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Date: 2002-06 atari800xl.org comp.sys.atari.8bit
An unusual 1050 problem  
 
1.  richard cortese  
 More options Jun 1 2002, 8:50 pm
Newsgroups: comp.sys.atari.8bit
From: "richard cortese" <ricor@earthlink.net> -
Date: Sat, 01 Jun 2002 11:50:06 GMT
Local: Sat, Jun 1 2002 8:50 pm
Subject: Re: An unusual 1050 problem
| | | | | |
"LLpwhite" <llpwh@cs.com> wrote in message

...

> Can anyone shed any light on this?  I have never seen a mechanism that
failed
> in this manner.  Also, a bad 2793 and mech?  Doesn't seem likely.

If you have another one laying around I would suggest trying to swap out the
6532/RIOT 40 pin chip. I've only seen 2 go out so it is a pretty rare
problem, but the symptoms kind of look like what you are seeing.

 
 
2.  LLpwhite  
 More options Jun 12 2002, 11:33 pm
Newsgroups: comp.sys.atari.8bit
From: llpwh@cs.com (LLpwhite) -
Date: 12 Jun 2002 14:32:15 GMT
Local: Wed, Jun 12 2002 11:32 pm
Subject: Re: An unusual 1050 problem
| | | | | |
For the folks that offered suggestions, thanks very much.  I decided to tackle
this drive  again today (the last repair session lasted until  around midnight
a couiple of weeks ago.)

In the clear light of  a new day, I found the problem (he sheepishly reported).
 One end of the new 2793 was not completely seated in its socket.  I re-seated
it and then powered up the drive, and it now works perfectly.  So it was only
the 2793 that was the original problem (other than the repairman!)
Larry


 
Pinouts from 7800 cart Roms  
 
1.  Torsten Schall  
 More options Jun 1 2002, 10:44 pm
Newsgroups: comp.sys.atari.8bit
From: inf@worms.fh-rpl.de (Torsten Schall) -
Date: 1 Jun 2002 13:28:38 GMT
Local: Sat, Jun 1 2002 10:28 pm
Subject: Pinouts from 7800 cart Roms
| | | | | |

Hi 7800/XLE nerds,

i've two little problems (they are nearly the same)!

Problem one 7800:
I wanted to burn some of the prototypes i found in the internet but couldn't
find any docs about the bankswitching cartrides (7800) and the used rom types.

   I could modify a Xevious 32KB cart to run the internet version of Xevious and
   Pete Rose Baseball, everything (X/PRB) burned on a 27256.
Now i am trying to burn some 128KB games on rom and use a different cart
Scrapyard Dog/Karateka.

How are the banks switched?

I also wanted to read out my original roms, what is the pinout of the roms that
Atari used in the 7800.

Problem two XLE:
I need the Pinout/Chip type for the Atari XLE Supercartridges.
I am !!!!trying!!!! to modify some games.

I have the 1MBit Rom Emulator with the the doku/info from John Skruch/Atari.
They used 27128 eproms for the banks.

This info is on the homepage of Jindrush
look XEGS carts.

I am very happy about every info that helps me to go on.

Thanks, happy Atari 8 Bitting

PS: I looked at many 7800 homepages but the don't described the functions of the
jumpers nor the pinout of the used roms.

--
Mit freundlichen Gruessen

Torsten Schall
E-Mail: Torsten.Sch@fh-worms.de


 
 
2.  Glenn Bruner  
 More options Jun 2 2002, 7:33 pm
Newsgroups: comp.sys.atari.8bit
From: "Glenn Bruner" <glenn.bru@verizon.net> -
Date: Sun, 02 Jun 2002 10:33:33 GMT
Local: Sun, Jun 2 2002 7:33 pm
Subject: Re: Pinouts from 7800 cart Roms
| | | | | |
Torsten,

Your right, there isn't much documentation about the 7800 cartridges.  About
the best info I found was on Dan Boris web site.  He has some descriptions
of the type of boards used in some 7800 cartridges he has taken apart.  This
would give you at least on idea of  which cartridge (if you have extras of)
to rip apart and use.

The basic premise behind 7800 bankswitching evolves around the use of a
74LS373 or 74LS374 depending on the type of cartridge it is found on (Super
Cart 1 or Super Cart II or Supercart III).  J.A. Valdez was the Atari
engineer whose name I saw associated with a lot of the 7800 cartridge
designs.

The 373 or 374 is used as a high address line switcher.  Data lines D0 - D2
are used to select one of 8 possible banks.  A bank can be selected by
writing a value between 0 and 7 to any address in the range of $8000 -
$BFFF.  Bankswitching on the 7800 is described in the 7800 Developers
manual.

Bank 0 thru 6 reside in the $8000 - $BFFF region of 7800 memory.  These
banks correspond to the various 16k chunks in an EPROM.  For example a
27C010 EPROM can hold 128K bytes of information.  It can also be looked at
as eight 16K byte banked ROMs. So banks 0 thru 6 will be these 16K byte
banked parts of a 27C010.

Bank 7 is mapped to $C000 - $FFFF region of memory.  And is also the last
16K byte chunk of a 27C010 (if the game goes on a 1Meg ROM).

You can also have extra static RAM on the 7800 cartridge or extra ROM.  This
RAM or ROM is mapped to the $4000 - $7FFF region.  The RAM is either a 6264
(8k byte) or a 62256 (32k byte) static RAM chip.  16k chips were never
developed, that's why a 32k is used (in fact the 7800 developer board does a
neat trick by using that extra 16k to store the debugging code).  And the
ROM chip is typically a 27128 EPROM.

