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Papalapa

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About Papalapa

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    Barcelona, Catalonia

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  1. Most probably do you refer to the machine you've seen on the right side of the picture it isn't? If so, it's a Casio FX-9000P, the first personal "computer" made by Casio: Here's the history if this machine if do you want more information...
  2. Here's mine. The keyboard in front belongs to the iMac G4 (not in picture). My Apple IIe has the wDrive connected as you can see. It works like a charm, in fact I don't use floppies anymore...
  3. Hi, I plan to use a miniDIN connector instead of the original TI-99/4A's DIN one, that is, to solder the TMS-RGB pads directly to the miniDIN connector. In this case, do I still needing to add the 3x560 Ohms resitors? If so, where?
  4. Many thanks for the information but my TI 99/4A is already european version so, I guess that no resistors modification will be necessary to install the mod. Anyway, I'll try this way.
  5. Hi, I own an TI-99/4A european version (with TMS9928) and after installing the citrus3000 mod I get the same picture than you (B&W). Did you finally succedd with TMS-RGB?
  6. Just a question: How do you know that the keyboard is "Chicken Lips" type? By the Commodore symbol key maybe?
  7. Sorry to don't upgrade the thread. After almost one year using the wDrive I'm really happy with it. It's very convenient to have the files menu in the Apple IIe screen instead to have to use the small buttons and display on the wDrive. It's also easy to copy and duplicate images to floppy disk (I have a second physical 5,25" drive). Finally it has a high .WOZ file compatibility, even those that use more than only one disk.
  8. Are you from the USA or Europe maybe?
  9. Actually storage problem is solved by using this gadget (from the same guy sells the MiniPET): https://www.thefuturewas8bit.com/sd2pet.html CBM-8032 was the first computer I used at the school when I was young and I still hope to get one one day. The double disk drive was really monstrous, it was almost the size of the CPU...
  10. Well, I'm lucky today, mi Acorn Electron is already working 👍 Today the paint on the ULA was dry and and as you can see in the picture below looks not so good but anyway I installed the ULA in its socket. Before to do this I checked all the ULA tracks and as the last time that were checked all of them seemeed to be OK. Unfortunatelly when I turned on the Acorn I got the same screen pattern and it become frozen so, the malfunction still there. As "Plan B" was to replace the RAM I unsoldered the chips and soldered a good-quality sockets instead. Then I connected the new RAM chips and when I turned on the Acorn I heard a beep and I have seen the welcome screen on the display. I ran some small basic programs and all of them worked without hangs or erratic software behaviours so, the problem was located in the RAM chips (maybe only one chip, I don't know..). At this point I realized how easy it would have been to start by the RAM instead of the ULA and it's socket. What I noted is that the RF output has bettter quality than composite video output ¿? You can see in the pictures below that when the composite output is used a "ghost shadow" is shown over some characters while the RF output is clean. Anyway I will make a RGB cable and I hope that the image quality will be better. Composite output RF output Next step will be to completely dissasembly and clean the keyboard cap by cap (I do this will all my bought retro-computers), and the cabinet. There also some keys that most probably will need "contact cleaner" because they need a strong pressing to be detected. And finally I will upgrade my TZXduino firm to be able to load the Acorn Electron programs (actually it only supports ZX-81, ZX-Spectrum and Amstrad CPC-464)
  11. Well, after receive and carefully solder the new ULA socket the problem remains. As you can see the pattern on the monitor has changed but the CAPS light is not working and there's no "beep" during startup. I tried to clean the ULA pins with alcohol again and one track has gone and now I'm trying to restore this track using conductive paint. Also, some other tracks are small portions gone and other ones seem to have a bubble below the track so at the contact point with the socket, maybe they do not offer a good contact. You can see the pictures: Anyway, after the ULA repair I'll test again all the tracks continuity between the chip and the tracks edge. If all is correct I'll go ahead with the RAM chips replacement as planned...
  12. Thank you for your response. At the moment I released the ULA from its socket and carefully cleaned its pins. While cleaning the pins on the socket I have seen that there are some of them lower than the other so, probably they do not correctly conatct the pins of the ULA. When I tried to straigh a pin it was broken and I "repaired" it using a bit of cable, but later a second one was broken an therefore I ordered a new socket and actually I'm waiting that it arrives in order to replace the damaged one.
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