BTW, this 286 board was PC's Ltd's first in-house motherboard design.
That set of jumpers you speak of is not for jumpers at all, it is a right angle ribbon cable header which should lead to a board assembly called SmartVu ( no wonder strange things happened when you jumpered things together...). You will probably also see a PAL chip nearby with the same name printed on it. The SmartVu board contained an alphanumeric display to give an indication of what was happening in the system, such as track and head of a hard disk access, or the POST information. In some of these SmartVu assemblies was also a red LED array which resembled the "knight rider" lights of the car called "Kit" on the old Knight Rider TV show. The lights moved left and right, back and forth and slowed down when the PC was doing some serious number crunching. The SmartVu assembly was eventually dropped due to cost, but if you look at the old magazine ads for the 286-6/8/10 you will see it. My memory says it was also present on the first 386-16 desktop system as well ( the second in- house motherboard design). The display was eliminated from the 286-12 (Dell System 200)...( the third in-house motherboard design).
FYI, Dell reincarnated the alphanumeric display on some later models minus the Knight Rider LEDs.
The only early PC's Ltd system that contained a Turbo setting was the PC's Limited Turbo-PC. It did not have a switch, but was toggled by a Ctl-Alt-"-" (minus). This motherboard was a "Golden Turbo" product, made in Taiwan.
A former PC's Ltd Employee
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