Comments for page "The Application Header" http://z80-heaven.wikidot.com/forum/t-3211891/the-application-header Posts in the discussion thread "The Application Header" Fri, 13 Mar 2026 07:48:20 +0000 http://z80-heaven.wikidot.com/forum/t-3211891#post-3567096 Re: The Application Header http://z80-heaven.wikidot.com/forum/t-3211891/the-application-header#post-3567096 Tue, 08 Aug 2017 13:54:41 +0000 Xeda Elnara 595803 I started this, it is not yet complete, but I submitted what I have completed.

Edit: For the most part, complete.

]]> http://z80-heaven.wikidot.com/forum/t-3211891#post-3566135 The Application Header http://z80-heaven.wikidot.com/forum/t-3211891/the-application-header#post-3566135 Mon, 07 Aug 2017 01:33:09 +0000 Xeda Elnara 595803 I'm sorry, I'm strapped for time so I can't help just yet— maybe in a few weeks.

This page is in need of an overhaul and while I want to keep the cheeky language, it's absolutely incorrect about a few key points. Application headers are restricted to 128 bytes, but only as an upper limit. A minimum header is a few dozen bytes. An example here is 32 bytes and could be less depending on the size of the app name.:

.org $4000 .db $80,$0F, 0,0,0,0 .db $80,$12, $01,$04 ;signing key ID .db $80,$47, "AppName" ;change the $47 according to name len (last nibble is the length). .db $80,$81, 1 ;num pages .db $80,$90 ;no splash .db $03,$22,$09,$00 ;date stamp .db $02,$00 ;date stamp signature .db $80,$70 ;final field appstart:
]]>