Wilson Mines Company
The first module is a 32Mb 4Mx8 5V 10ns SRAM module. Data sheet here. Email me at firstname.lastname@example.org to buy. The picture on the left below shows it larger than actual size on most monitors. The module is 2.3" long.
This is the largest, fastest 5V SRAM module available that I know of, and its pin header makes it easy for hobbyists to build with. The pin
header can be straight or right-angle. When fully populated, it has 64 times as much RAM as the Commodore 64 did, and 32 times as much as the
original Mac did. Being SRAM, it can be battery-backed, and is free of the complications of DRAM management requirements. There's more
discussion of it, and pictures, on the forum here. Daryl Rictor's
SBC-4 computer which he sells (pictured above) uses it. I can provide the
sockets too, both in soldertail and in wire-wrap.
Also available: 1Mx8 EPROM pairs (27C801 in 32-pin windowed DIP) pre-programmed with the large
look-up tables for hyper-fast, accurate 16-bit math on any 8-bit computer. See the articles linked for info. I have some that were
graciously donated and programmed by Tony Gonzalez (Nightmaretony, an esteemed member of the 6502.org forum, who unfortunately succumbed to cancer
in his 40's on 11/4/12), so until those are gone, your cost is only the shipping cost. (If you want to do your own, or load the tables into
RAM, the Intel Hex files are available at the link.)
I have more modules in mind, and I welcome more suggestions. Goals for a home-made computer tend to quickly become too lofty to carry them out in your lifetime-- or change faster than you can build. It helps to have various sections ready-made. The memory module above integrates up to eight fast SMT 512Kx8 5V SRAMs and the bypass capacitors on a small board with parts on both sides and a dual-row socket of 46 pins on .100" centers which is perfect for breadboarding (although if you breadboard, I do recommend using breadboard with at least a ground plane like Twin Industries,' 8100 or 8200 series for this high-performance module).
There's a brief write-up on how I got into home-made workbench computers, microcontrollers, and automated test equipment, with links, in my "Introduce Yourself" post, the first one in the topic. I am very active on that forum, and also have some articles on 6502.org. I have a similar write-up here on how I got into HP calculators as equipment controllers on the workbench, which influenced my own home-made workbench computer designs.
Many more articles, plus show-and-tell of my own projects, are planned for this website.
For 200 links to materials on:
Feature added 5/16/14: simple methods for multitasking without a
Feature added 7/28/12: program structures in 65c02 (and PIC16) assembly, through macros
Feature added 6/25/12: Large look-up tables for hyper-fast, accurate 16-Bit scaled-integer math
Feature added 4/27/12: 6502 PRIMER: Building your own 6502 computer (actually a set of 22 articles covering many aspects, some relating equally well to other computers too)
Feature added 4/5/12: RS-232 primer
page last updated Jun 25, 2014 contact: Garth Wilson, email@example.com (southern California)
domain reserved 2/18/12 © Wilson Mines Co. 2012-2014