Texas Instruments TI-99/4A - Peripheral Hardware Overview

Appendix
KEYBOARD MAPPING
The following di,qgr;:lms illustrate the key codt"-s returned in the four keyboard modes specified by the
key-unit value in the CALL KEY statement. The figures on the upper key face are function codes,
and the lower figures are control codes.
ALPHA
LOCK CTRI
~lPACE
FiRure 1. Standard Tl-99/4 Keyboard Scan.
Key-unit = 3. Both upper- and lower-case alphabetical characters returned as lower-case,
Function codes = 1-15. No control charactErs active.
ALPIU\
1 nr:K URL
SPAC~
r'CTN
User's Reference Guide
Figure 2. Pascal Keyboard Scan.
Key-unit = 4 Upper- and lower-case characters active.
Function codes = 129·143. Control character codes = 1-31.
1lI-3