Comments on: Very Complex Floppy Disk Controller Board Finally Fixed After A Long Time Of Investigation! https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Wed, 18 May 2022 18:53:55 +0000 hourly 1 https://wordpress.org/?v=5.4.21 By: Albert van Bemmelen https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388534 Wed, 18 May 2022 18:53:55 +0000 https://jestineyong.com/?p=27475#comment-388534 Note2: Later on Commodore apparently used a Sony CX20185 chip in its newer Commodore Floppydrive units. Some sellers sell this chip as being a dolby audio chip which could be wrong if it is originally in fact a Floppydrive head amplifier.

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]]> By: Albert van Bemmelen https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388533 Wed, 18 May 2022 18:46:11 +0000 https://jestineyong.com/?p=27475#comment-388533 Note: Apparently the very mysterious U7 Hybrid module in Commodore's 1571 Floppydrive was maybe also used in Akai VCR videorecorders? Which is unexpected and also not confirmed. As said documentation on this 30 pins module is so good as non-existing and also Akai and/or the chip manufacturer do not have any information about this hybrid chip sadly. Anyway... here is a link that shows the Akai hardware connection:
https://www.hqelektronika.hu/hu/vcr-hybrid-ic-akai--30p-h36a2u57

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]]> By: Parasuraman S https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388508 Wed, 18 May 2022 03:58:12 +0000 https://jestineyong.com/?p=27475#comment-388508 In reply to Albert van Bemmelen.

Many thanks!

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]]> By: Albert van Bemmelen https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388378 Mon, 16 May 2022 13:27:38 +0000 https://jestineyong.com/?p=27475#comment-388378 In reply to Waleed Rishmawi.

Addendum: In case anyone also needs to make and program a new Eprom U2 rom for his FDC 1571 he probably is advised to use the version 05 bin file because the ROM and Eprom version 03 I used is still known for having a small bug. A problem that was solved in U2 ROM version 05. Here is the link to that file:
http://www.zimmers.net/anonftp/pub/cbm/firmware/drives/new/1571/1571-rom.310654-05.bin

It corrects the bug of 310654-03 that moves the R/W head between each sector when writing on the disk's top side.

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]]> By: Waleed Rishmawi https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388370 Mon, 16 May 2022 05:39:41 +0000 https://jestineyong.com/?p=27475#comment-388370 not my area of experience but surely it was a lot of information to take in. thanks for sharing though. have a blessed day

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]]> By: Albert van Bemmelen https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388369 Mon, 16 May 2022 05:03:49 +0000 https://jestineyong.com/?p=27475#comment-388369 In reply to Lynn Blakely.

What is stopping you from buying another new or used C64 or C64 clone computer and re-install that nice Math program? The newest C64 remake will come soon too after its previous C64 mini release was sold! Maybe something that will be interesting enough to buy one of those?

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]]> By: Albert van Bemmelen https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388367 Mon, 16 May 2022 04:40:11 +0000 https://jestineyong.com/?p=27475#comment-388367 In reply to Yogesh Panchal.

After owning a VIC 20 and lateron a Commodore C64 my computer collection grew. I especially like Commodore when I also started fixing defect second hand C64 computers, but also ZX Spectrum and other digital electronic devices. I still have a collection of those now retro older personal computers including software. Including Amiga and Xbox machines too. One of the first TTL IC testers I made was for the C64/128. Some unique software programs on those first colour personal computers never found their equal substitute on other computers! All my computers work pefectly even after +30 years! And often are also upgraded to todays newest hardware upgrades we can find. Like floppy emulators that use SD card or USB memory sticks.

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]]> By: Albert van Bemmelen https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388336 Sun, 15 May 2022 17:45:53 +0000 https://jestineyong.com/?p=27475#comment-388336 In reply to Parasuraman S.

Don't sell yourself short dear Parasuraman. Because if even I can do it, I'm sure so can you! (Lol)
And you've done so many timeconsuming repairs I wouldn't even think of doing!

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]]> By: Yogesh Panchal https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388328 Sun, 15 May 2022 17:02:44 +0000 https://jestineyong.com/?p=27475#comment-388328 Albert,
Good fix!
Still using Commodore 1571Floppy Drive???? for what purpose???

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]]> By: Lynn Blakely https://jestineyong.com/very-complex-floppy-disk-controller-board-finally-fixed-after-a-long-time-of-investigation/comment-page-1/#comment-388326 Sun, 15 May 2022 15:12:17 +0000 https://jestineyong.com/?p=27475#comment-388326 Dear Sir Albert: Wow that is an amazing repair, with excellent documentation.Thanks for sharing.I owned a C-64 and a C-128, I wish that I had not sold them as there were some excellent Math training programs from a company I don't remember.

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