See all articles from Syntax/Syntax ZX80 v3 n4
Review of ZXAS (Z80 assembler) and ZXDB (disassembler-debugger) from Bug-Byte, distributed by Gladstone Electronics. ZXAS supports 256 labels, standard Z80 mnemonics via REM statements; ZXDB offers 10 single-key commands including breakpoint and single-step execution with register display.