Saturday, June 26, 2010

Gold Purple Ceramic chips from 1976

I picked up a few (about 22) NOS gold ceramic DRAM and two 6820 chips recently. Here they are on an Obtronix board where I tested them. Out of the two 6820s, one doesn't work. The DRAM chips appear to work. These chips will eventually live on the Apple-1 Mimeo that I recently built.
The DRAM chips are MOSTEK 4027 P-3, most made in the 14th, and 19th weeks of 1976. The Motorola 6820L was made in the 48th week of 1976. Note the gold grounding straps on some of the DRAM chips.

Wednesday, June 2, 2010

Hand Wired / Wire wrapped Apple-1 = WOW

My friend Aurelien Zavattiero sent me these images earlier this week. He has spent the last 5 months working on a wire wrapped Apple-1 from scratch! Look at this, it's a work of beauty!
Aurel is very close to having the video section working as you can see in the images.