TI-99/4a
an early home computer (which pre-dates the term “pc”) release by texas instruments in june of 1981. the ti99/4a computer sold for $525, without a monitor. specs included:
ram: 256 bytes – memory expansion card can be added : 4 kb or 32 kb (up to 52 kb)
rom: 26 k
vram: 16k
built in software: ti basic
processor: tms9900
clock: 3.3 mhz
video:
ntsc: tms9918a/tms9928a, pal/secam: tms9929a, 256 x 192, 64 x 48, 32 x 24. 16 colors available. standard mode: 24 lines and 32 columns of 8×8 pixel characters, with 2 colors (foreground and backgroud) per group of 8 characters. text mode: 24 lines and 40 columns of 8×6 pixel characters. monochrome display: 2 colors (foreground, background) for all characters. no sprites. multicolor mode: 48 lines and 64 coloumns of 4×4 boxes. each box can have its own color. graphic mode: 192 lines and 32 columns of 1×8 pixels “characters”. each character can have its own set of two colors. in addition, the vdp can handle up to 32 sprites. each can have a color of its own (background is always transparent).
color palette: 16
sound:
tms 9919 complex sound generator. the sound chip can emit simultaneously up to 3 tones and 1 noise (which can be a periodic or a white noise). the theoretical frequency range is from 28 hz to 111 khz and the volume can be adjusted on a scale of 0 to 15.
interfaces:
1 x cartridge, 1 x expansion port, 1 x composite monitor out, 1 x c-ssette interface, 1 x joystick (non atari compatible)
disk drive:
no built-in drive.
power supply:
external
many a programmer learned to write code on a ti-9/4a.
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