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Re: Extending RAM with arnold or xcpc

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Le 21-05-2017, Matthew Phillips nous expliquait dans 
comp.sys.amstrad.8bit
(<e7bc9b3f56.Matthew@sinenomine.freeserve.co.uk>) :

> In message <ofqi7n$jap$1@golgoth99.redatomik.org>
>  on 21 May 2017 Doug713705  wrote:
>
>> Hi all,
>> 
>> I'm using different CPC emulators on a Linux host:
>> - arnold
>> - xcpc
>> - rwcpc (in a dosbox)
>> 
>> All of them a running perfectly using the PARADOS rom.
>> 
>> Now, i'm trying to run a demo that is stored on a .dsk file that is a
>> extended DSK format.
>> 
>> After inserting it, I can list the content of the disk with the cat
>> command but I can not run any programm on it because of lack of RAM.
>
> Could you tell us which model of CPC you are emulating? The RAM available
> does depend on the model (e.g. 464, 664, 6128).

Oh sorry, this is a 6128.

> And how much RAM have you available in the emulator?  The Amstrad had various
> RAM expansion modules available, such as those by dk'tronics, and some of the
> emulators will emulate RAM expansion packs.

Now with cpcemu, I have 576KB RAM and this allowed me to run the demo.

>> My questions are:
>> - Is it possible to extend RAM with all or some of the emulator listed
>>   above ?
>
> Your problem may not be anything to do with how much RAM is configured in the
> emulator. Most demos will have worked with the CPC 6128 without any
> additional RAM as having RAM expansion on that machine would have been rare.
>
> I think it is more likely that the problem results from the ROMs you have
> installed on the emulator. You could try using AMSDOS instead of PARADOS.
> Also make sure that you disable any other ROMs you might have (e.g. Protext,
> MAXAM) before running the demo.
>
> ROMs usually take a little bit of RAM work their workspace, and it could be
> that the demo is very tight in the main RAM. The Z80 can only address 64K of
> RAM natively, with additional RAM being paged in, usually in the &4000 to
> &7FFF address range. This makes the RAM in the range &8000 to &BFFF
> particularly valuable as that is where the firmware jump blocks are, and any
> working space needed by the disc ROM and other ROMs.

The problem was a RAM problem, solved by using cpcemu which allow memory
extension up to 576KB.
From the demo creator Parados is needed to run it.

> If you could tell us what the demo is, and where you got it (if the DSK file
> is available online) then other people can say whether they have trouble
> running it too.

The demo is not an old demo, in fact this demo is a new one made by a
friend for the Toulouse Hacker Space Factory, a hacking festival in
Toulouse, south of France.

https://www.thsf.net

The demo itself can be downloaded from here (WIP):
http://www.pouet.net/prod.php?which=70063

This demo may not be what you can expect as a demo :)

Thank you for your help.
-- 
Et j'attends que se dressent vos prochains charniers
J'ai raté l'autre guerre pour la photographie
J'espère que vos macchabées seront bien faisandés
                    -- H.F. Thiéfaine, Aligator 427

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Thread

Extending RAM with arnold or xcpc Doug713705 <doug.letough@free.fr> - 2017-05-20 23:07 +0000
  Re: Extending RAM with arnold or xcpc Matthew Phillips <spam2011m@yahoo.co.uk> - 2017-05-21 09:19 +0100
    Re: Extending RAM with arnold or xcpc Doug713705 <doug.letough@free.fr> - 2017-05-23 08:07 +0000
  Re: Extending RAM with arnold or xcpc Kevin Thacker <kev.thacker@gmail.com> - 2017-06-01 05:55 -0700
    Re: Extending RAM with arnold or xcpc Doug713705 <doug.letough@free.fr> - 2017-06-02 06:35 +0000

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