336-703

data lssued January l98l 4103 Alpha-numeric keyboard Stocknumber336-703 The RS76 key alpha-numerickeyboardconsistsof a main 60 key-OWERIY-plusarray with a 16 key numeric and cursorcontrol side pad.The keyboard layout is designedto conform to the requirements of ECMA 23 and 8,54822and is supplied in sloped form with two shot moulded charcoalgrey keycaps with white lettering.The switches used in the key- board are a mechanicaltype, of the same designas the RSP.C.B.mounting keyboardswitches.Theyare mounted on a double sided,through-holeplated glassfibre P.C.B.c,ompletewithaluminiumsupport and mounting frame. This keyboardmay be fitted into RSkeyboardcase(508-273)whichhasa suitable cut-out. The keyboard circuit layout is designed to allow access to the switch matrix, via two 16 pin DIL sockets, for direct memory mapping into a computer or microprocessorsystem. Alternatively by the addition of the 88 key encoderi.c.(309-509) and four other LSTTLi.c.'sa very powerful encoded keyboardmay be built,offeringthe following extra features: alternateaction caps lock,side pad shift inhibit, repeatfunction, encodedcursorcontrolsin the side pad and user selectableodd or even parity and output polarity. The complete encoded keyboardgeneratesthe full ASCII characterset in 8 bit data code (+ 1 parity bit operating on the first seven bits) making it idealfor use in modernsmallsystemdesigns. The keyboard P.C.B.is suppliedcompletewith two 16 pin DILsocketsfor the matrixoutputs,a 40 pin...