This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
Resources & Credits IIgs Diagnostic Jeff Tarr, Jr. Apple IIgs Technical Reference by M. Fischer (pg. 213-217) IIgs TechNotes #95: ROM Diagnostic Errors by Dan Strnad Sep, 1990 GS/OS Apple IIGS GS/OS Reference (pg. 438-439). For info on Expressload and System Loader refer to pg. 200-234. ProDOS 16 and System Loader Apple IIgs ProDOS 16 Reference (pg. 302-311) ProDOS 8 ProDOS Technical Reference Manual (pg. 77-79) Beneath Apple ProDOS by Worth & Lechner (pg. 6.59-6.61) RamFAST Paul Creager (wily@svpal.svpal.org) SmartPort Apple IIGS Firmware Reference (pg. 156). Tool Sets Volumes 1-3 of the Apple IIGS Toolbox Reference set. A good on-screen listing of errors encountered on the IIgs (plus lots of other toolbox, softswitch, etc. info) is available via Dave Lyons's NiftyList CDA package ($15, Shareware). Another good on-screen list is Jeff Tarr Jr.'s ErrorCodes CDA v1.7 ($5, Shareware). Applesoft, DOS 3.3, ProDOS BASIC.SYSTEM, and ErrorWindow error codes are not listed because errors are reported directly in text messages. For codes and descriptions see ... Applesoft Basic Programming Reference Manual (pg. 81) DOS 3.3 The DOS Manual (pg. 114-115) Beneath Apple DOS by Worth & Lechner (pg. 8.20) BASIC.SYSTEM Exploring Apple GS/OS and ProDOS 8 by Little (pg. 249) ErrorWindow 'Toolbox Reference: Volume 3 (pg. 52.53-52.56)
 
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