Apple-1 Prototypes


#1
The first prototype of the Apple-1 was hand wired by Steve Wozniak. Steve used point to point soldered wiring rather than wire wrap because it was easier to follow the wiring once built up. The prototype is shown in an early video by Steve Wozniak himself (Video section of this page). In an interview Woz talked about the upper board you can see in pictures. There are 4 white 2 KB EPROMs and that's how he developed BASIC and other routines of the Apple-1. Unfortunately, the prototype could be lost. Woz can't remember where it is and maybe it was destroyed in a fire in Woz' garage.

#2
Another prototype could still exist. It is a pre-production mainboard. The mainboard is very different from the production units. The 6800 area is populated. There is no switch board above the 74154. Orange capacitors (Sprague Atom). The logo is different. Chips are arranged the same way like in the production units, but trace lines are very different.

#3 and #4
Here are listed two more Apple-1. Both are shown in Apple-1 ads and handouts. They do not look particular like prototypes but for #3 some chips are different. 2513 is a ceramic version, PIA is a zebra-ceramic and the DRAM is Mostek MK4096P-11 (ceramic) instead of MK4096N-11 (plastic).
And the little capacitors are the same used for NTI boards (2nd Batch) except some. There is no NTI logo. Maybe it was a pre-production NTI board?

If you want to read more about the engineering of the Apple-1 you can find many books about it.

unknown
Hand wired, no number on the back
Might no longer exist
1 picture, 1 video
with history
no auction
Woz - first prototype. Orange capacitors.
unknown
Pre-production, no number on the back
Might no longer exist
1 picture
with history
no auction
Ceramic CPU, ceramic PIA, 4 KB ceramic DRAM
Unique mainboard. Orange capacitors
unknown
1st batch, backside unknown
Might no longer exist
3 pictures
with history
no auction
Ceramic CPU, ceramic PIA, 8 KB ceramic DRAM
unknown
1st batch, backside unknown
Might no longer exist
1 picture
with history
no auction
Ceramic CPU, plastic PIA, 8 KB ceramic DRAM

Notes

= location, = batch, numbers/stamps/labels, = verification status, = picture and video count, = available history, = auctions.
Accuracy: No guarantee can be given for the accuracy of any information. If you have more information please feel free to contact me. Many very good replica of Apple-1 exist. Even with date code correct components. Anyone interested in buying Apple‑1 have to keep this in mind. Hobbyist usually building replica for private use. Even some museums use replicas.
Last update: Sep 16, 2021. Change log for all Apple-1.
Technical info: For much better performance all pictures are significantly reduced in size through admin by using efficient compressing tools for pictures shown on the web.


You can link to the Apple-1 Registry. Any form of reprint or reproduction (including excerpts) only with written permission of the Apple-1 Registry. Here you find press releases and images free to use under CC BY-SA 4.0.
If you have pictures and/or informations about any Apple-1, it would be very kind to share it with us.

Contact the Apple-1 Registry.

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