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Member Since 30 Dec 2003
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#4251260 RCA audio issue: forcing mono to both speakers..how?

Posted by kheller2 on Wed Apr 3, 2019 9:33 PM

Here is my collection of cables:

Center cable: female stereo rca to female 3.5 stereo ? If yes then you just need a mono female rca to stereo male rca splitter. Done.

You can test that cable now by plugging the white Atari cable into each line on the center cable to see if the sound comes out one speaker then the other

#4251186 XF551 3.5 Mod

Posted by kheller2 on Wed Apr 3, 2019 7:23 PM

Will a 5.25 drive work with the Hyper XF version B EPROM or do I have to change EPROMs everytime I try out a different configuration?


A is for 5.25, B is for 3.5

#4250451 Atari 8-bit machines comparison table

Posted by kheller2 on Tue Apr 2, 2019 8:53 PM

Gonna need to be a bit more detailed and thus confusing. The NTSC 600XL has composite? The non-NTSC 65XE has ECI. The 800XLF has svid (I think).

#4248685 New Atari 8-bit scans and video

Posted by kheller2 on Sun Mar 31, 2019 12:55 PM

Random thoughts on Atari 600XL Product Status Meeting Handout


Having read through this just today, I took some notes on the tree I killed while printing it.  I did duplex it, so don't yell.  :D


Expansion bus:  Composite Video In/Out, 5200 "PAM" External Adapter seemed to be a driving influence. "External Video and Audio inputs may thus be applied and will appear on the television screen (or at the speaker).  External Video Monitors and Audio Amplifiers may be interfaced via the PBC."


FRED seemed to be a large requirement for the project -- yet FRED wasn't really ready/in use until the 1400's in late 83 and then not again until the XLF/XE.  What delayed the use of FRED for so long (1984) since it was scheduled for competition 4/83.  "Entire project could sleep 6 weeks if 1st pass FRED does not work"  Which FRED is this btw?  The 48 PIN one is listed in the parts list.  "The FRED custom chip will make possible a low-cost PAM adapter, which would include, in an external unit, PAM controller interface, and PAM O/S ROMS" and "[the OS ROMs] can be disabled vi the Fred chip, under program control, and a different O.S. can be loaded from peripherals"  So phat FRED was killed for narrow FREDDIE I guess.


PORKEY was slated for 2/83.  


RUFUS seemed to be the 16K x 8 ROM.  Is this the codename for the 16K XL OS?  It also was the most expensive chip.


ROSE was a ROM+PIA hybrid due in May


Battery Eliminator = DC Power supplies.  (New phrase for me!)


CGIA - "Later versions of the LIZ unit will have the Antic and GTIA chips integrated into one LSI chip"


LIZ - will initially use the A800 10K ROMs


Keyboard interface will be the same as the A800 and A1200 but matrix will be different due to Porky


The documentation starts using "S-16" halfway through and veers off from the Crazy8 concept a bit.  Some parts talk about eliminating the Function keys, other parts talk about using them.


16K system has one power LED

64K system has one power LED + 2 others    (where have I seen this before? Oh yeah, the 1400XL vs 1450XL pictures in the XL product brochure)


The PBC/PBI interface is very different pin/out from what eventually came out on the 600XL/800XL  And several additional signals are present.


The most expensive component of the project was the keyboard.  Three suppliers: ALPS, SUN-ARROW, MITSUMI



All in all an interesting read.   :thumbsup:

#4247452 Duplicating Technologies

Posted by kheller2 on Fri Mar 29, 2019 12:19 PM

I might have version 3, 4 and 5 of the these docs.  I thought I uploaded them in an old thread.  

#4245072 We Love Atari (Volume One)

Posted by kheller2 on Mon Mar 25, 2019 8:40 PM

Got my copies today!! Now to find time to read it instead of drooling over all the pictures. I want volume 2. *pout*

#4242944 Heavily modified 800XL

Posted by kheller2 on Fri Mar 22, 2019 10:18 AM

Will need to fix those slider switches by the joystick ports, one looks salvageable.. the other not so much.  wonder what they do.

  • slx likes this

#4241936 XF551 3.5 Mod

Posted by kheller2 on Wed Mar 20, 2019 7:14 PM

DS0 is correct for systems other than a PC.

#4241668 Ape 3.0.2 not working?

Posted by kheller2 on Wed Mar 20, 2019 12:36 PM

I will have to say that the plus side to APE it that I purchased it years and years ago for whatever it cost then and ever since I've gotten every update and driver update as part of that original fee.  That is one of the big things I like about it.  I have several SIO2PC devices from Steve that I've purchased over the years to use with APE, but I only ever purchased APE once.  I'm very happy there isn't a versioning fee with every maintenance release.


Having said that... you can't beat for free RespeQt

#4241052 Atari 1090XL

Posted by kheller2 on Tue Mar 19, 2019 11:32 AM

I just found this stuff. I have no idea how I came across it. Specs for the 1090XL.



"Original" PDF's off all those in one document are here: https://www.bitsofth...m/?page_id=1400

#4240624 XF551 Mixed-Original Parts Bare PCBs

Posted by kheller2 on Mon Mar 18, 2019 4:41 PM


Yeah, don't do that. 1.44MB disks have a different coating than 720KB disks, and will be very unreliable as a 720KB disk.


Wouldn't you also run into similar issues that 1.2 vs 360 5.25 disks have with the RW head power and track width?


All this reminds me of the evil I went through with 2.88 3.5" floppy drives... EVIL!!!

#4230600 400/800 Commercial Memory Upgrades

Posted by kheller2 on Sat Mar 2, 2019 1:08 PM



   Hey!  You just solved a mystery for me as I have one of those and without any markings I've never been able to find any info on it.  You are the only person I know who has one as well.   Could you possibly scan the pages and post them?   I would like to be able to print them out to put with the board.




This prints well.  Let me know if you need better.  This is 600x600 DPI B/W.

Attached File  anderson02032019.pdf   4.14MB   41 downloads

#4225963 Atari800 and saving to disk

Posted by kheller2 on Sat Feb 23, 2019 4:14 PM

ATR is a container type  ;-) not necessarily a filesystem type. 

#4218959 Five 1050's - determining upgrades and diagnostics?

Posted by kheller2 on Tue Feb 12, 2019 9:44 PM

If the 1050 drags fail, you have something other than stock.

#4214618 Idea:External Atari ST drive transformed to 8-bit (XF551 internals)

Posted by kheller2 on Wed Feb 6, 2019 7:09 PM

Hmm... I was thinking that there would still be the standard ST port to daisy chain a 2nd drive.   :grin: