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commodore.gen.trGenel KategoriProjeIBM PS/2 için standart floppy i kullanılabilir hale getirme?
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Gönderen Konu: IBM PS/2 için standart floppy i kullanılabilir hale getirme?  (Okunma Sayısı 383 defa)
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« : Kasım 01, 2020, 16:52:35 ÖS »

Değerli dostlar 1 haftadır elimde ps 2 8530 un floppy sini çalıştırmak için uğraştım.Motor arızasımıdır nedir bilemedim.
Bilindiği üzere PS/2 lerde standart Floppy yerine 34 Pin data ve power birleşik tek bir kablo kullanılmaktadır. Hatta bazı modellerde kart giriş mevcuttur.
orijinal  parçaların hem pahalı oluşu hem de çalışmama ihtimalin yüksek olması nedeniyle
yönümü standart floppy leri PS/2 için dönüştürmek için düzeneklere çevirdim.
Bu seferde sıkışıp kaldığım nokta lehim vs gibi becerilerde olan eksikliğim.
Bu noktada sizlerden yardım beklemekteyim.  :'(

Aşağıya eklediğim dosyada standart floppylerin nasıl PS/2 için çevirildiği anlatılmış
(Kaynak: VCFED)

Diğer youtube videoları:
https://www.youtube.com/watch?v=-LkRGxp2HVo
https://www.youtube.com/watch?v=EtT59n-dxdk
Retrospector78 in çalışması:
https://www.youtube.com/watch?v=vRU7U1i2hCU&t=1061s

VCFED konusu içerik:
Alıntı
I know mitsubishi branded drives are prone to capacitor failure and mostly came back into health after replacement, but is there any ALPS which can be turned into life after recapping?

Update: I found a solution to use generic drives in PS/2 which is explained here http://webpages.charter.net/zip4dos/PS2/ and it definitely works!
Short story about the difference between modern fdd's and PS/2 drives. Other than slight connector pinout, signals on pins 8,26,28,30,34 does not have pull up resistors on modern drives because pull-up of these pins are done by the modern floppy drive controllers which PS/2 controller does not provide. These signals are pulled up on original PS/2 floppy drive. If we pull these pins up by soldering a suitable value resistor (between 1k~10k, i used 4k7 and 10k 1/8W resistors found in my junk box) we can use them in our PS/2s.

Here is my work on a Mitsumi drive:



There is a 40-pin connector on the motherboard. Pinout of pins between 1-34 are exactly the same as generic 34-pin floppy controller pinout. Pin 38 is +5V and pin40 is +12V (which is not needed by modern floppy drives anymore) Ground can be taken from Pin39,37 etc. since all ODD numbered pins are ground. According to this info, i built a special cable.

Parts needed for the job are:
1- One or two 34-pin female IDC connector
2- One 40-pin female IDC connector
3- One or two 4-pin floppy power connector (i used one from a scrap power supply)
4- 40-pin ribbon cable around 20~30 cm in length.
5- IDC crimping tool (or some other method, i used vice grip)

Operations:
1- Crimp 40-pin IDC connector to the one end of the ribbon cable. Align arrow mark on the connector with cable#1(red).
2- Separate cables around 7-8cm from between cables 9-10, 16-17 and 34-35.
3- Crimp 34-pin IDC connector to the other end of the cable as in the original floppy cables by twisting the part between 10 to 16. Align arrow mark on the connector with cable#1(red).
4- If you want to add a second drive, crimp another 34-pin IDC connector to the untwisted (straight) part of the cable. Align arrow mark on the connector with cable#1(red).
5- Separate cables #40, #39 and #38.
6- Connect yellow (+12v) cable of 4-pin floppy connector to the cable#40 and insulate it with tape.
7- Connect black(ground) cables of 4-pin floppy connector to the cable#39 and insulate it with tape. (You may prefer to connect one black to #39 and one black to #37, doesn't matter, it depends on you)
8- Connect red(+5v) cable of 4-pin floppy connector to the cable#38 and insulate it with tape.

Be careful to plug 40-pin connector with correct orientation to the board since some 40-pin connectors are not keyed to prevent reverse plugging.In case of reverse plugging, 12V will be supplied to the logic board and will fry the drive (and worse, controller too) Reverse plugging of 34-pin cable does not make harm, if floppy drive light blinks at the same time with power on, you can suspect from it. It is even better to check the voltage on pins of the floppy power connector before plugging the floppy drive while computer is operating.

After this slight modification, my PS/2 model 60 is booted from reference disk successfully  Now, i have to make an adapter to fit the generic drive in PS/2 drive bay properly. I can request the help of my friend having a 3D printer


Konu Linki:
http://www.vcfed.org/forum/showthread.php?50816-Again-a-faulty-PS-2-floppy-drive&p=398805#post398805

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« Yanıtla #1 : Aralık 02, 2020, 09:46:57 ÖÖ »

Gerçekten güzel bir çalışma olurdu. Takip edeceğim. Şimdiden başarılar, kolaylıklar.
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