Apple

Note the bread board area at the left of the top-most blue capacitor.

The 74153 and 74139 chips on the bread board area on the Apple 1 computer, as mentioned on the next page.

Joe writes:

"I built an EPROM card to use in the 44 pin bus in my Apple 1 computer. It had on it two 2716 EPROM's. The 2716 was a 2k memory chip. I had a new monitor and a dis-assembler on the chips. To use this card I had to first unplug the two Apple Proms on the motherboard. As you can see I did not solder the sockets, but wire wrapped the card instead."

The 44 Pin Bus Motherboard connects to the 44 pin edge connector on the Apple I and provides ten slots. Joe cut the board down to three slots due to space limitations in the cabinet.