This is the Table of Contents for the z80 instructional references. These will be extremely useful in getting to know the z80 processor.
z80 Hardware Reference - References to the z80 registers and memory areas
z80 Instruction Set Summary(1) - A simple summary of the a80 Instruction Set
z80 Instruction Set Summary(2) - Another well written Instruction Summary set
z80 Optimizations - Ways to optimize your programs
Z80 Insructions (Complete) - Complete Set of Z80 Instructions
These are Internet sites that contain great information about z80 assembly programming and news about TI calculators
www.ticalc.org
www.calc.org
www.oocities.org/SiliconValley/Peaks/3938/
www.oocities.org/SiliconValley/Mouse/2260/
www.TI.com/Calc/
www.zilog.com