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About mutterminder

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    Chopper Commander

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  1. Since I just noticed this thread, I guess I'm a little late to the party. So I'm kind of glad that the game never shipped on the original schedule. Now, if it actually does get released, maybe I'll get a chance to buy one.
  2. I know him very well. I've sent you a PM.
  3. If I install another one of these, I may try that location. The issue was that I don't have as much time for this sort of thing as I might like, so I was looking for quick "do it like this" instructions. Lotharek's website gives enough information to figure out where to make the connections, but there are no clear pictures of a 600XL. Nor could I find any on the Atari Age forums. I'm not saying there aren't any here, just that I couldn't find them. All the things considered, the U1MB upgrade is pretty painless relative to some other mods. This most time consuming one that I have ever done on a 600XL is the Super Video 2.1 mod. I was pretty happy with the results, but with UAV now available, I doubt that I will undertake another Super Video 2.1 mod.
  4. I tried to find a good picture of some good connection points for my U1MB and I was unable to locate them anywhere. Eventually I gave up and just decided to figure it out for myself. As a public service to anyone in the future who is seeking the same information, I am posting here pictures of my installation. I found some good vias on the motherboard to make the required connections for the U1MB. As a reminder to anyone undertaking this mod, the 600XL must first be upgraded to 64K. The first picture shows all of the connection points on the PCB including the required modifications for 64K. (The 64K mod is the blue bus wire.) The second picture also show the connections on the U1MB in case your wires are not the same color.
  5. I wouldn't mind having one of those CSS Black boxes with a Floppy Board, but I'm not sure if they are even available any more. Also, though I enjoy using legacy media, like tapes and floppy disks, the amount of space taken by the media and the hardware required to read it, makes it increasingly less likely that I would really get the full benefit of such a device. I would likely just use it for copying disk images for archival preservation. Probably the only thing keeping me using my Atari 8-Bits is the availability of the various flash storage interface devices that are now on the market.
  6. Good find on that PDF, I'll see if that helps me. Although the floppy disk drive jumpers depicted on page 44, don't seem to match the ones on my drive, which you can see at the beginning of this thread. Otherwise the LS120 looks like a good solution. The company may allow me to purchase a used one as long as it doesn't ship from China.
  7. This is a very interesting discussion, for those of use who have lived through the evolution floppy disk storage as I have. The difference between "single", "double", "enhanced", "quad", "high", "extended", etc density, was initially used to denote the bit storage density relative to some initial value for a given disk size and track spacing. For instance, my first floppy disk drive was a 5.25"", 35 track single sided drive that stored 80k. One could have used a 40 track drive that stored 90K, but it was the same density in that it stored the same amount of bits per track and the same number of tracks per inch, it just used more of the inner portion of the disk. Of course the actual physical bit density was higher in the inner tracks but the bit rate of 125Kbs was constant across the tracks. When I upgraded to a double density disk controller, the recorded bit rate per track was doubled to 250Kbs so the disks had "double" the bit density per track. If we keep all other parameters the same, and double the bit rate again, one would have a "quad" density disk. From this perspective "single", "double", and "quad" all refer to the number of bits per track. However even drive manufactures couldn't seem to agree on common terminology. If you double the amount of tracks per inch for a given disk size, this too doubles the data density in terms of the number of bits per square inch. So you could, I guess refer to 125Kbs bit rate, 80 track disk as double density. But for me, I always associate density with bit rate. It's all relative. The tricky part becomes, "What is it relative to?"
  8. Well actually I do have and ATR8000 as well. I suspect that it might be good as it looks to be in pretty good shape, but it is more than 30 years old so you never know. I was just curious if anybody knows if these were commonly used with the Ohio Scientific? Since some of their computers were actually using 8" drives, I guess it's not too outrageous to think they could have used this drive. I wonder if I could use it with a CoCo?....
