Replica 1 plus Users Manual The original 40 pin header that was offered on the previous versions of the replica 1 is now gone. It still remains on the 3 slot expansion board for those who want to do their own hardware experiments. As well as being able to run all the original Apple 1 software and hardware, the replica 1 has the capability to use modern hardware like a ps/2 keyboard and use a standard USB connector power supply. The added USB serial port gives the user the ability to download programs right from your PC or Mac into the replica 1 making software sharing possible. Figure 4:
Logic diagram of replica 1 plus computer Keeping a simple design structure was important with the replica 1. Chip reduction is the way Woz designed the Apple 1 and the replica 1 follows in its path. Only 8 IC chips are now on the replica 1 plus the serial USB adapter making it the most efficient replica 1 ever. The replica 1 ten continues uses the new Parallax Propeller as the I/O controller plus it is now the master 1MHz clock and replaces 1 IC for logic. This new micro- controller has the ability to handle all I/O including video, serial, and PS/2 port. While the replica 1 has been in production for over 10 years, it is always a work in progress.
Sometimes bugs and fixes come up and changes to the board are always discussed on the replica 1 forums. For the latest in design changes and modifications, see the replica 1 forum at: http://www.brielcomputers.com/phpBB2/ The replica 1 plus is currently the most advanced replica Apple 1 produced. It encompasses features as requested by current or future owners of replica 1, as well as design improvements, bug fixes and other enhancements. All revisions remain mostly backward compatible with the original replica 1. © Briel Computers 2014 page 9