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Rybags

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Rybags last won the day on September 1 2016

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About Rybags

  • Birthday 10/01/1967

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  1. There can be issues when the browser might try to open the file instead of offering to save it. In Firefox at least you can change the action in settings (ask, save, open in Firefox, use default Windows application etc)
  2. It would have to be patched in from the incoming line from the normal cart port I'd think. The cartridge decides whether this signal is active or not (usually hardwired) - the computer only uses that signal as part of memory select logic.
  3. Just cycles through some noise/poly sound with same frequencies and rising volume on each. But to get it to work you'd need the registers defined. Also the RETURN generates an error, so replace with END 10 AUDC1=53761:AUDC2=53763:AUDC3=53765:AUDC4=53767:AUDF1=53760:AUDF2=53762:AUDF3=53764:AUDF4=53766
  4. "Side facing TV" is confusing if using a machine with flat mount - 1200XL, most XE.
  5. The IDE +2 does it's own address decoding. Then Extsel can be used to tell the computer to ignore it's own internal memory for a particular access then the PBI device supplies the data (or in such a case, pass it thru from a mounted cart) At least that's the way I would see it - PBI doesn't receive or provide those special cartridge sense/control lines so has to replicate the functionality within itself.
  6. Fairly sure you can run (at address) it again without loss (I used to have to do that a long time ago) $90A1
  7. My thought is that games would benefit more from a coldstart providing it also has easy mechanism to restart a game from within. Exceptions there of course for the likes of 7 Cities, Alternate Reality and other complex ones. For applications and programming languages you usually want to preserve what you have in memory.
  8. Fairly sure this has been discussed previously - my theory is also the misprint one. I have a Star Raider - how common though I don't know as I only became aware of the existence of this misprint probably 10 years or less ago.
  9. It does go against the grain a bit. On 2600 Reset starts a game. But with computing in general, Reset will generally mean at the least a warmstart. In the modern day it's sometimes desirable anyway to get a coldstart - the XL OS has the magic numbers which some software overwrote which would force a codestart when you press Reset, so it can sometimes just be inadvertantly using memory which was originally spare but later allocated.
  10. To get a decent picture on a monitor you'd be looking at modifications which would also mean putting holes in the shielding and case. Sophia 2 is probably the cheapest/easiest solution but I don't know about availability. For practical purposes I'd go for an XL or XE. Easier to work on and modifications can usually be done less obtrusively. In the modern day demand is probably higher for PAL machines since many games and demos won't work on NTSC due to less CPU cycles per frame.
  11. Build quality went down with XE in general so don't be surprised to see faulty solder joints. If you can't DIY then you could inspect, looking for severed traces and capacitors leaking or bulging. XEGS allows seperate audio out so you could attach to something that can play it and see if the computer is actually starting - attach a keyboard before power up and see if you can get keyclick - hold Start on powerup and see if you get the audio prompt.
  12. How about PokeyMax? https://atari8.co.uk/firmware/pokeymax/ Although you could call it a bit of overkill - stereo, SID and Covox also included. But, if there's space to spare then why not?
  13. Additional - you can change GTIA mode midline, some demos do this. You can go from hires to any GTIA mode then back again, it requires cycle exact timing. But once back to hires you actually get a 160 mode where the palette mapping of pixels is different.
  14. You can't redirect memory fetches midline. Garbage might be because the memory fetch has crossed a 4K boundary. That's one thing to look for, memory fetch for screen will wrap around at 4K boundaries, ie go from $3FFF to $3000. A LMS instruction is needed with a mode line to get over the 4K boundary. Another thing is hires modes on tall displays - you can get display distortion due to a hardware bug if the 240th line is hires. This can be overcome in software but a fair effort is needed. The display list itself can't cross a 1K boundary. A jump instruction can be used but it leaves a blank line which is usually undesirable.
  15. USB analog capture devices can be gotten for a few bucks on eBay, so you could record the real deal at reasonble quality.
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