Microdigital

Historia

TK82C was a Sinclair ZX81 clone made by Microdigital Eletronica Ltda., a computer company located in Brazil. The TK82C (the C letter stands for Científico, or Scientific in English) was replaced by the TK83 (it used a ULA similar chip, as the original ZX81) and by the TK85 (a 16 KB RAM version with a case similar to ZX-Spectrum), more robust and with a better design. Microdigital later produced the TK90X and TK95, which were clones of the ZX Spectrum.

Características

Lenguajes  	Sinclair BASIC (extended in 82C & 83)
Teclado  	Membrane 40 Teclas
CPU  	Z80A
Velocidad  	3.25 MHz
Co-procesador  	ULA custom chip in TK-83
RAM  	2 KB up to 16 KB (82 & 82C) or 64 KB (83)
ROM  	4 KB (82), 8 KB (82C & 83)
Modos de Texto  	32 chars. x 24 lines
Modo gráfico  	64 x 22 dots
Colores  	Monochrome
Sonido  	Beeper
Tamaño/Peso  	Approx. 17.5 (W) x 23 (D) x 3.8 (H) cm / 340 g
Puertos de entrada/salida  	TV/RF, Bus expansion, tape recorder In/Out, Joystick, Alimentacion
Fuente de alimentación  	External 10V Fuente de alimentación unit
Perifericos  	All of the Sinclair and third sources Perifericos

Curiosidades

The TK82C (the C letter stands for Científico, or Scientific in English) was replaced by the TK83 (it used a ULA similar chip, as the original ZX81) and by the TK85 (a 16 KB RAM version with a case similar to ZX-Spectrum), more robust and with a better design. Microdigital later produced the TK90X and TK95, which were clones of the ZX Spectrum.

Historia

It was a close copy of the ZX81 but offered some enhanced features: 2 KB of RAM expandable up to 64 KB, and a joystick interface.

Características

Lenguajes  	Sinclair BASIC
Teclado  	Membrane 40 Teclas
CPU  	Z80A
Velocidad  	3.25 MHz
RAM  	2 KB up to 64 KB
ROM  	8 KB
Modos de Texto  	32 chars. x 22 lines
Modo gráfico  	64 x 44 dots
Coloresc  	Monochrome
Tamaño/Peso  	167 (W) x 175 (D) x 40 (H) mm / 350g
Puertos de entrada/salida  	Tape recorder, joystick, TV-RF
Fuente de alimentación  	External AC adaptor
Perifericos  	16 and 48K RAM modules, all of the Sinclair Perifericos
Precio  	85$ (USA, 1983)

Curiosidades

The tape speed could be either 300 or 4200 baud per second. The machine shipped with a beige or silver case, the same size as the ZX-81s.

Historia

The TK85 was a ZX81 clone made by Microdigital Eletronica, a computer company located in Brazil. It came with 16 or 48 kB RAM, and had a ZX Spectrum-style case, more precisely a Timex Sinclair 1500 clone.

Características

Lenguajes  	Improved version of the ZX81 Basic
Teclado  	40-key QWERTY rubber Teclado with up to 5 function per key
CPU  	Zilog Z80 A
Velocidad  	3.25 MHz
RAM  	16 KB up to 48 KB
ROM  	10 KB
Modos de Texto  	32 columns x 24 lines
Modo gráfico  	64 x 44 dots
Coloresc  	Monochrome
Tamaño/Peso  	23 (W) x 14 (D) x 3 (H) cm / 500g
Puertos de entrada/salida  	Expansion port, Tape-recorder, RF video out, Joystick
Almacenamiento interno  	None
Perifericos  	Microdigital printer, all ZX81 Perifericos

Curiosidades

It had some special features like high speed (1500 bps) load and save

Historia

The TK-2000 was a clone of the Apple IIc for its Electronics part; and a copy of the Atari 1200XL for the casing part.

Características

Lenguajes  	BASIC interpreter
Teclado  	Full stroke 54 key with arrow Teclas
CPU  	6502
Velocidad  	1.2 MHz
RAM  	64 KB or 128 KB (Model II)
VRAM  	1 KB (Text mode) or 8 KB (Graficos mode)
ROM  	16 KB
Modos de Texto  	40 chars. x 24 lines
Modo gráfico  	40x48 x 8 Colores, 280x192 x 6 Colores and 280x192 x 6 Colores with text
Coloresc  	8
Sonido  	TV (by RF out)
Tamaño/Peso  	37.6 (W) x 32 (D) x 6.7 (H) cm
Puertos de entrada/salida  	1 expansion slot, rf and composite video (PAL-M), 2 joystick, tape recorder In/Out, 1 parallel.
Almacenamiento interno  	None
OS  	Apple) DOS 3.3 compatible
Fuente de alimentación  	external Fuente de alimentación unit (110/220V)
Perifericos  	All Apple II expansion cards & Perifericos

Características

1.DECATHLON
2.ENDURO
3.FOOTBAL
4.FROGGER
5.PACMAN
6.RIVER RAID
7.SEAQUEST
8.SMURF
9.TENNIS
10.ZAXXON

Historia

The TK90X was the first Sinclair Spectrum clone produced by Microdigital.

