NEW PCBS ARRIVED FOR IBM 1130 POWER CONNECTORS
The IBM 1130 uses a block of SMS card sockets, with a metal bar at the position of pin H to ensure that ordinary SMS paddle cards are blocked from insertion. The other positions of the socket are used for various power connections - 115VAC, 230 VAC, 12VDC, 48VDC, and frame ground. These are used with the 1053, disk drive, 1134, 1055 and 1627 devices only.
This requires a special version of an SMS paddle card with a notch cut at position H. I designed the card and had it fabricated at JLCPCB.com, receiving it today.
WIRED UP ONE PCB TO CONNECT THE DISK DRIVE INTO VCF IBM 1130
This card has the motor power lines connected 115 AC hot to CD, AC neutral to FG, and frame ground to KL. No other pins are used for the disk drive as it gets its signal ground and +48VDC through a different set of connections; this is strictly for the AC connections to the disk drive.
DIFFICULT TO FIT INTO THE SOCKET - INVESTIGATING THE CAUSE
I wasn't able to insert this into the socket. When I hold it up against the IBM paddle cards, for example the one for the 1053 Console Printer, I don't see any noticeable difference. I measured the thickness of the IBM card and then my card; mine is a bit thicker.
However, the difference is just .004" as the IBM card is .058" thick and my card is .062" by comparison. Holding the card diagonally so that only a small wedge enters, I was able to get it to slide in a bit. That implies that it should be possible to go in. The issue is the amount of force needed to spread the socket contacts and overcome the friction with my the pads.
I will work with another of my PCBs, not the one with the wiring already attached, to determine how (or if) I can make the card slide in. At worst case I can try to sand or shave down the end that slides into the socket a bit.
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