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Nezgar

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About Nezgar

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  1. 800XE is a 65XE on a 130XE motherboard, PAL only production. 64K only. Were these commonly with a bad GTIA? A bit from the FAQ: The Atari 800XE was announced (not by name at the time) in March 1987 in West Germany, and shipped later that year as a regional (West Germany, Austria, Switzerland) complement to the Atari 65XE and 130XE. The 800XE name was selected in a marketing attempt to capitalize on the recent and surprisingly swift final sellout of available inventory of new 800XL units. (The 800XE was never introduced in the U.S.) The 800XE is identical to the common PAL B version of the 65XE, utilizing the same PAL 130XE motherboard with Enhanced Cartridge Interface (ECI). PAL 130XE motherboard (including ECI, but only 64KiB RAM)
  2. You have to choose a "pack size" from the dropdown. 8 feet for US $10.79 12 feet for US $13.95 16 feet for US $16.20 24 feet for US $22.50 Problem is shipping to me in Canada is $13.35, (and US $19.76 to Netherlands) but free within the US....
  3. I found rubber feet that appear match my old genuine ICD PBI/ECI adapter here - I measured them 1/2" height, and has the tapered/rounded corners like this on ebay: https://www.ebay.com/itm/254410391310 - I can't easily find similar on jameco or digikey... but I also might not be searching correctly... I presume the right angle PCB would sit at the same height. Looks like a pair of metal standoffs could work too.
  4. Was it still "somewhat wet" when you powered on the computer? If so it might cause conductivity across traces and cause false readings.... or short +5DC directly to ground...
  5. I was able to revive an XE with non-functional START/SELECT/OPTION by adding some resistors to increase the input voltage to those keys to help the GTIA detect them. (The others are read by POKEY) - not requring replacing the entire mylar. Similar tweaking may help with HELP and RESET. A variable POT will help you determine the thresholds for ON and OFF to help choose appropriate resistors. Here I show the completed mod:
  6. I can relate!!! I was sitting in a high school class with the flash components I had extracted from a disposable film camera... Battery attached to a little PCB with the bulb, a capacitor and a leaf switch to "flash"... did it a few times in class, and the jock in the row behind me threatens violence if I do it again... so as I'm putting it away my finger accidentally touches the contacts on the back side of the PCB.... not just flashing again, but electrocuting my finger and leaving me writing in pain with two burn marks on my finger AS WELL AS the other guy proceeding to pummel me - double whammy LOL
  7. I've had my own non-working 850 sitting open on my desk here for coming up on 2 years now... since the initial troubleshooting sessions I've acquired a working second one to assist with part swapping (to do) and a replacement known good ROM as well (thanks @DavidMil) Hope to get it figured out and put together at some point before I lose the screws and other parts to put it back together!
  8. I've noticed this when I feed the "composite" signal from the computer into the "chroma" input on the 1702, especially on screens that are overall brighter. Ensure you have the actual chroma signal from the 800 connected to the monitor's chroma input.
  9. OK, instead of sys-check dip3 on-on-off, any difference with off-on-off? We see a GTIA 80 hozizontal pixel mode (ie Gr.9) being engaged here - so its possible GTIA is suspect, but im not sure how that could hang the system. Maybe clock buffer (74LS08) since MMU, ANTIC, OS ROM has already been ruled out... maybe CPU.
  10. Any difference if you set the sys-check to supply the base 64K? Also thinking maybe worthwhile to try swapping the 74LS08 buffer with a 74HC08 or 74F08
  11. Do key clicks also similarly fade? (Ie when typing in BASIC) That sound is generated by GTIA not POKEY - if so, suggests not the POKEY or GTIA IC's but something else along the audio/mixing path. If no, then it points to POKEY specifically...
  12. Try connecting up the RF output, and compare audio output from that.
  13. Is Turbo Basic compatible with ROM replacement Floating point routines? I can't recall .. ie mostly using it's own routines, but some calls still made to ROM may be a problem...
  14. See the last post #52 in this thread: - XL rev 3 base OS ROM (Self test can test XE extended memory) - Hias' hispeed patch - includes reversed Option for BASIC and shift-reset for coldstart - Charles Marslett fastchip math pack routines - Self test patched to properly test all XE extended RAM, not just half of it twice - Updated checksums so OS startup and selftest rom checks pass
  15. 48 bids probably from individuals not familiar with AtariAge? There has to be people here who would part with 1200XL's for reasonable prices if only asked. Paul Westphal and bob1200xl come to mind...
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