Volume 7, No.4 April 1991

• Shape, Ravel and Roll, Walter Spunde, p.19
• Execution Time, Alan Sykes, p.25
• The Genesis of ASL (2), Tony O’Hagan, p.36
• The Regression Shelf, Alan Sykes, p.41
• ZARK: an APL Tutor, Emily Timson, p.62
• Review: APL.68000 Level II, Iain Hayward, p.67
• GSS Graphics with APL*PLUS/PC, George MacLeod, p.76
• The Ideal Screen Editor, Anthony Camacho, p.78
• APL Graphics from First Principles, Graham Parkhouse, p.83
• Writing Assembly Language Functions for quad-NA, Allan Gay, p.100
• Mandelbrot Sets (2), Ray Cannon, p.110
• NED: a Nesting Editor for APL*PLUS/PC, Olle Evero, p.116
• Thoughts on J ← f g h, Maurice Jordan, p.119
• Full-screen Methods with APL2, Peter Branson, p.126
• A Note on the Match Function in APL, Joseph De Kerf, p.133
• The Steam Hammer and the Fly, Gérard Langlet, p.138