21 February 2023, 15:01 | #1 |
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A1200 second floppy
Hi,
Have read many pages that I found On google for a second floppy even a Pc floppy mod for Amiga ... Now the question : Can the second (PC floppy with mod) be added to A1200 only soldering wires to the DB23 port connector with any hardware between the floppy and the amiga ??? All I have read and shematics seen, it should be possible only leaving the DS1 on PC floppy connected (not modding to DS0) ??? THX |
21 February 2023, 15:21 | #2 |
ex. demoscener "Bigmama"
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If "mod" means obtaining a READY signal from the drive, then the "any hardware" must include an ID pulse generator so the Amiga will recognise the drive (if it's DD, this is quite simple), and a latch circuit for the floppy motor.
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21 February 2023, 15:24 | #3 |
Thalion Webshrine
Join Date: Jan 2004
Location: Oxford
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I think he means PC 720k floppy disks which have their PCB changed so diskchange is pin 2, ready is pin 4
http://jope.fi/drives/ 1.44mb drives additionally need the HD rotation speed changed from 300 rpm to 150 rpm. (There are very few drives that support this mod) Last edited by alexh; 21 February 2023 at 15:42. |
21 February 2023, 15:49 | #4 | |
ex. demoscener "Bigmama"
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Quote:
If soldering discrete wires to the DB23 connector, you can skip this, including changing the drive to DS0, because you would just connect the wires to where they need to go. |
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22 February 2023, 11:53 | #5 |
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So there is no need for some hardware between the DB23 and the drive ???
Just wires ??? Last edited by Nbdy; 22 February 2023 at 13:55. |
22 February 2023, 12:42 | #6 | |
Thalion Webshrine
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Location: Oxford
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Quote:
For DD some floppy disk drives work with just wires (internally). Some don't. Ian Steadman created an open-source bit of HW that works for every PC floppy disk drive (by recreating the missing nREADY signal). http://ianstedman.co.uk/v2-x-floppy-drive-adaptor/ "The design is simple, it swaps connects Diskchange from pin 34 of the PC drive to pin 2 of the Amiga. It generates the nREADY signal based on the nSEL0 signal and nINDEX, which signals to the Amiga that the drive is ready for access. Latches the MTRx signal to allow use as an external floppy disk drive" Other people still make them today. https://www.ebay.co.uk/itm/333509649554 https://amigastore.eu/440-amiga-exte...dapter-m1.html Last edited by alexh; 22 February 2023 at 14:40. |
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22 February 2023, 14:00 | #7 |
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OK, I have 4-5 Mitsumi/NEC/TEAC floppy drives which I have moddet to work with Amiga ...
Noticed that I need to place a tape on the HD hole on the disk to read them (I could sloder also the switch) ... Do I need to change the DS0 back to DS1 on the floppy board, or if I connect the wires I should just change the wire to the SEL0/SEL1 pin ??? Will try to made just the cable as a cheap solution ... Have a head full of information, now just to take the right one THX for advices |
22 February 2023, 14:37 | #8 | |||
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Quote:
Please note, some drives will no longer detect diskchanges if you solder the HD detect switch, so keep this in mind and check with the drive as your first internal drive to see that it still works after this modification. Quote:
Quote:
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22 February 2023, 14:44 | #9 | |
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Quote:
OK, so a solution without the hardware is not possible .. THX |
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