About
The three type in listings from the second issue of Einstein User, March 1985, on one bootable Xtal BASIC disc.
Galaxy Raiders, by nineteen year old Trevor R. J. Philpott of Shropshire, is a shooting game. Stop the raiders' radiation bombs breaking the force shield, and watch for the mothership after four hits. Z and C move, / fires, SPACE starts.
Tronoise, by thirteen year old Simon Prince of Stafford, is an accelerating and decelerating sound effect in the style of Tron. Press the semicolon to accelerate and the full stop to slow down. As the magazine notes, it never stops on its own.
Simple Graphics Demo, also by Simon Prince, draws four patterns with the POLY command, with SPACE between each.
The listings were printed on pages 28 to 30 of the magazine, which is on this site as Tatung Einstein User Vol1. No.2. This disc saves you typing them in.
Running them
Boot the disc, type XBAS, then LOAD "GALAXY", LOAD "TRON" or LOAD "GFXDEMO", and RUN.
What is in the download
A zip holding the disc image as a DSK, the same disc as an MFI for MAME to write to, the three listings as BASIC text and as tokenised Xtal BASIC, and a README.
Verified
Transcribed from the scan and run on the Einstein in MAME 0.289 with Xtal BASIC 4.2 and MOS 1.2. All four stages of the graphics demo drew and advanced on SPACE; the Tronoise sweep was watched falling on the sound chip's tone registers; Galaxy Raiders was taken through both instruction pages, the controls page, movement, firing and game over. Not run on real hardware.
Kept as printed
Two things look like slips but are what the magazine says. Tronoise line 190 has PSG 0,1 where the three matching lines have PSG 0,I, and it runs either way. Galaxy Raiders never assigns X3, so the mothership starts from the left edge.
The issue's other programming articles, Faster Basic Programs and the BBC BASIC comparison, hold fragments rather than complete programs, so they are not on the disc.
The programs are their authors', published in Einstein User in 1985.
Screenshots
