Briel Computers

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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.

 

NOTE: THE REPLICA 1 IS CURRENTLY OUT OF STOCK

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

SYSTEM INFORMATION:

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.

 

CFFA1

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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Micro-KIM

by on Dec.31, 2009, under Micro-KIM

Introducing the micro-KIM. The micro-KIM is a clone of the KIM-1 created by MOS Technology in 1975 as a development board for the 6502 CPU. The micro-KIM uses many of the same components as the KIM-1 to give it that authentic vintage feel. No custom components are used and the micro-KIM is designed with off the shelf parts. As an improvement to the original KIM-1 the RS-232 interface is included onboard to make I/O easier. Some components on the original KIM-1 are no longer available. The 6530 RIOT included a custom programmed ROM and has been replaced by a 6532 RIOT and an external ROM. The custom 23 key keypad is onboard with tactile switches giving the micro-KIM a compact size. A total of 5K RAM is on board with an expansion header for future expansion of memory or add-on boards. With a projected selling price of $99 the micro-KIM is one of the most affordable 8 bit computer kits available today. As a matter of fact, the micro-KIM was designed around the student market in an effort to offer students and schools a low-cost 8 bit CPU trainer.

SYSTEM INFORMATION

  • 6502 CPU running at 1Mhz
  • 2K EPROM replacing built in ROM on 6530′s
  • 5K RAM using the KIM-1 memory map
  • RS-232 interface made to work with TTY interface built in KIM-1
  • Single-Step mode for debugging
  • Debounced RESET and STEP switches
  • 40 pin header for future expansion
  • I/O of the 6 digit display and keyboard are memory mapped exactly like the KIM-1 for full program compatibility.

  • Most pins are standard 8 bit signals but a few are custom signals. DEN is Decode Enable. It is the enable line for the onboard Memory. This is connected to JP1 onboard.
  • IO3 is the decode line for the 2nd 6532 as an option. Preaddressed at $1700-173F
  • TAPE is a required line for finishing the cassette tape interface
  • PB7 is the 7th bit of I/O port B on the onboard 6532

Add-on Accessories:

32K RAM CardThe 32K RAM card is an optional card that increases the total RAM on your micro-KIM from 5K to 37K. The extra 32K is addressed from $2000-9FFF in memory because most of the programs available including floating point BASIC reside in $2000-up. When installed, JP1 jumper needs to be removed so the RAM card can decode memory. Current price is $25 for the kit that you solder yourself and $35 for the assembled and tested board.

 

Micro-KIM user manual: http://www.brielcomputers.com/files/mkmanual.pdf

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