Corey986
Administrator
Figured some of you might be interested in what I've been up to for the past two weeks. I was hired by Bonham's in NYC to get a newly discovered and soon to be auctioned in October Apple-1 running.
The board is in amazing shape. It's an early Byte-Shop board and has no modifications, an un-used and perfect breadboard area and even the screws on the LM323k aren't heat cycled. The board required some troubleshooting as it is 38 years old. The ACI needed a some triage but it's 100% now. I tested/examined every chip on both board and ACI and ESR'd all electrolytic caps before powering on.
At first I used my keyboard and power supply, then I repaired their power supply and made it safe.
The keyboard was a problem. Apple-1 did not come with a keyboard, this keyboard was wired up for the Apple-1 by the original owner. The ICs on the keyboard are pre-7400 series chips. There was a dead gate on an inverted hex buffer. Not having schematics this was fun to track down. I had to desolder the chip, socket it just in case it goes again in the future (Mike W. figures at some point the KB was plugged in backwards). I replaced it with a date correct part. I also repaired the reset button which is an external switch that simply hangs off two wires. The left <CTRL> key is hard wired to clear screen....
Here are some pics....
Cheers,
Corey
The board is in amazing shape. It's an early Byte-Shop board and has no modifications, an un-used and perfect breadboard area and even the screws on the LM323k aren't heat cycled. The board required some troubleshooting as it is 38 years old. The ACI needed a some triage but it's 100% now. I tested/examined every chip on both board and ACI and ESR'd all electrolytic caps before powering on.
At first I used my keyboard and power supply, then I repaired their power supply and made it safe.
The keyboard was a problem. Apple-1 did not come with a keyboard, this keyboard was wired up for the Apple-1 by the original owner. The ICs on the keyboard are pre-7400 series chips. There was a dead gate on an inverted hex buffer. Not having schematics this was fun to track down. I had to desolder the chip, socket it just in case it goes again in the future (Mike W. figures at some point the KB was plugged in backwards). I replaced it with a date correct part. I also repaired the reset button which is an external switch that simply hangs off two wires. The left <CTRL> key is hard wired to clear screen....
Here are some pics....
Cheers,
Corey