  9. I know that the Colecovision supply outputs DC voltages, however it does have a transformer, and therefore there are internal AC voltages. I was hoping that I could rewire the output of the transformer directly to the output of the power supply. Based on the current rating of the DC voltages, the transformer probably isn't beefy enough, but I thought it was worth looking into. I would gladly use those floppy disk supplies you mentioned, however I don't have one, and they don't seem to be commonly available. Does anybody have a schematic of the Colecovision power supply?
  10. Actually I've found that even Windows 10 will work with pretty much any format. I have been able to get my 2.88Mb ED Floppy disks to work by formatting them at the command line. If you specify the number of tracks and sectors it works. For instance Format A: /T:80 /N:36. Once it's formatted at the command line, one can read and write to it from Windows.
  11. If we are going to open up the possibility of internal modifications to the SV-328, this would give us plenty more options. I was just considering plug and play options for a stock SV-328. Even though the TI-99/4A power brick has both 18VAC and 8.5VAC which is close enough to what we need, there are only 3 conductors in the plug so we can't really use it. Plus the 8.5VAC probably can't deliver enough current for the 5V regulator in the SV-328. I'd like to investigate whether the Colecovison power supply could be modified for the purpose, but I can't seem to find a schematic of it.
  12. I just found my SV-328 in a box in the garage after 20 years, but I haven't yet found the power supply. All of this information in this thread is very good, but I've been having a look at the schematics of the SV-328 and it looks like you don't necessarily need two AC voltages. The 8VAC feeds into a full wave bridge rectifier and then into a 7805 regulator, this means that circuit should work with any 1.5 Amp supply either AC or DC between 7-10V. The 16VAC feeds into two half-wave rectifiers, one for +12V, the other for -12V so you still need an AC signal. I should have a spare TI transformer around, it looks like you might be able to rewire it to work with the Spectravideo. I'll have to experiment a bit when I get the chance.
  13. Thanks, for the reply. If you look in the picture, the drive is a TEAC FD-235HF according to TEAC's documentation this is an HD drive. It does have the density switch installed. I'm starting to believe it's an issue with Windows 10. I haven't really had a chance to try this setup in an older PC with Win XP or earlier, of course those older PCs tend to have floppy disk drive controllers so I wouldn't have to try this workaround. The LS-120 route might be worth pursuing if it can be made to work in Win 10. The only problem with that option is my company will not allow purchases from ebay.
  14. I found an Ohio Scientific disk drive with a Model of C1PMF in my garage that I forgot I even had. I can't seem to find anything about it on the internet. I don't believe the I have the C1P computer itself, (I think I would have remembered that.) so I have no way to test if it is still functional. I did clean it up and I opened it up to see what is inside. It has just the floppy disk drive and a power supply. I tested the power supply and found that the 5V and 12V are still good. I thought for sure the drive would have a bad drive belt but it seems to have a direct drive motor. It is a double sided 5 1/4 inch, half height drive. I was able to find some information on the drive itself, which is a Mitsubishi M4853. It's a little unusual as it is double sided, double density, but it has 80 tracks. There are only 16 sectors per track so total formatted capacity is 640K. Does anybody know if these were standard drives for the Challenger C1P?
  15. I'm excited that I'm finally getting close to getting my Phoenix. I was one of the backers on Kickstarter last year, and when you fell back to plan B, I was one of the first people to put in my order on the Collectorvision web site. I believe that the Phoenix is truly a labor of love. I'm happy to see that you guys have the intestinal fortitude to complete this project despite the risks. We're talking a very niche market here, but you had a dream and you were able to pull it off. My hat is off to you! I think it's great that you are basing the Phoenix on existing open source cores, and that it remains an open source platform. The ZX Spectrum, MSX, and other Z80 cores should be relatively easy to port because of this. With the expansion module port, the Phoenix has the potential to support I/O and cartridge slots for most of the 8-bit platforms, though there doesn't seem to be enough pins for direct connection to most carts. There are ways around this at higher data transfer rates, but it's going to increase the complexity of your cartridge adapter. Anyway I'm sure this has already previously been discussed in great detail. Still the possibilities are exciting, and I'm glad see it come to fruition. I hope to see you guys at PRGE next week.
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