Difference between revisions of "TI-99/4"
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Stephen Shaw (talk | contribs) (add a couple of differences to 99/4a) |
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[[Image:ti994_console.jpg|300px]] | [[Image:ti994_console.jpg|300px]] | ||
Differences between 99/4 and 99/4A: | |||
Apart from the obviously different keyboard there are other not obvious changes. | |||
==Call Key== | |||
The keyboard change means that for programs to run on BOTH consoles, when using the split keyboard (CALL KEY 1 and 2) you cannot use keys which return the codes 13, 16, and 17. When using a split keyboard on the "A" the key value 0 (zero) does NOT equate to zero - you must use indirect means such as IF A+ 1 = 1. | |||
==Character Set== | |||
Now - non obvious: The 99/ 4A has a different character set - not only are small characters made available (with some clever internal routines) but the big letters are BIGGER by one pixel. The result: A fairly crowded screen AND - if you are fortunate and have a thermal printer - printer TP. U. S. E. (screen dump) does NOT work. (It works, but badly, with no space between letters, vertically). | |||
[[Category:Hardware]] | [[Category:Hardware]] | ||
Revision as of 09:47, 2 October 2014
The TI-99/4 was the predecessor of the TI-99/4A home computer.
Differences between 99/4 and 99/4A:
Apart from the obviously different keyboard there are other not obvious changes.
Call Key
The keyboard change means that for programs to run on BOTH consoles, when using the split keyboard (CALL KEY 1 and 2) you cannot use keys which return the codes 13, 16, and 17. When using a split keyboard on the "A" the key value 0 (zero) does NOT equate to zero - you must use indirect means such as IF A+ 1 = 1.
Character Set
Now - non obvious: The 99/ 4A has a different character set - not only are small characters made available (with some clever internal routines) but the big letters are BIGGER by one pixel. The result: A fairly crowded screen AND - if you are fortunate and have a thermal printer - printer TP. U. S. E. (screen dump) does NOT work. (It works, but badly, with no space between letters, vertically).