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About ACML

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  1. If you're going to use the hole in the RF modulator, does that mean you are planning on removing it? If so, why not just use the RF hole (make it bigger) for the monitor jack and keep the channel selector as the OS selector? Once the RF modulator is removed, it would seem to be ideal space to put the monitor jack?
  2. I did not know that. You learn something new every day. Also, in my initial response, I was referring to Omniview XL. I guess Omniview 80 is an earlier version??
  3. The Omniview 80 OS is a great OS, but keep both (Omniview80 and 600/800XL OS). It's an easy upgrade. First question: Do you plan to use the RF out video Channel 3-4 for video output? If yes, then what I'm suggesting might not be something you'd want to tackle. If not, read on. The stock 600/800XL OS is a 16K 28 pin ROM. 1) Get yourself a 27256 28 pin EPROM (32K). 2) Write the stock 600/800XL OS on the 27256 at address 0000 to 3FFF (first 16K). 3) Then write the Omniview 80 OS to the same EPROM at address 4000 to 7FFF (second 16K). 4) Gently bend up pin 27 of the EPROM and insert the EPROM in the OS socket so as pin 27 is not in the socket. 5) Solder a wire from pin 27 of the EPROM and solder the other end to the center post of the channel 3-4 switch. The RF Channel 3-4 switch is already conveniently (+5VDC / Center post / GND). The RF switch is now repurposed as your OS selector. When switch is +5VDC, you get the upper 16K (4000 to 7FFF) or Omniview OS. When switch is GND, you get the lower 16K (0000 to 3FFF) or 600/800XL OS. CAUTION: Always remember to have the machine powered off when you switch OS. The reason for the question regarding the use of the RF modulated output is that depending on which OS you want, you will have to switch between channels 3 or 4. It's functionality still works. Comments about the Omniview 80 OS. 1) It's based on the 400/800 OSb OS and is 99.9% compatible with older OSb software. 2) Even though its basis is from the 400/800 OSb, it does allow use of the full 64K for Ram. NICE! 3) It has the fast math floating point routine. Basic programs with floating point run much faster. 4) It has the ATR-8000 monitor function. 5) It does not have the 1200XL extended keyboard and LED L1 & L2 functionality, nor the PBI code. The 80 columns works in BASIC, Editor Assembler. Its does not work for Microsoft Basic in that output still wraps at 40 columns. Hope this helps! P.S. This will also work on a 800XL.
  4. Did you use a manual spring plunger type solder sucker? I ask as I had a similar issue that turned out to be a super thin solder flake from my solder sucker lodged underneath the POKEY socket. Caused the machine to loss ability to read anything off the SIO. Troubleshot for days, very frustrating! In desperation, I blew compressed air all over the board and it un-lodged the solder flake. Back to working 100%. Just a thought if you've tried everything else.
  5. I started with an SIO2USB, then found the SDRIVE, followed by SIO2SD and recently acquired a Fujinet. I have to say my favorite is the SIO2SD. The Fujinet has the potential to leap ahead, but the disk/file loading interface has to be improved. The main gripe I have with the Fujinet is once you get into the second or third subdirectory, you can't see the actual filename as its truncated. The SIO2SD is superior to me for drive setup and ease of use. A big plus is the ability to manually change the ATR using the LCD even after the machine has booted. I really like seeing the whole filename with minimal truncation since it only displays the filename without the path. It's super reliable and plays well with other hardware. Fix the Fujinet interface and I'll rethink it.
  6. Saw this one on eBay today. Who uses a sharpie to deface a piece of hardware? I'd be pretty upset if when I picked up my car at the service department that some genius writes "oil changed, brakes look good, but needed to add coolant" in sharpie on my hood. Who does this? Really? Two words buddy, "Post-it Notes"! Learn it, live it, love it.
  7. Does the red light come back on or is it now out completely? If it won't light up anymore, did you smell any hot plastic like smell or see any smoke? If it does not light up anymore and no visual smoke, do you have a way to test the 9VAC power brick? 400s have been know to have a bad power board and it blows the 5 amp glass fuse in the 9VAC power brick. If that's the case, don't try another power brick or you will just blow the fuse in that one too. If it is the 400's power board, just swap out the whole power board as they are like $15.
  8. Maybe this explains why I always go to K-razy Shootout instead of Berserk. K-razy Shootout is fast and smooth with great audio.
  9. I've always found that the best way (cheapest) to acquire the five VLSI chips (POKEY, ANTIC, SALLY, GTIA and PIA) is to buy a cheap complete machine or a populated motherboard. I recently saw some fully populated 800 cores go for <$50. Considering you get a POKEY, that's a pretty got deal. Also, don't overlook a cheap 5200 on eBay. You get a POKEY, SALLY, ANTIC and GTIA, but no PIA. Those 5200s can sometimes be found at very reasonable prices.
  10. Best Electronics has an order limit of 1 POKEY, but is that a lifetime limit (only one per address) or is it only one per order?
  11. A bad OS ROM can cause a green screen. The 400 OS ROMs are on the mainboard. You say you have a 800? If it was a bad ROM, just a very sketchy guess right now, you could swap the OS ROMs from the 800 into the 400 and see if it boots. I'd troubleshoot more obvious potential issues before I tried this. I once had a 400 with the green screen issue and it turned out to be a bad ROM.
  12. If you want an Atari OEM replacement part, order part number C061022. Best Electronics has them.
  13. Haven't played a lot lately, but back in the day and in no particular order: Star Raiders Choplifter Joust Pacman K-razy Shootout Rescue on Fractalus Defender Galaxian Baseball (Gamestar)
  14. Bob, I tried the 15uF instead of the 22uF to replace the original 47uF and it worked great. I used a 15uF 35v axial alum electrolytic. I know what you're saying about the Defender bug, but try this out. When I replaced C7 from 47uF to 15uF, the Defender crashing on demo bug seems to have been cured as well. With the original 47uF at C7, I could never get the Defender demo not to crash before 700,000 points. With the 15uF at C7, not only did it reduce the delay time on reset, I got the Defender demo to 1.4 million twice and it was still trucking. No more lock ups. Maybe today's two extended runs were just that, two good runs, but I could never achieve this before on this board let alone twice in a row. Go figure. P.S. The Defender demo crash only happens when you are using the cartridge version. Loading a CAR or XEX won't have an issue. Must be hardware related to cartridge port.
  15. I replaced the C7 (47uF axial) capacitor with a 15uF axial like Bob suggested in the hope of reducing the "one Mississippi" delay on reset when you swap the 74LS14 with a 74AC14. It worked great! The delay is imperceptible to the original 1200XL reset behavior. The delay went from 1 second (C7=47uF) to 1/4 second (C7=15uF) with a 74AC14 installed. The program in BASIC reliably stays in memory after RESET like it should. Thanks again Bob!
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