Briel Computers

replica 1

by on Apr.03, 2010, under replica 1

The replica 1 is a functional clone of the apple 1 computer created by Steve Wozniak in 1976. This was the computer that Steve Jobs and Woz created to start Apple Computers in 1976. The latest version of the replica 1 is labeled TE for Third Edition. The replica 1 functions exactly like the apple 1 with many of the same components like a 6502 CPU and 6821 PIA. It comes with 32K RAM and 8K EEPROM. Addtional features like a ps/2 port, serial, ATX power connector and DC wall power supply connectors makes the replica 1 a fully functional computer system for todays collector or hobby builder. Available as a kit or assembled, the replica 1 is sure to give you hours of fun and excitement as you relive the glory days of computing. As a new feature, a full blown assembler called Krusader written by Ken Wessen was added to the EPROM space giving the user the ability to assemble 6502 programs right on the replica 1 without a PC. Write 6502 machine code programs using mnemonics instead of just programming hex code into the memory. This added programming tool makes the repica 1 not only a nostalgic computer but a great learning tool and introduction to microprocessors.



replica 1 TE improvements

  • Apple 1 compatible 44 pin slot
  • Apple 1 compatible 44 pin edge connector
  • Bread board area for hobby experiments
  • Elimination of jumpers
  • Improved video display using Parallax Propeller (works with most TV’s and monitors)
  • No need for Apple 1 slot adapter because Apple 1 slot now onboard as well as original replica 1 connector
  • User firmware updates. User can download firmware updates and install. No need to send in for new chips.

Add-on accessories

  • Compact Flash Adapter board
  • Slot 1 Expander (3 apple 1 expansion slot board)
  • Multi I/O board

Other information

  • Applesoft Lite Apple II Applesoft converted for the apple 1 and replica 1
  • Apple 1 ROMS These are the Actual Apple 1 nybble ROM images


This is a block diagram of the replica 1. The idea behind the project was to keep the design down to a minimum of parts and yet still allow full compatibility with the Apple 1 computer.

 This chart shows the memory map of the replica 1. The zero page is identical to the Apple 1, and the main program RAM is increased from 4K to 32K. The area occupied with BASIC was previously RAM on the Apple 1 but now is EEPROM so BASIC is resident in ROM at all times. This makes for faster loading of programs. Krusader also is resident in ROM. These do not change the compatibility of the replica 1 with the apple 1 but makes programming the replica 1 much easier than on the apple 1.


This is a diagram of the pinout of the expansion connector on the replica 1. It is different than the apple 1 in a few ways. First, it uses standard IDC 40 pin connector like on a IDE hard drive. Secondly, there are only 40 pins instead of 44 because some of the pins on the apple 1 were not needed to replicate the computer.





The multi I/O board is an all-in-one solution that gives the user 2 8 bit bi-directional ports with 4 handshaking lines, a true RS232 serial port with speeds up to 19,200 BAUD, and a 8K EEPROM programmer to store data or programs. There is a socket to add your own speakjet voice chip that works in conjunction with the serial port to make your replica 1 or apple 1 speak! The speakjet is not included but can be purchased here.



The CFFA1 is a add on storage card for the replica 1 and apple 1 computers. It uses compact flash cards to allow you to load/store programs onto your replica 1 or apple 1 computer. The menu driven card has the ability to format, create 1 level deep subdirectories, load, save basic and assembly language programs. This is the only storage card you need for the replica 1.

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