buying the 1802 family -together

[DAVID]

would anyone like to join me in buying from jameco (100 pieces min) 1802 family of micro's?
Specifically, we would need the micro, the video processor, and two of the 256 by 8 static rams.
The purpose would be to wirewrap a modern(?) version of the COSMAC Elf.
If you are interested respond to this post.

[rshayes]

Unless you are planning to make an exact replica, I would buy larger memory chips. I can remember wiring up a 4 kilobyte memory for an 1802 system using 2102 chips (1K x 1). It took 32 chips and a week to do the wiring. If I remember correctly, the 256 x 4 chips were also in an oddball package (22 pins in two rows spaced .4 inch). Sockets for these may be hard to find these days. They weren't all that easy to find even in the early 1980's.<p>The CDP1861 video chip really needs more than a 256 byte memory. With only 256 bytes, the program winds up being displayed on the screen.<p>Maybe the 4K x 8 static RAMs in 24 pin packages are still available.

[josmith]

My first computer. Don't think I WANT 50 more.

[MrAl]

Hello there,<p>Hee hee josmith
My first was a custom design using an
Intel 8080 chip. I thought it was cool at the
time because you could single step one instruction
at a time. Led lights for addresses, etc.,
<chuckle>.<p>These days it should be easy to find something
like 32k static rams around, probably bigger.
That should give you plenty of space.
Dont they even sell low cost ROM programming
equipment that connects to your computer?
That should at least get your boot loader
going.<p>
Take care,
Al

[rshayes]

One of the features of the 1802 (practically unique amoung microprocessors) was that it had a load mode that allowed loading the memory without a monitor program stored in a PROM. I think most Elf designs used this feature.