Jump to content

Papalapa

New Members
  • Content Count

    82
  • Joined

  • Last visited

Community Reputation

46 Excellent

About Papalapa

  • Rank
    Star Raider

Profile Information

  • Gender
    Male
  • Location
    Barcelona, Catalonia

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. The best solution: composite video. I thought it would just be soldering an RCA to the video signal before to enter into the modulator as happens with the ZX-Spectrum but the PHA 2036 that I have is the one with a plastic case, not a metallic one and it has been a little more entertaining. Basically I have installed an adapter circuit and now I already have composite video. Without obviously becoming RGB signal, the change from RF to composite is noticeable. The adpater circuit The "modulator" with audio/video outputs Video signal on TV
  2. I agree, After lots of tests with different monitors and video converters the solution for me has been to use the PHA 2036. Here are the steps: 1) Luminance signal thorugh VGA converter on LCD monitor 2) Components cable on LCD monitor 3) Components to VGA converter on TRC monitor 4) Internal components to RGB converter 5) PHA 2036 on LCD monitor I'm really surprised of the quality image obtained with only the RF modulator, it seems composite video instead. Thank you @Flottmann1 😉 Next step will be to open the PHA2036 and try to get the video signal before the modulator and see what happens. I hope to have a little bit better quality. We will see...
  3. I agree that the problem most probably is located at the floppy disk. If you do not have another one you can download the DOS 3.3 image from Internet archive website for example and send it to the Apple IIe using ADTPro to create a new floppy.
  4. It is very interesting and surprising because it seems that with the Sony TV and the PHA 2036 RF modulator although the picture is not sharp at least you have the right colors on the screen. I also have a 14" 4:3 LCD Sony TV for my retrocomputers collection but I don't have the RF modulator. Even you can get the video composite signal inside the modulador in order to get better picture in the screen. Until now I tried YPbPr to VGA, HDMI and RGB converters unsuccesfully with both, TRC and LCD displays and even connecting the YPbPr TI-99/4A output directly to theSony TV but colors were always incorrect. May be the solution is to find an PHA 2036 RF modulator....
  5. I don't achieved to have a good image with my PAL TI-99/4A. I have no RF modulator but even having one I guess that the image quality will be bad. I tried several TVs/monitors LCD and TRC but the colors on the screen are always wrong and most of times out of sync. Even I installed the Citrus3000 chip to convert the video ouptut to RGB unsuccesfully and actually I'm using the luminance output of the 6-pin DIN but in this case I only get a B/W signal on the monitor of course. It will be great to see your pcitures tomorrow...
  6. Well, finally I have solved the small problem with the graphics. Apparently there are two types of 80-columns card for Apple II, the "cheap" 80-columns that include RAM to double the capacity of video memory, and the "extended" that adds 64K to the memory of the Apple IIe making a total of 128K. In my case I have the "extended" one. After running several checking programs that said that the 64K of the card was fine, I opened the Apple IIe to take a photo of the card, see what chips it had and search for info on the Internet. When taking the photo I realized a jumper marked JP1 that I had not seen before and it seems that when this jumper is not set the "double high resolution" is disabled. This is to make the card compatible with the "Revision A" motherboards. . This revision of the motherboard does not support the necessary bank switching for that video mode, so the jumper has to be removed in order the 80 columns card to work properly, and this is how I had it, without a jumper. In my case I have a motherboard revision "B" so I have only had to put a jumper on JP1 and the graphics of all the games that previously did not look good worked for me. Although they were very few, it was really annoying. Apparently, if the computer was used for administrative functions, perhaps that graphic mode was never needed, and hence no one thought about setting the jumper. I leave you a photo of the jumper with a red circle.
  7. Nice and quick job, congratulations. It's an NTSC or PAL TI-99/4A?. How do you connect the TI-99/4A to the LCD monitor?
  8. This will be great because as you know we, the TI-99/4A users in Europe have to pay high freight costs and customs if we buy in USA. If someone can sell directly in Europe this amount will be dramatically reduced.
  9. Glad to see another Apple IIe coming back to life. If do you not opened before the PSU I advise to check inside. Most probaly there's a capacitor (at least one but most probably two) damaged. See my post if do you want: It seems that these "RIFA" capacitors become damaged after only some years of use. It is a good idea also to check the electrolytic capacitors as well... Congratulations for the refurbishing 👍
  10. Wow, this is not a refurb, it's a miracle!
  11. Thank you for your BASIC program but finally I used some diagnostics software (XPS Diagnostics, Real Software Diagnostics, Master Diagnostics IIe, Computer Inspector and Apple IIe Diagnostics) and all them said that the 80-columns card and memory were correct. I also installed AppleWin emulator and I get the same issues as with my Apple IIe so, maybe there's some compatibility problem with these games. I will try to investigate a little bit more about this...
  12. Well, after half a year with the components in the drawer today I have spent the day in modifying the video output of the VIC-20. Until now I used composite video but it was really bad in my VIC-20 there were even colors that sometimes were not displayed and screens where you could not even read the text. The process is not complicated at all, just replace two components and cut two PCB tracks. Obviously the connection cable to the TV / monitor must also be modified due to the pin change. The components to be replaced are inside the cage where the video signal is generated. They are marked with a red circle in the picture. Two tracks at the bottom must also be cut and a cable soldered. Without the modification, pins 4 and 5 of the DIN connector carry the same signal (composite video), but after the modification pin 4 carries the luminance (Y) and pin 5 the chrominance (C), so the pins of the DIN connector they must be changed and a mini-DIN (S-Video) connector mounted in the other side of the cable to be able to connect to an S-Video input on the TV/monitor. Audio cable remains the same (RCA connector). Once the modification has been made I also replaced all the electrolytic capacitors of the board and set a heatsink to three integrated circuits. The change has been brutal considering the terrible video quality it had before. Before (composite) After (Y/C)
  13. Yes, I was also aware of this but mine is "B" version I think. The "B" letter is shown before the reference 607-0664 instead of after, but I guess that it doesn't matter, it seems to be a "B" motherboard. Originally was an IIe but myself installed the kit to convert to an IIe Enhanced.
  14. I do not see any switch on the 80col card. Where is it? The computer is an Enhanced version, myself replaced the original three ICs and CPU to move from Apple IIe to an Apple IIe Enhanced. Also, I passed some hardware test programs and all of them identified the machine as "Enhanced".
×
×
  • Create New...