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Found 11 results

  1. I was pouting over the lousy 64KB of ram in my 65XE the other day and decided to look into expansion options. It's one of those without the ECI port, so it would need to be an internal unit. Looking at what was out there, I wasn't very happy. How about I try my own hand at it? Here's my initial thoughts on the matter. The idea is 1) it must use the "standard" CIA PORTB for bank control, 2) it cannot interfere with the normal operation of any of the bits, and 3) it should support CPU/ANTIC bank control. I looked at the memory available online... what do you know, there's a 2Mx8 5V 45ns SRAM from Digikey for about $5. Two of them would fill out a full 8 bit bank select just peachy. But how do you get 8 bank address lines from the port without interfering with the operation of the bits? A latch comes to mind. And that's the main thing - a hex D-Type flip-flop. Clearing PB7 will clear the latch, so asserting the self-test ROM will just clear the latch. No problem there. I use PB6 as the flip-flop clock (latched on rising edge). So if this were in an XEGS, clearing PB6 enables the Missile Command rom, which wouldn't be an issue as long as the code to switch banks isn't in either the bank memory space or in the rom cart space. No problem there, either, especially on systems without Missile Command. I use PB5-0 as the inputs to the d-flip-flops... no problems there as long as the code to switch banks isn't in bank memory space, the cart space, or the OS ram space... so in the first 16KB; oh, and the ints are off unless you keep the int code and data in the first 16KB as well. Still not an issue. But how do I get 8 bank address bits from 6 latched bits. Well, just use PB2 and 3 as normal. The latched bits extend them from 2 bits to 8 bits. Use A21 and it's inverse to select one of the two sram chips, use PB4 and 5 along with A14 and A15 and /HALT to generate the other chip enable, a few gates for output enable and write enable and Bob's your uncle. The prices in the pic are from Digikey in single unit quantities for surface mount parts. A handful of bypass caps to round it out at less than $15 in parts... minus the board. That's gonna be the "fun" part. Been a while since I made a board. I'll update as I get further along. Comments and suggestions are appreciated.
  2. So there is a good deal on a 1200xl locally. $60 obo complete in the box along with a basic programming cart,rf cords,and the power supply. Issue is I'm only really interested in playing games on it and I have heard that it has compatibility issues. What do you think?
  3. So I might be buying this Atari 800XL and all these extras in the next few days. Problem is, I'm not sure what it's worth. I've sold computers like this in the past and they seem to vary in price tremendously which renders my information on them skewed. So what is all this worth? Just judging what you can see of course. I'll include the description the seller gave me as well. Please help! "Here is a pic of the system in the box. The box does have a rip that was taped. I would have to look to see what pieces I have but I am pretty sure I have the disc drive & the modem. This was mine when I was growing up.....just a few years ago " "Here is what I have a disc drive, the box that connects them, 2 joysticks & a printer. I also have the books that came with the disc drive & the computer & a book of programs. I remember spending HOURS typing those things in to watch a dot go across the screen. How times have changed!!!" She is thinking somewhere around the $80 mark, which I think is a good price, but how good exactly? Any information helps. Thanks!
  4. For those of you still needing to fill that Tigervision hole in your 8-bit Atari collection, there's a 'Matterhorn' up now: http://www.ebay.com/itm/Matterhorn-HOLY-GRAIL-for-Atari-8-bit-Computers-400-800-XL-XE-ONLY-SEVEN-KNOWN-/111629975616? Not the crème de la crème, but rare as sin nevertheless.
  5. Hi all, I would like to put a SIO2SD inside 600XL that would be controlled by the aluminum function keys. Is it possible to bypass the function keys to control the sio2sd by adding a pushbutton (N.O) on the 600XL which would be used as the "FN" key on the PC laptops? I am not an electronics expert, if someone could help me ... Thanks
  6. Here is my list of spares, for sale, for trade: http://www.classic-consoles-center.at/s__tradesell.pdf Prices are in the list. And I will be happy to trade.
  7. Does anyone remember the game "Chicken" on 800xl, I used to play it daily it had really simple gameplay similar to frogger and was very addictive. I'm wondering if anyone has done a 5200 port, I would love to have the rom on my atarimax sd cart! If there isn't a conversion for "chicken" maybe a port of "freeway" from the 2600 system?
  8. hello im listing some very rare atari NOS (NEW OLD SEALED ) stuff today. please see my lates ebay listings here : https://www.ebay.de/sch/m.html?_odkw=atari&_sop=3&_ssn=retronrare2014&item=162664594560&_osacat=0&_from=R40&_trksid=p2046732.m570.l1313.TR5.TRC2.A0.H0.Xatari+800.TRS0&_nkw=atari+800&_sacat=0 some Atari 400/800 titles are : FROGGER - CARTRIDGE (NOS) MAD-NETTER (TAPE) (NOS) ZAXXON (TAPE) (NOS) PITSTOP (TAPE) (NOS) DIMENSION X (TAPE) (NOS) ADVENTURELAND (TAPE) (NOS) BLUE MAX (TAPE) (NOS) Atari 2600 / 5200 Cartridges: Rescue on Fractalus! (NOS) - ATARI 5200 RIVER RAID SKATE BOARDIN Robot Tank etc. rare BREAK DOWN from Dynamics Hamburg still avaible : ) have phun
  9. I bought this in Colorado and I am very pleased with my buy, . $150 for the system, manuals, BASIC Programming package, 4 controllers, and 8 carts. I haven't done too much with it yet, but I have ALWAYS loved this system! "Scribble" the built in "game" reminds me a lot of Video Easel for the Atari 8bits. Who wrote VE for Atari? Who wrote Scribble for Bally? Do the Bally controllers work on an Atari or Genesis or Vice-Versa? What do I need to know about this system? How come it doesn't have a sub-group here on AA?
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