xxxx
Keyboard scan operations
Three bytes
16409
4019 Caps Lock Switch "Caps"
o= "Upperand Lower Case"
Not0 = "Caps Only"
16412 401C CursorBlink Switch "Blink"
0= "Blink"
Non-Zero = "No-Blink"
16416 4020 CursorAddress N/A
Twobytes: LSB, MSB
16419
4023
CursorCharacter
176
ASCII Code 32- 255
16424 4028 Maximum Lines/Page 67
plus one
16425 4029
Numberof lines printed
1
plusone
16427 402B Line Printer Max. Line "No Max"
length less two.
255 = "No Maximum"
16872 41E8 $RSRCV Input Buffer
0
One byte
16880
41FO $RSTXOutput Buffer
0
One byte
16888 41F8 $RSINIT Baud Rate Code
85
TX Code = Most Sig. Nibble
RCVCode = Least Sig. Nibble
16889 41F9
$RSINIT Parity/Word Length/
108
Stop-Bit Code
16890 41FA $RSINITWAIT Switch "Wait"
0= "Don'tWait"
Non-Zero = "Wait"
16913
4211
Cassette Baud Rate Switch N/A
0= 500 Baud
Non-Zero = 1500 Baud
12/25