There are several Apple 1 clones made! The Replica-1 by Vince Briel is the first to apply modern components to replace the hard to get and therefore expensive components, like the Signetics 2513 and such, with modern microprocessors  emulating the terminal part. I found another one, with a dutch background, manufactured and sold by Achatz Electronics, the A-One. The design of this clone is similar: the terminal part is replaced by (this time two) microcontrollers, for video and serial interface.

Some differences between the two designs:

• The A-one is even more compact, less IC’s
• Has a real Apple 1 slot instead of the pinheader on the Replica-1
• No parallel keyboard interface on the A-One
• Selection of NTSC or PAL on the A-One
• The Replica-1 has USB also functioning as power supply as an option 
• The Replica-1 has an AT(X) power connector, required for the -12V of the serial Apple keyboard
• The forum of Briel Computers for the Replica-1 gives good support for the community

Achatz Electronics also sells a prototype board, or a breadboard prototype board.

What really made me buy the A-One also, is the A-One Extended version. The extensions on the standard A-One are a large breadboard and three Apple 1 slots. Together with the breadboard prototype board this make it quite an impressive system to develop hardware for 6502 systems.

The design of the A-One is well documented and open: see the excellent website of WISclub member San Bergmans

All of us older computer geeks know that before selling Macs, Apple founders Steve Wozniak (the genius) and Steve Jobs (the  greedy business man) had a lot of success with the Apple ][ or Apple 2 or whatever marketing tricks were done with the name of that remarkable personal  computer.

The 2 in the name suggest there was a Apple 1 and yes, there were a very limited numbers of boards sold (200 or so, 50 or o survived time, so its a valuable collectible)  branded Apple 1 in the 1976-77 time-frame. It has video on board and accepts input from a full size keyboard, so it is one of the first standalone hobby/personal computers based on a microprocessor, the 6502 of course, being powerful and cheap at that moment). Read more here.

Before he made the Micro-KIM, Vince Briel designed quite a complex replica of the Apple 1. Complex because of the now defunct, hard to get components. He worked around that problem beautifully with innovative modern solutions and added conventient modern connections like USB and PS/2 keyboard. The result is the Apple 1 Replica (SE). And I have one of those nice boards now! Including the slot expansion and the CFFAA1 (Compactflash mass memory) board.

Besides the Replica-1 there is another clone called the A-One. Sold by the dutch company Achatz Elecronics, in kit or assembled form. I really like the A-one Extended, with a breadboard attached and three slots. There also prototype boards, and a breadbaord expanson board. I am condering getting one of these, it looks like the ultimate 6502 experimenters system.

Of course I like the Micro-KIM a bit more, since it is more authentical, with only ‘old’ components!