The Apply 300 was a Brazilian clone of the Sinclair ZX81 introduced by ''CDSE - Centro de Desenvolvimento de Sistemas Elétricos Ltda.'' It came out in 1983, at a time where several clones of popular computers were introduced on the Brazilian market. It competed with machines like the

AS-1000 The AS-1000 was a Brazilian clone of the Sinclair ZX81 introduced by ''Engebrás Eletrônica e Informática Ltda'' in October 1983. The main differences regarding the ZX81 are the internal power supply and larger RAM. The machine had an initial r ...

, TK83,

TK85 The TK85 was a ZX81 clone made by Microdigital Eletrônica, a computer company located in Brazil. It came with 16 or 48 KB RAM, and had a ZX Spectrum–style case, similar to a ''Timex Sinclair 1500''. Unlike the ZX81, the TK85 used stand ...

Ringo R470 Ringo R-470 was a Brazilian clone of the Sinclair ZX81 by ''Ritas do Brasil Ltda.'' introduced in 1983. It featured a Z80A processor at 3.25 MHz, 8K ROM and 16 KB RAM. It wasn't 100% compatible with the ZX81, and some BASIC tokens have altern ...

or CP-200, being considered today as a rare machine by computer museums.

Features

General features of the Apply 300 match those of the original

ZX81 The ZX81 is a home computer that was produced by Sinclair Research and manufactured in Dundee, Scotland, by Timex Corporation. It was launched in the United Kingdom in March 1981 as the successor to Sinclair's ZX80 and designed to be a low-c ...

machine, with a few enhancements. The power supply was internal and the machine featured a

Z80A The Zilog Z80 is an 8-bit microprocessor designed by Zilog that played an important role in the evolution of early personal computing. Launched in 1976, it was designed to be software-compatible with the Intel 8080, offering a compelling altern ...

processor at 3.25 MHz, 8K ROM and 32 or 48 KB of RAM. The keyboard was chiclet type, but offered 69 keys, including

cursor keys Arrow keys or cursor movement keys are keys on a computer keyboard that are either programmed or designated to move the cursor in a specified direction. The term "cursor movement key" is distinct from "arrow key" in that the former term may r ...

and

numeric keypad A numeric keypad, number pad, numpad, or ten key, is the calculator-style group of ten numeric keys accompanied by other keys, usually on the far right side of computer keyboard. This grouping allows quick number entry with right hand, ...

. It offered an expansion slot at the black, a

RS-232C In telecommunications, RS-232 or Recommended Standard 232 is a standard introduced in 1960 for serial communication transmission of data. It formally defines signals connecting between a ''DTE'' (''data terminal equipment'') such as a computer ...

serial port and a joystick port. There was a connection for a

cassette tape The Compact Cassette, also commonly called a cassette tape, audio cassette, or simply tape or cassette, is an analog audio, analog magnetic tape recording format for Sound recording and reproduction, audio recording and playback. Invented by L ...

recorder, with the machine being able to load and save data into tapes at 300

baud In telecommunications and electronics, baud (; symbol: Bd) is a common unit of measurement of symbol rate, which is one of the components that determine the speed of communication over a data channel. It is the unit for symbol rate or modulat ...

. The Apply 300 could be connected to a standard television over an RF out or

composite video Composite video, also known as CVBS (composite video baseband signal or color, video, blanking and sync), is an analog video format that combines image information—such as brightness (luminance), color (chrominance), and synchronization, int ...

connection, providing a monochrome TV signal. Graphics where the regular ZX81 text mode: 32 X 24 characters, with 64 x 44

semigraphics Text-based semigraphics, pseudographics, or character graphics is a primitive method used in early text mode video hardware to emulate raster graphics without having to implement the logic for such a display mode. There are two different ways ...

. The machine was capable of producing simple beeper like sound effects.

References

{{Sinclair computers and clones Sinclair ZX81 clones Z80-based home computers Computers designed in Brazil Goods manufactured in Brazil Computer-related introductions in 1983