Texas Instruments TI-99/4A - Page 109

KEY subprogram
ALPHA
LOCK CTRL
Sf'ACE
Figure 2. Standard TI·9914 Keyboard Scan.
KeY'unit
= 3. Both upper- and lower·case
alphabetical characters returned as upper-case.
Function codes = 1 through 15.
No control characters active,
FCTN
ALPHA
LOCK eTRI
SPACE ferN
Figure 3. Pascal KeyboardScan.
Key-unit == 4. Upper- and lower-case characters active.
Function codes = 129 through 143.
Control character codes 1 through 31.
ALPHA
LOCK 1..:1 HL
SPACE
rCll'd
Pillure 4. BASIC Keyboard Scan.
Key-unrt = tl. Upper- and lower-case char<lcter::; dCli,,!::.
Function codes t through 15.
Control character codes = 128 through 159, 187.
User's Reference Guide
11-89