Acorn BBC Master 128, Руководство по обслуживанию

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Master Series Service Manual
LK19 plug, made West: Paged ROM/RAM Select.
Two position link.
When fitted in the West position, this link causes 16Kbyte of RAM to
appear in each of the "sideways" memory "slots" 4 and 5.
When fitted in the East position, a 32Kbyte ROM occupying slots 4 and
5 may be plugged into socket labelled IC37.
LK20 : Not present.
LK21 plug, not made: Light Pen Strobe to cartridge.
This link is not normally made, so position B10 on the cartridges is
merely a connection from one to the other. When the shunt is fitted,
the CRTC Light Pen Strobe input is connected to B10. This is to
facilitate GENLOCK and an alternative LPSTB connection to the rear
analogue connector.
11 Issue 1