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Is SUBLEQ the Right Choice for a VM?

SUBLEQ is an interesting architecture because of its simplicity, adaptability and power. It is therefore an attractive choice for a simple virtual machine. However, this comes at a cost which we will...   Read More

XCCP: A Shell Extension for CP/M

XCCP describes itself as an Extended Console Command Processor for CP/M. It supports the 8080 and v1.0 was released by Anton R. Fleig in 1984. Like EPEX, XCCP doesn't require installing so we can begi...   Read More

EPEX: An Environment Extension for CP/M

Epex is an evironment extension for CP/M. It stands for Environmental Processing EXecutive, and v1.1 was released by James H. Whorton in 1986. It can make using CP/M much more comfortable at the cost...   Read More

File Comparison Utilities on CP/M

There are many utilities available for CP/M to compare the differences between files and to distribute those differences. All the utilities in this article can be found on the Walnut Creek CD. Binary ...   Read More

80 Columns in Software on the Commodore VIC-20

If you have good eyesight, a well-tuned display and patience it is possible to use 80 columns in software on the VIC-20. This is really just an experiment but considering the limitations of the Vic I ...   Read More

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