Path: utzoo!mnetor!uunet!husc6!bbn!uwmcsd1!ig!agate!ucbvax!pro-sol.cts.COM!mdavis
From: mdavis@pro-sol.cts.COM (Morgan Davis)
Newsgroups: comp.sys.apple
Subject: Re: ProDOS warm re-hook
Message-ID: <8802132016.AA13343@crash.cts.com>
Date: 13 Feb 88 19:46:25 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: pnet01!pro-sol!mdavis@nosc.MIL
Organization: The Internet
Lines: 9

You can install a custom input routine with BASIC.SYSTEM under ProDOS by
putting your assembly code somewhere safe in memory ($300 is okay if it's less
than 200 bytes).  Then all you do is:

        PRINT CHR$(4)"IN# A$300"

Make sure your routine modifies only the accumulator, and the beginning of
your routine should start with a CLD instruction.  See Apple's BASIC
Programming Reference (ProDOS) for more details.