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flashjazzcat

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flashjazzcat last won the day on August 14 2019

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About flashjazzcat

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  • Birthday 12/19/1972

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    Playing jazz guitar, music, reading, writing, PCs and anything to do with computers, movies

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  1. SysCheck's primary purpose is not as an aesthetically pleasing, discreet RAM upgrade. While it can serve as a RAM upgrade and external OS ROM, its primary function is as a diagnostic tool, and it completes that mission objective with aplomb. 'Poor quality control' and 'SysCheck' are not two entities which sit well in the same sentence. I'm sure requests for a smaller PCB, some form-factor change, or a casing would be well-received, but the analogy with the video game crash does not hit the target well, IMO.
  2. This usually happens stuck or undriven keyboard register, since the internal code for 'L' is permanently present. If stereo was not detected in the first place, there would be no stereo setting to change (the option would be greyed out). The method used in the currently available firmware is the one you described on the forums some years ago; specifically, it sets up a timer interrupt on the primary chip and checks to see if the IRQ appears on the secondary POKEY's address space (which it will if there is no stereo board present). In the soon to be released update, that method is dropped in favour of KMK's method which puts the potential second POKEY into a reset state and checks to see if the primary chip is halted. Despite the fact your method appears to work with 100 per cent of existing boards, the detection method was changed to accommodate Candle's latest Simple Stereo board, which apparently does not work with your detection method, for reasons which were never clearly explained. The only thing that changes when you turn stereo on or off is a single bit which allows the secondary POKEY to appear at $D21x. One scenario in which the keyboard can become unresponsive is if you run the 1088XEL/XLD U1MB firmware on an emulated machine (in Altirra) without stereo POKEY emulated. This is an impossible condition on real hardware (even if the second POKEY chip is removed), however. The test used in the standard XL/XE U1MB firmware is not known to have any adverse side-effects regarding the keyboard.
  3. The VGA core just needed a different crystal.
  4. There are several core slots and you can use the supplied 'FC.COM' core flasher to select the boot core (from a pre-installed selection of several cores, including the GTIA core and versions with and without 320K RAM upgrade emulation) or flash other cores to the slots. The VGA core is completely deprecated; not sure of the status of the audio core. The latest FX core (without PORTB RAM upgrade emulation) is active on a newly purchased board, but you need simply download FC.COM to activate whichever core you want. The problem appears to be that all cores share the same palette (assuming the palette is even integral to each individual core package, which I do not know).
  5. The 800XL instructions do appear to have the wiring for composite and luma swapped at the motherboard end.
  6. Schematics here: http://www.jsobola.atari8.info/dereatari/schematy.htm
  7. Not at all, although I played with a version which supported XEP-80 some years ago.
  8. Unfortunately you can't see the silkscreen if the terminal block is already soldered in. I think I installed three or four of the things and - as explained in the video - I keep googling the same AA thread (in the absence of a landing page with a manual) for a quick reminder of the pinout. Not sure if the person who fitted the board featured in the video did the same thing, but it's fairly easy to get mixed up when working from a photo. That's two boards with exact the same installation error in the same week.
  9. You have composite and luma (the two brown wires) mixed up, exactly as per my last video. Probably for the same reason as well.
  10. About twenty-five minutes into this video, I go through the whole reprogramming process:
  11. Can I recommend Peter Dell's 'Programming the Atari XL/XE' videos: https://www.youtube.com/user/jacofwudsn/videos I can't say I have watched them all but if they are up to his usual standards, they will be an excellent resource.
  12. There are two obstacles there, and one of them is the amount of code required to run an APT implementation. It's not really an ideal case for a custom OS ROM.
  13. I suppose anything which hooks up an IDE controller to the bus is doing essentially the same thing. What makes each implementation different is a) reliability, and b) software. I personally don't care how simple or sophisticated the hardware is, as long as it works and isn't let down by the software. When I look back to 2009 and compare things with today; how spoiled we are by sophisticated PBI hard disks and (almost) universal support for a standardised partitioning scheme.
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