Re: A83: Menus & ZMENULIB

To: Alan C Johnson <assembly-83@lists.ticalc.org>
Subject: Re: A83: Menus & ZMENULIB
From: Linus Akesson <lairfight@softhome.net>
Date: Mon, 05 Oct 1998 19:57:36 +0100
Delivered-To: assembly-83-outgoing@towerguard.unix.edu.sollentuna.se
In-Reply-To: <19981004.204846.-177989.1.benjamin99@juno.com>
Reply-To: assembly-83@lists.ticalc.org


Ok, I'll ul it to ticalc. Look for MenuLib83.zip.

Linus

On 05-Oct-98, Alan C Johnson wrote:

>I can't read attatchments.  How can I get these progs?

>>Hello.
>>
>>The menus play a big role in the TI-83 operating system. Some would 
>>say it is
>>the very core of the user interface. So how come we can't use it from 
>>asm?
>>
>>The answer is simple; the menu routines accept 1 byte that specifies 
>>which
>>menu to put up. All menu-related rom calls read this 1-byte menu code, 
>>and
>>look up the rest in tables found in ROM. All menu-related rom calls 
>>check
>>this byte to see whether they should display the reset warning 
>>message,
>>whether they should build a program list etc. And all menu-related rom 
>>calls
>>refer to these hardcoded ROM tables and cannot be fed with pointers 
>>into ram.
>>
>>The BASIC menus? Well, it's indeed complicated. You have to create 
>>several
>>temporary string variables, push them onto the fpstack, push the names 
>>of the
>>BASIC labels to jump to, all with proper memory checking and error 
>>handling.
>>And then you still get the ugly every-other-dot run inicator turned on 
>>all
>>the time. And then it doesn't work either. =)
>>
>>There is only one solution to this (which Pat has actually told us). 
>>To write
>>your own menu routines. And I've done that.
>>
>>ZMENULIB is a 395 bytes big file, containing ready-to-use menu code. 
>>It is
>>NOT a sos library. Instead, you have to look the program up, and jump 
>>to the
>>beginning of it. This way, it can be used by shell-independent 
>>programs (AND
>>sos programs of course).
>>
>>Please have a look at the attached files; try running menutest.83p 
>>(Send9),
>>and then look at its source code. There is also a brief description in 
>>the
>>readme file.
>>
>>Enjoy.
>>
>>Linus
>>

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References:

Re: A83: Menus & ZMENULIB

From: benjamin99@juno.com (Alan C Johnson)