This area gets very hot so users commonly refer to it as the " coffee cup warmer". The power regulator board is housed below and in front of the cartridge slot under the sloped area to the right of the keyboard. The TI-99/4A's CPU, motherboard, and ROM cartridge ("Solid State Software") slot are built into the keyboard. Both use 16-bit processors, making the TI-99/4 series the first 16-bit home computers. The TI-99/4A added an additional graphics mode, "lowercase" characters consisting of small capitals, and a full-travel keyboard. The TI-99/4 has a calculator-style chiclet keyboard and a character set that lacked lowercase text.
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