Texas Instruments TI-99/4A
Země / Country:
USA / United States
Rok / Year:
1981
Česky / Czech:
Texas Instruments TI-99/4A, USA, 1981. Domácí počítač používá 16bitový TMS9900 na 3 MHz, ale jeho paměť je neobvyklá. CPU má přímo jen 256 bajtů rychlé scratchpad RAM, zatímco 16 KB RAM patří obrazovému TMS9918A a procesor k ní přistupuje nepřímo. Grafika nabízí 256 × 192, 16 barev a 32 spritů. Tato sestava je rozšířena o 32 KB RAM, syntezátor řeči a FinalGROM99 pro cartridge obrazy z paměťové karty. Původní systém podporuje také kazetu a Peripheral Expansion Box.
English / Anglicky:
Texas Instruments TI-99/4A, USA, 1981. This home computer uses a 16 bit TMS9900 at 3 MHz, but its memory design is unusual. The CPU directly owns only 256 bytes of fast scratchpad RAM, while 16 KB belongs to the TMS9918A video processor and is accessed indirectly. Graphics provide 256 × 192, 16 colours and 32 sprites. This setup adds 32 KB RAM, TI's speech synthesiser and FinalGROM99 for cartridge images on a memory card. The original system also supports cassette storage and the Peripheral Expansion Box.
Technické údaje / Specifications
Výrobce / Manufacturer: Texas Instruments, United States
Model: Texas Instruments TI-99/4A
Rok / Year: 1981
Země / Country: USA / United States
Typ / Type: 16 bit home computer with 8 bit peripheral bus
CPU: TMS9900
Takt CPU / CPU clock: 3 MHz
RAM: 256 bytes fast scratchpad RAM, 16 KB video RAM, optional 32 KB expansion
ROM: 26 KB system ROM and BASIC in model class
Operační systém / Operating system: TI BASIC (ROM), Extended BASIC available on cartridge
Video / Graphics: TMS9918A graphics, 256 × 192, 16 colours and sprites
Zvuk / Sound: TMS9919 or SN76489 family programmable PSG, three tones and noise
Média / Storage: ROM cartridges, cassette, optional Peripheral Expansion Box floppy
Rozhraní / Interfaces: Two joystick ports, cassette, RF/composite via regional units, system expansion
Napájení / Power: External dedicated multi voltage supply
Rozměry / Dimensions: Approximately 379 × 258 × 71 mm
Původní cena / Original price: US $525 reported 1981 launch price, market packages vary
Zdroje / Sources
Texas Instruments TI-99/4A platform and hardware history
Science Museum Group collection measurements TI-99/4A computer 70 × 377 × 256 mm
