Started by SilverGreen93, 13:05, 19 September 17
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Quote from: SilverGreen93 on 09:22, 24 November 17Just for curiosity, what's wrong with zaxon's devices? I will be making a full list of Bill-of-Materials after the successful prototype testing and, after such demands, I plan to offer them in 3 variants: board only, board + parts for DIY, or already assembled & tested.Please let me know which of them are you interested in and I will be calculating the final cost afterwards.
Quote from: khaz on 03:30, 26 November 17You can format with Parados.|drivehttp://www.cpcwiki.eu/imgs/0/0d/Parados.pdf
Quote from: SilverGreen93 on 11:43, 26 November 17Thanks a lot! That seems to have done the trick.So, initial testing looks very promising Edit: In the second picture, why is ParaDOS showing 4 times on the start screen?
Quote from: SilverGreen93 on 18:17, 26 November 17I tested CP/M also, but I have one problem. It seems that after loading any CP/M program, when returning to CP/M, the error "read fail" occurs and I can never recover.If I shut off the Amstrad and turn back on, then I can again enter CP/M using the |CPM command. If I return to AMSDOS it works, but if I want to go back to CP/M, it doesn't load, again with the error "read fail".Something weird is going on. The disk reads fine the first time, but the second time it tried to access it, it gives the read fail error.Any clues? I don't know if it's something wrong with the components I used or the floppy drive itself is partially bad.Also, If I CAT the CP/M system disk it works, if I change the disk to standart BASIC one, CAT still works, but if I return to CAT the CP/M disk it again says read fail. This is very weird.Later edit: If I disconnect the power cable from the floppy and connect it back when pressing Retry it works fine, it reads it again.
Quote from: arnoldemu on 18:54, 26 November 17How are you decoding the ROM index which selects ParaDOS? Are you comparing against all 8 bits?
Quote from: arnoldemu on 18:55, 26 November 17I think it'll be doing seeks and recalibrates and read ids to determine the disc format.Then when it determines the disc format, it then does a read data.Does that help?
Quote from: Duke on 22:43, 26 November 17Since Parados is initialized 4 times, some bit is not decoded correctly.That would be either databit 1 or 2, when doing a rom select, since the 464 only initializes roms 0-7 and basic isn't overwritten (bit 0). I did not study the schematic.
Quote from: SilverGreen93 on 22:55, 26 November 17This is strange because the AMSDOS is initialized only once.Anyway, the problem seems to have been fixed after replacing the 74LS136 with a 7486 chip.
Quote from: SilverGreen93 on 22:55, 26 November 17Anyway, the problem seems to have been fixed after replacing the 74LS136 with a 7486 chip.
Quote from: IanS on 01:54, 27 November 17Not a good idea, the 136 is used specifically because it has open-collector outputs, and the 3 outputs used by the rom number decode are tied together. With an 7486 the outputs will be fighting each other.
Quote from: SilverGreen93 on 12:26, 22 December 17All the testing is completed. It works great. Unfortunately I don't have all the necessary parts yet to make more. I have only 2 complete boards for now.I plan to ship the first board in January to the first person that sent me a message.The price will be around 45EUR + shipping. Standard shipping should be around 12EUR to any country in the EU. I will need to quote the final price afterwards.Due to the fact that not all the parts I found are from the same manufacturer or era, I want to test them before shipping to make sure you don't get a faulty one, so I might ditch the DIY part and sell only fully assembled and tested ones.If this is ok with you all guys, I will keep you posted about the progress.P.S.: I can also sell them without the D765 and FDC9229BT if anyone wants them like that or already has those parts, because those are the parts I am mostly short of right now.
Quote from: Querubin on 10:21, 23 December 17Congratulations!.No problem if you assemble it.One question for all. Colud be used an expansion cable for this?. How long it could be?
Quote from: Querubin on 11:40, 26 December 17Merry Christmas. Great! Hope have mine soon.
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