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About Jeff_Birt

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  1. This video started out with a simple mission. To investigate the Suncom 4-button controllers used for ‘The Party Quiz Game’. These odd controllers use the paddle inputs, so this set off a quest to learn how the paddle input worked and how to read them. Along the way we wind up characterizing the response curve of the SID’s POT inputs, comparing those to the Armsid, discovering a problem with the Armsid POT inputs on a few of the very first PCBs, fixing that with an experimental firmware update. It was a lot of work, and a lot of time spent collecting data, but it was also a lot of fun. Top finish things off we look at the surprising number of input devices that made use of the POT inputs. Who knew there were so many? Thanks to some folks on this forum for pointing out some of these devices. Join us…
  2. Here is the new list: Input devices that use POT input: · Paddles · The Party Quiz Game 4-button controllers · Atari CX85 keypad (POT Y used as digital input) . Cardco Cardkey Numeric Keypad clone of above · Atari CX80 track ball can use analog (mouse) or joystick (digital) modes · Atari driving controller · Atari Video Touchpad (Atari 2600 for Star Raiders), can use on C64, etc. · Atari Touch Tablet CX77 · C64GS joystick (Cheetah Annihilator) uses POTX as digital input. · Commodore 1351 Mouse · Koala Pad · Mssiah (uses external pots for controls) · Vaisala HAWS weather station · Security dongles · Muppet learning keys, Kids Computer Keyboard · RCFS 64 Commodore 64 Dave Brown R/C Flight Simulator Dual Joystick · Suncom Animation Station
  3. Since the C64, Atari and Apple were made to accept very different paddle resistance ranges (470K, 1meg, 150K respectively) I suspect Koala Pad was configured to work with each device to get the maximum resolution.
  4. I just learned from someone on Facebook that the Atari CX80 track ball can use analog (mouse) or joystick (digital) modes. The Muppet keyboard in a new one though. I wonder if it was released for other systems as well?
  5. Quiz - What input devices used the paddle, i.e. POT inputs on the Atari or C64? Below is a list I have compiled with help from folks on Twitter. This question came to mind after I spent a lot of time to characterize the input_resistance/byte_value curve of the A2D converter on the C64 SID (which is nonlinear, spoiler alert, and I suspect the POKEY POT inputs are equally nonlinear). The exact response curve does not matter for paddles or mice as you are moving them in proportion to what you see on the screen. For a security dongle or the 'The Party Quiz Game' controllers it might make more a difference as they expect a certain resistance to result in a narrow range of readings from the SID. Input devices that use POT input: • Paddles • The Party Quiz Game 4-button controllers • Atari CX85 keypad (POT Y used as digital input) o Cardco Cardkey Numeric Keypad clone of above • Atari Video Touchpad (Atari 2600 for Star Raiders), can use on C64, etc. • Commodore 1351 Mouse • Koala Pad • Mssiah (uses external pots for controls) • Vaisala HAWS weather station • Security dongles
  6. Thank you! Somehow I completely missed the ICD clearly written on the chip. If it had been a snake, I would be a gonner
  7. Thanks, but is 'this' Rockwell chip actually 'the' US Doubler ROM? (I know the top chip in the first picture is an 'A' version Atari ROM.)
  8. I bought a bunch of Atari goodies recently and in one box there was an old pill bottle labeled 'ROM B'. Inside were three ICs, one of which was actually a 'ROM A' not a B rev. The other two puzzled me for a bit until a friend on Twitter mentioned SpartaDOS. After finding the post below I was sure that the encapsulated module was the SRAM and guessed that the Rockwell chip was a ROM but I am unsure of if this is the original Atari 1050 ROM or the 'US Doubler' ROM. Searching based on the part number turned up nothing other than one other post wondering what the chip was too (although he did read it out so it is a ROM). I will try to read the ROM but as hoping someone might be able to identify it by the part number so I know what to try and compare the ROM dump to. Thanks!
  9. In this video we cover the design and construction of the third revision of my SVideo cable for the C64. The Mk1 version was usable but had shortcomings. The Mk2 version was done in a hurray to overcome the annoying whine of the SIDs audio input picking up noise. Though it was supposed to be a temporary solution it lasted a few years. The Mk3 cable was made with mostly things I had on hand and using the proper type of shielded cables. Join in as we see how it was made and how it works. https://youtu.be/cIWfHeiMaCo
  10. WOW! Thanks. I will give this a try in the near future and let you know how it works.
  11. Hi. Thanks for your help. Yes, that is the image. I have no issues with converting a 5.25" format to 3.5" and I can write an image to a disk with my SuperCard Pro. While you can boot the machine with a plain vanilla DOS 3.2 disk it will not function 100% correctly. Both the 2000 and 2000+ have special system files on the boot disk that handle things like the 'blue button' on the keyboard and 'decolorizing' the display so it looks better on the greyscale LCD. It is unclear if these files are the same for the 2000 and 2000+.
  12. I recently acquired a Kaypro 2000+ laptop. Well, if you can call a #17 (7.25kg) portable DOS computer a laptop. The original Kaypro 2000 had a small, 80x25 screen. A few years later they came out with the Kaypro 2000+ which has a larger screen and was also sold in France under the Goupil brand as the Club. Neither Kaypro 2000 model sold well. The original 2000 model came with DOS 2.1 modified to support 720K 3.5" floppies and there were some other 2000 specific system files on the original boot disk as well. There is an image of the original set of three 720K 3.5" disks available online. The 2000+ came with DOS 3.2 with some Kaypro specific files on the disk. This original boot disk seems to be unobtanium now. The closest I have been able to come is the Kaypro DOS 3.2 OEM release on 5.25" floppy and the original 2000 DOS 2.1disk image. Perhaps by knowing what was changed on the DOS 2.1 disks from a plain vanilla MS DOS 2.1 (same with DOS 3.2) the 2000+ boot disk can be recreated? If you know of anyone that might have the Kaypro 2000+ DOS 3.2 boot disk I would very much appreciate the lead.
  13. As a kid I had a generic C64 fast load cart called 'Jet Load' which was an Epyx FastLoad with some sort of hackery done to it. Not a straight copy but rather mildly manipulated. They were sold at Hamfests in the Midwest of the United States. I found a V2 on eBay and it seems all posted ROM images are of V2. If anyone has Jet Load' V1 or ROM image I would sure be interested. There is a ZIP file floating around from 'rr.c64.org' which has dumps of several fast load ROMs but the Jet Load it has is V2 (confirmed by comparing to the V2 cart I found on eBay.) The one I had as a kid was a V1 and I would love to get a dump of the ROM to compare the two. I suspect Jet Load V1 is a manipulated Fast Load V1. Jet Load V1 did not work with a lot of disk, many of my original disks have 'No Jet Load' written on them
  14. Hello everyone, We have received the first production samples of the new DB23 hoods. The matte black color looks great and the hood fits nicely on the new connectors as well. Not being a fan on the tiny screws used on DSub connectors I am very happy to report that the thumbscrews are easy to use, the knurling makes them easy to turn but they are not so large as to get in the way. We should have the first full production batch about the end of March. There is still time to preorder, see the first post in this thread for details.
  15. Hello all, we still have these spiffy new DB23F connectors available and new matching hoods will soon be available as well.
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