One big problem with the 7800 game boards that use 1Meg of ROM space is that
they were designed for Mask programmable chips only.  Meaning that the chip
is program when the chip die is made (hard coded into the chip).  The chip
is only 28 pins in size.  All EPROMs of that size are 32 pins.  So you have
to do some creative soldering to make it fit.  Fortunately, the majority of
the pins are in relative same position if you align the chips from their
bottom ends (pins 14/16 and 15/17 end; opposite end of the notch).

Besides the Supercarts on the 7800 there is the 32k and 48k carts.  The 48k
cart is just a modified 32k cart.  So depending on the size of the game and
it's memory requirements, there are lots of choices on the 7800.  There a
web site out there that also has a hardware hack for the 7800 to allow you
to dump carts onto a PC and convert a basic 7800 cartridge into a 32k byte
storage device to do hobbyist level programming on it.

I believe the XEGS Super Carts do some of the same basic switching except
that it's confined to the cartridge port memory in the Atari 8bit.  It uses
a 74LS374 type of chip and the Cartridge Control Line,  CCTL signal, to do
the switching with.  Switches out a 16K bank at a time.  The XE Demo Cart is
neat in it's ability to switch between games by doing a power cycle on the
computer.  Uses a capacitor as a power source to keep the memory circuit
alive long enough to remember what game it was on before power was turned
off.

Well, I hope I gave you enough information to move on with your project.
Good luck.  I'll email you a chart that I have on a 7800 cart jumper
settings that I have in a Word document.

Regards,
Glenn Bruner
glenn.bru@verizon.net

"Torsten Schall" <inf@worms.fh-rpl.de> wrote in message

...



 
New files on Holmes Website; Utility ATRs  
 
1.  Thomas Havemeister  
 More options Jun 2 2002, 2:03 am
Newsgroups: comp.sys.atari.8bit
From: Thomas Havemeister <t@gmx.de> -
Date: Sat, 01 Jun 2002 19:04:08 +0200
Local: Sun, Jun 2 2002 2:04 am
Subject: Re: New files on Holmes Website; Utility ATRs
| | | | | |
On 30 May 2002 14:51:34 GMT, dun@aol.com (DunxUK) wrote:

>Very welcome stuff from Holmes;

>

yes, this one rulez :-)

bye sez
\thomsen

--
Sturz des Zaren & Take those Atarian care!
Thomas Havemeister, Student of Commercial Information Technology
Technical University of Ilmenau


 
New files on Holmes Website; Game Archive Overhaul  
 
2.  Aaron  
 More options Jun 7 2002, 7:15 am
Newsgroups: comp.sys.atari.8bit
From: "Aaron" <holmesat@hotmail.com> -
Date: Fri, 7 Jun 2002 10:15:02 +1200
Local: Fri, Jun 7 2002 7:15 am
Subject: Re: New files on Holmes Website; Game Archive Overhaul
| | | | | |
Just to let everyone know, all the games that were on my 'have' list have
been uploaded and put online, all 4000+ images, sorry for the 'seperate'
disks, just alot easier for me to get them up to share.  This is the first
MAJOR update of the games on my site for over a year. :-)  All older dumps
have been replaced with either new dumps, or better versions.  Heaps of new
cheat versions of games too.  Anyway, go grab some games...


or

Keep those 8bit's humming!

Holmes...

"DunxUK" <dun@aol.com> wrote in message

...


 
Steve Dong Heavy Metal  
 
1.  russg  
 More options Jun 2 2002, 11:20 pm
Newsgroups: comp.sys.atari.8bit
From: "russg" <r@en.com> -
Date: Sun, 2 Jun 2002 10:18:42 -0400
Local: Sun, Jun 2 2002 11:18 pm
Subject: Re: Steve Dong Heavy Metal
| | | | | |
Ron, Dan, Andreas.
Thanks for the responses.  I'm outa town, calling long distance
so I can't respond just now.  I'll get back.
Russg

 
Pokey Gumby Bypass switch info request  
 
1.  Guy Ferrante  
 More options Jun 3 2002, 1:22 am
Newsgroups: comp.sys.atari.8bit
From: "Guy Ferrante" <GuyFerra@cfl.rr.com> -
Date: Sun, 02 Jun 2002 16:22:41 GMT
Local: Mon, Jun 3 2002 1:22 am
Subject: Pokey Gumby Bypass switch info request
| | | | | |
Hi,
Im looking for any info on the Pokey Gumby bypass switch,  Please send info
or link.

Thanks

-Atari8man-


 
 
2.  Andreas Magenheimer  
 More options Jun 7 2002, 12:39 am
Newsgroups: comp.sys.atari.8bit
From: Andreas Magenheimer <magea@students.uni-mainz.de> -
Date: Thu, 06 Jun 2002 17:43:41 +0200
Local: Fri, Jun 7 2002 12:43 am
Subject: Re: Pokey Gumby Bypass switch info request
| | | | | |
Well,
I have it - err at home. Send you a copy next week...   -andreas.

Guy Ferrante schrieb:


 
Which system should I buy 800XL or 1200XL? HeLP!!  
 
1.  buckle64  
 More options Jun 3 2002, 1:32 am
Newsgroups: comp.sys.atari.8bit
From: buckle64 <e@home.com> -
Date: Sun, 02 Jun 2002 16:32:26 GMT
Local: Mon, Jun 3 2002 1:32 am
Subject: Which system should I buy 800XL or 1200XL? HeLP!!
| | | | | |
I have the opportunity to buy either a 800xl or a 1200xl I can only buy one
of them and they are both the exact same price, which should I get?  
Reasons?  I will do some quick research on the differences by searching the
web, but I figured I would search the great source of this newsgroup.

Thanks guys!


 

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