Características

Lenguajes  	Sinclair BASIC
Teclado  	Rubber Teclado - 40 Teclas
CPU  	Z80A
Velocidad  	3.58 MHz
RAM  	16K and 48K versions
ROM  	16 KB
Modos de Texto  	32 chars. x 24 lines
Modo gráfico  	256 x 192 dots
Coloresc  	8 with two tones each (normal and bright)
Sonido  	1 voice / 10 octaves (via TV set)
Puertos de entrada/salida  	Expansion port, tape-recorder (1200 bauds), RF video out, Joystick
Fuente de alimentación  	External 9V DC Fuente de alimentación unit
Perifericos  	Sinclair (not all) and third sources Perifericos
Precio  	16K Cruzeiros 1.499.000, US$ 214 (1985)
48K Cruzeiros 1.749.000, US$ 249

Historia

The goal with the TK95 was to offer a true Spectrum compatible system with a case and keyboard as strong and convenient as a Commodore 64.

Características

Lenguajes  	Sinclair Basic
Teclado  	Full stroke 57 Teclas
CPU  	Zilog Z80 A
Velocidad  	3.58 MHz
RAM  	48 KB
ROM  	16 KB (Basic & OS)
Modos de Texto  	32 chars. x 24 lines
Modo gráfico  	256 x 192 dots
Coloresc  	8 with two tones each (normal and bright)
Sonido  	1 voice / 10 octaves (via TV set)
Puertos de entrada/salida  	Expansion port, tape-recorder (1200 bauds), RF video out, Joystick, Bus expansion
Fuente de alimentación  	External 9V DC Fuente de alimentación unit
Perifericos  	all of the Sinclair and third sources Perifericos

Historia

TK Extended was a local version of PC-XT, launched by Microdigital in 1988.

Características

Lenguajes  	None
Teclado  	Full stroke 86 key (84 key IBM PC-XT + 2 reset Teclas)
CPU  	Intel 8088-2
Velocidad  	4.77 or 8 MHz
Co-procesador  	8087-2 (optional)
RAM  	768 KB
VRAM  	16 KB
ROM  	8 KB
Modos de Texto  	80 chars. x 25 lines
Modo gráfico  	320x200 (4color) or 640x200 (monochrome)
Coloresc  	4
Sonido  	PC Speaker
Puertos de entrada/salida  	1 x Parallel, 2 x Serial RS-232
Almacenamiento interno  	2 x 5.25. floppy drives or 1 x 5.25 + 1 x 3.5 low density
OS  	MS DOS 3.2
Fuente de alimentación  	150w switching Fuente de alimentación unit
Perifericos  	8 PC compatible Slots de expansión

Historia

TK-3000 was the local version of Apple IIe manufactured in Brazil.

Características

Lenguajes  	BASIC interpreter
Teclado  	Full stroke 77 key with numeric keypad and arrow Teclas
CPU  	65C02 + Z80A (solely for Teclado and Portuguese characters management)
Velocidad  	1.023 MHz
RAM  	64 KB (IIe) or 320 KB (Compact)
ROM  	32 KB
Modos de Texto  	40 or 80 chars. x 25 lines
Modo gráfico  	40 x 48, 280 x 192 and 560 x 192 dots
Coloresc  	6 or 16 Colores
Sonido  	Internal speaker
Tamaño/Peso  	39 (W) x 45.7 (D) x 11 (H) cm. (IIe), 37.6 (W) x 32 (D) x 6.7 (H) cm (Compact)
Puertos de entrada/salida  	7 Slots de expansión, composite video (PAL-M), joystick, tape recorder In/Out. Compact has 1 expansion slot
Almacenamiento interno  	None
OS  	(Apple) DOS 3.3, ProDOS or CP/M (with an optional CP/M expansion card)
Fuente de alimentación  	Built-in switching Fuente de alimentación unit (110/220V)
Perifericos  	All Apple and third sources expansion cards & Perifericos
Precio  	about $2000 without monitor and floppy drive unit