Complex 704 instructions such as floating point trap and input-output routines were emulated in 709 software.
2.
The earliest version of the library contained input / output routines for interacting with computer terminals and an implementation of a simple stack-based interpreter with a Postscript-like syntax that he developed for use in a scientific plotting program.
3.
The basic VELA carries a single 4KB EPROM ( ISL1 or ISL1 * ) which contains the basic input and output routines that handle the keyboard input and 8-digit LED display output together with seventeen user selectable programs which range from a 4-channel digital volt meter to a random event monitor which could be used with a Geiger Counter Probe to measure and log radiation levels from a source material.
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