Bank switching and the XL/XE

Bank switching and the XL/XE

Post by morlo » Wed, 27 Jan 1999 04:00:00



Does anyone have available the bit settings for accessing via the OS and
ANTIC the "extended" RAM of the 256K and/or higher XL/XE computers? I have
the settings for the 130XE's 128K scheme, but need it up to the 1088K bank
(PORTB settings)
 
 
 

Bank switching and the XL/XE

Post by Mathy Van Nisselr » Thu, 28 Jan 1999 04:00:00



Quote:

>Does anyone have available the bit settings for accessing via the OS and
>ANTIC the "extended" RAM of the 256K and/or higher XL/XE computers? I have
>the settings for the 130XE's 128K scheme, but need it up to the 1088K bank
>(PORTB settings)

There is only one 1088k upgrade that will let you use CPU and ANTIC banking
separetely.  And that's mine  :-)))

This is the page sequence I hope you will support:

$00-$0F, $40-$4F, $80-$8F, $C0-$CF

CU                      Mathy van Nisselroy

 
 
 

Bank switching and the XL/XE

Post by Raphael James Espin » Thu, 28 Jan 1999 04:00:00



> Does anyone have available the bit settings for accessing via the OS and
> ANTIC the "extended" RAM of the 256K and/or higher XL/XE computers? I have
> the settings for the 130XE's 128K scheme, but need it up to the 1088K bank
> (PORTB settings)

Unfortunately different upgrades use different bit combinations for
accessing extended RAM, so the specifics will vary according to the
upgrade.  A good place to look for information is at the BRiTiSH
Underground site:
http://aegis.mcs.kent.edu/~clisowsk/8bit.html

There's upgrade information for 256, 320, 512, 576 and 1088K
modifications there.  Also not all upgrades allow ANTIC to access the
extended RAM, most just allow the CPU access.

All XE compatible upgrades use bit 4 for enabling the extended RAM to
the CPU, and bits 2 and 3 for selecting the extended bank.  Larger
expansions then start using up the other bits in PORTB, bit 6 (the
last remaining unused bit in PORTB) is the next one to be used, then
generally bit 5 (you lose separate ANTIC access to extended RAM), bit
7 (Self Test enable), and finally bit 1 (you lose BASIC).  An
exception to this is Mathy van Nisselroy's new 1MB upgrade, which
keeps bit 5 for separate ANTIC access to extended RAM, and uses bit 0
(OS RAM enable) instead while still being able to toggle BASIC and OS
RAM when main is enabled RAM.

--

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1. S: XL/XE SPIELE! / W: XL/XE games

Howdy !

ich suche einige seltene Atari 400/800/600XL/800XL/800XE/130XE Computerspiele
:

das w?ren :

        Koronis Rift ( Lucasfilm Games Ltd. )
        Alternate Reality : The Dungeons
        Alternate Reality : The City
        Infocom Computerspiele ( z.B.
                                        - Moonmist
                                        - Hitchicker`s guide to the galaxy)
        Ballblazer
        Ultima 1-4
        Mercenary (Diskversion)
        Kick Off
        Silent Service
        Solo Flight II
        Spy vs. Spy II
        Colossus Chess
        Ogre

--------------------------------------------------------------------------------

Howdy !

I search several really rare games for Atari 400/800/600XL/800XL/800XE/130XE

for example:

        Koronis Rift ( Lucasfilm Games Ltd. )
        Alternate Reality : The Dungeons
        Alternate Reality : The City
        Infocom games  ( for example :
                                        - Moonmist
                                        - Hitchicker`s guide to the galaxy)
        Ballblazer
        Ultima 1-4
        Mercenary (disc version)
        Kick Off
        Silent Service
        Solo Flight II
        Spy vs. Spy II
        Colossus Chess
        Ogre

-peter

============================================================================


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