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| From: Solder (all posts)
Date: 1999-02-12
Subject: Re: Plus/4 EPROM File
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On Fri, 12 Feb 1999 09:09:48 +1030, Nehme, Claude wrote:
Hi Claude,
sorry for my late answer, I was very busy.
>Can anyone send me an example of a file that can be wriiten to an EPROM to
>be plugged into a Plus/4 ROM socket, and is able to be executed by the
>Plus/4.
This is not easy and it will only work in assembler. At first every EPROM-file (burnfile)
for a modul starts with 2 jump-commands. The first is at $8000 to initialize the module
(F-key, start-programm...), the other at $8003 to start it (from the start-programm). At
$8006 is a byte for the type of the module: $00 is basic, $01 is autostart (most game-modules). All other modules have other values. From $8007-$8009 stands cbm to detect the module. You must have this, otherwise the kernal-routines will ignore your EPROM.
A good idea is to look in my documented modulheaders. They includes all routines to initialize a module and copy programs from the EPROM to the RAM and start them.
There is a program called "Modulgenerator" to create the burnfiles for the EPROMs written by me. But this program is for the EPROM-/sRAM-expansion or the cards. It creates files from $8000-$ffff, that means, that it can't create files for your (only)
2764-EPROM ($8000-$9fff). But I can insert a dialog to decrease the end to a lower adress for smaller EPROMs. The program is for 256kb-RAM-plus/4. It works with
64k-plus/4 if you use only one bank. It's easy to insert programs. Some month ago I wrote english instructions for this program. I will upload it to my homepage http://surf.to/solder click at plus/4 and software.
Christian (Solder/Synergy)
You will find infos for Commodore plus/4-homecomputers, OS/2-Warp, swap MP3's on my homepage http://surf.to/solder ICQ#: 22440587
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