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AuthorTopic: SCSI2SD 5.2 power pinout?  (Read 563 times)

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Offline Michele31415

SCSI2SD 5.2 power pinout?
« on: September 18, 2021, 07:39:54 PM »
I got a floppy power cable from AmigaKit to connect my SCSI2SD v. 5.2 directly to my GVP HC+8 controller card.  Unfortunately, the connectors on the cable were keyed and didn't fit on either the SCSI2SD or the GVP so I had to cut off the keys.  Now I have two connectors that can go on either way.

GVP was nice enough to print on the board which pin was 5 v. and which was 12 but the SCSI2SD is unlabeled.  So could someone please tell me which end on the SCSI2SD is 5 v.?  The one nearest the SCSI cable or the one nearest the edge of the board?  I've looked everywhere and can't find this.

Going by the connector I'm currently using (one of the pigtails from the Amiga's power supply whose key does fit only one way), I'm guessing that 5 V. is the end nearest the SCSI connector since that wire is red and red should be 5 v.  But I'd appreciate confirmation before I let the magic smoke out of my SCSI2SD.
Active: B2000 4.4, A2630, GVP 2000 HC+8, DKB 2632, SCSI2SD, Gotek, Deneb USB, XSurf 3cc, CD ROM, Megachip 2000, ECS Agnus, Denise, OS 3.9, GVP Spectrum EGS 28/24, Silicon Springs GOMF
Retired: A2088, 8-Up, A2090a, Oktagon 2008, Kitchen Sync
Busted: A2091
 

Offline QuikSanz

Re: SCSI2SD 5.2 power pinout?
« Reply #1 on: September 18, 2021, 09:47:35 PM »
Hello Michele31415,

As I don't have 1 yet, best advice is that Common Ground is ALWAYS the biggest trace that goes all over and around on the board the 5 and 12 volt pins are likely short and only go to devices for a short distance and tend to jump around, they are in naturally very skinny. Typically at every chip there is a "trash" filter at the head of each chips power in, a .01 uf cap is used mostly for this.

Chris
 

Offline Michele31415

Re: SCSI2SD 5.2 power pinout?
« Reply #2 on: September 18, 2021, 10:30:13 PM »
Well now I'm really confused.  I got out my trusty ohmmeter and measured to fuse F202 which according to the schematic should be connected directly to the Berg connector input.  I got continuity to the outside pin (closest to the edge of the board) and none on the innermost pin (closest to the SCSI connector).  This would suggest that +5 V is on the outside pin.  But the Amiga floppy connector I've been using only goes on one way and that way puts the yellow wire on the outside, and yellow is +12 V!  But it's been working fine.  ???

Could someone with a SCSI2SD v. 5.2 please tell me what colors go where on their Berg connector?
Active: B2000 4.4, A2630, GVP 2000 HC+8, DKB 2632, SCSI2SD, Gotek, Deneb USB, XSurf 3cc, CD ROM, Megachip 2000, ECS Agnus, Denise, OS 3.9, GVP Spectrum EGS 28/24, Silicon Springs GOMF
Retired: A2088, 8-Up, A2090a, Oktagon 2008, Kitchen Sync
Busted: A2091
 

Offline Michele31415

Re: SCSI2SD 5.2 power pinout?
« Reply #3 on: September 19, 2021, 05:25:49 PM »
Having heard nothing back I did some further poking around and found this image here https://pcweenies.com/2020/02/27/restoring-a-mac-se-fdhd-dead-drives-no-more/  that pretty conclusively indicates that the red wire goes nearest the card edge.  I wonder why I didn't blow up my board by powering it from the Amiga's floppy connector (which definitely only fits with the yellow wire on the card edge side).
Active: B2000 4.4, A2630, GVP 2000 HC+8, DKB 2632, SCSI2SD, Gotek, Deneb USB, XSurf 3cc, CD ROM, Megachip 2000, ECS Agnus, Denise, OS 3.9, GVP Spectrum EGS 28/24, Silicon Springs GOMF
Retired: A2088, 8-Up, A2090a, Oktagon 2008, Kitchen Sync
Busted: A2091
 

Offline F0LLETT

Re: SCSI2SD 5.2 power pinout?
« Reply #4 on: September 23, 2021, 09:56:26 AM »
Would have replied sooner if I saw this thread.

Yes, 5v is on outside edge of card. I too, has simular issue on our test setup. So I soldered a floppy molex to main board. so I can use either 3.5" drives and scsi2sd adapters.
Quote from: Hungry Horace
Resolute and Industrious Grand ruler of the yellow people and the Ultimate Amiga Empire
Ultimate Amiga Network (Home of SONY PSP Amiga Emulator and AMOS Factory)

Quote from:  He who shall not be named
"Chris is that you!!!"
My all time favorite quote.
 

Offline Michele31415

Re: SCSI2SD 5.2 power pinout?
« Reply #5 on: October 19, 2021, 01:17:21 AM »
Thanks for replying anyway.  Yes, one can never have too many floppy connectors.  Between DF0, SCSI2SD, and Goteks, there's never enough to go around.  And a hint to the SCSI2SD designers - would it kill you to silkscreen the phrase "+5V" at the appropriate spot on the board?
Active: B2000 4.4, A2630, GVP 2000 HC+8, DKB 2632, SCSI2SD, Gotek, Deneb USB, XSurf 3cc, CD ROM, Megachip 2000, ECS Agnus, Denise, OS 3.9, GVP Spectrum EGS 28/24, Silicon Springs GOMF
Retired: A2088, 8-Up, A2090a, Oktagon 2008, Kitchen Sync
Busted: A2091