Article View: comp.sys.amiga.tech
Article #9274Re: Problem with double-buffering and some 1-second interrupt annoyance
From: Carolyn Scheppner CATS
Date: Mon, 11 Jul 1988 21:41
Date: Mon, 11 Jul 1988 21:41
44 lines
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1566 bytes
In article <3183@crash.cts.com> haitex@pnet01.cts.com (Wade Bickel) writes:
>
> Hi Carolyn,
>
> What is this "_custom" your speaking of and where is it
> documented?
It's the address of the custom chips.
It's defined in amiga.lib and is the address of the custom chips as
C programmers reference it:
1. from C
#include "hardware/custom.h"
extern struct Custom custom;
2. Asm equivalent
XREF _custom
lea _custom, a0
3. Other way (hardcoding it in your source)
The asm examples in the hardware manual use an EQU instead...
CUSTOM EQU $DFF000
Remember though - the last thing you must do in your server is to
load d0 with 0. You must exit server with Z flag set (as documented
in the AW RKM Exec).
--
==========================================================================
Carolyn Scheppner -- CATS Commodore Amiga Technical Support
PHONE 215-431-9180 UUCP ...{uunet,allegra,rutgers}!cbmvax!carolyn
Pad with zeros for a light, airy program.
==========================================================================
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!att!ihnp4!cbmvax!carolyn From: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS) Newsgroups: comp.sys.amiga.tech Subject: Re: Problem with double-buffering and some 1-second interrupt annoyance Message-ID: <4229@cbmvax.UUCP> Date: 11 Jul 88 21:41:41 GMT References: <3183@crash.cts.com> Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS) Organization: Commodore Technology, West Chester, PA Lines: 44