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Member Since 30 Dec 2003
OFFLINE Last Active Today, 6:29 AM

Topics I've Started

APX Boxes

Thu Jan 10, 2019 3:22 PM

I've seen many APX titles that come in white cardboard boxes... but did they ever come in a hard plastic container like this?




Largest quantity of a single Atari device

Wed Jan 9, 2019 8:01 PM

After rummaging around in the basement the past few days I discovered that I had a rather large stash of specific pieces of Atari gear. Now I cant compete with Kline's 50 some 1200XLs, but I do have at least 24 1050s, maybe six boxed. 3 completely boxed XEGMs. Maybe 8 800s.

So what is the largest amount of Atari gear you have stashed?

XF551 Schematics

Thu Oct 25, 2018 5:58 PM

Just to keep things lively, this is the set of all (known to me) XF schematics.  Maybe this way I can find them easier the next time I look for them.  ;-)


Mariusz Geisler

Attached File  sch_xf551.gif   40.08KB   16 downloads


From: http://blog.3b2.sk/i...TARI-XF551.aspx

Igor Gramblicka V1 

Attached File  xf551ver1_102.GIF   52.48KB   16 downloads


Igor Gramblicka V2

Attached File  xf551ver2_101.GIF   49.53KB   18 downloads



From: https://atariwiki.org/wiki/Wiki.jsp?page=Atari%20XF551 

Atari Japan Preliminary

Attached File  XF551_schematic.pdf   59.05KB   58 downloads




And from the FAQ:

The reverse side of a 2-sided "flippy" disk may be used by inserting the disk into the drive upside-down.

 But note:

    Chinon-built XF551--CANNOT read/write/format disk backside if the disk has no 2nd timing hole
    Mitsumi-built XF551--CAN read/write disk backside if the disk has no 2nd timing hole, but CANNOT format the backside without the 2nd timing hole.

DOS, Disks, Density and Sector counts... education question.

Fri Aug 31, 2018 1:18 PM

Why couldn't one create 26 double density sectors? Not enough physical media space per track?


Poking around the Internet I couldn't find a well articulated discussion on exactly what is different on the physical media, let alone magnetic data portion, of a SD sector vs a DD sector.  The reason I'm going down this strange path of thinking was how could Atari squeeze 26 sectors for their Enhanced/Dual Density format with SD sectors.  


I also saw that SD is done with FM, and DD with MFM.  I'm assuming that ED was done with MFM but then ED disks are readable in an 810 drive which, I thought was only FM.


I also read that there is absolutely no difference between a SD and a DD disk when it comes to magnetic formulation. I find this a bit questionable given my experience with SD disks and that there is a major difference between DD and HD.


Can someone hit me with a stick and educate me?




2609 vs 2609A and a few questions about them...

Sun Aug 5, 2018 8:24 AM

I'm not an Intellivision gamer by any means but i do happen to have two nice units and recently considered selling them along with maybe two dozen or more boxed games.  I noticed one was a 2609 and the other a 2609A.  I have yet to find any technical details on the difference between these two units other than an off handed mention they use different screws.  I didn't see anything in the FAQ either. So what is the difference?


I also noticed that the controllers fit snugly into the 2609 but not the 2609A plastic.  On the 2609 they almost become part of the case, where on the A they extend out the side just a hair. Also, of the four controller (two on each unit) one of them does not have a lip at the top of the controller but is rounded smooth.


And I also noticed that on the 2609 unit the controller cables are excreting an oil but the 2609A's are not.  These units have been packed away and stored in climate controlled rooms for decades, so I don't think its an environmental issue.