[A86] Re: Rom versions & key port

[A86] Re: Rom versions & key port

• To: <assembly-86@lists.ticalc.org>
• Subject: [A86] Re: Rom versions & key port
• From: "David Phillips" <david@acz.org>
• Date: Sun, 26 Jan 2003 11:22:30 -0600
• References: <200202140851.IAA27883@chup-a-chup.scarlet.nl> <3D677CB7.4060101@williams-net.org> <001601c2c53d$a9edb500$4700a8c0@mshome.net>
• Reply-To: assembly-86@lists.ticalc.org

Leif Åstrand writes:
> _vputs ($3ae8 with rom version 1.6)
> _getkey ($3e4e)

Do not depend on them being the same across ROM pages.

> _cphlde ($0107)

If this routine is speed critical to your program, then include it locally:

 push hl
 or a
 sbc hl,de
 pop hl
 ret

There is a faster version, but it destroys the A register:

 ld a,h
 cp d
 ret nz
 ld a,l
 cp e
 ret

> When leaving a program reading keypresses with ports the last pressed
> key is also detected by the shell, can anything be done to avoid
> this?

The easiest solution is to not exit until the key is released.

--
David Phillips <david@acz.org>
http://david.acz.org/

• [A86] Re: Rom versions & key port
• From: Ricky Cobb <arcadesdude@intercom.net>

• [A86] Rom versions & key port
• From: =?iso-8859-1?Q?Leif_=C5strand?= <leif.astrand@multi.fi>

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