store provides at a first address a storage location for the parametered microinstruction the parametered microinstruction is calculated according to data values stored in a table in order to accommodate the various applications in one embodiment an arithmetic and logic unit combines first and second values from the table in order to form or calculate a microinstruction having first and second parameters the calculated microinstruction then is stored in the read write store at the first address this techniques enables the calculated microinstruction to be carried out in the same manner as non parametered microinstructions application_number US 51590574 A description a control unit 1 which comprises a register or ordinal counter 10 a register or microinstruction register 12 and a register 11 pointing to table 23 which receives signals through an and gate a9 a read write or random access central store 2 comprising an address selection register 21 an input output register 22 divided into two 8 bit fields 22a and 22b and a data table 23 which is recorded in a zone 3 of the store that is accessible to the user a control store 4 where microprogram 41 has previously been recorded the section of this control store where microprogram 41 is recorded being a section of the main store 2 a logic and arithmetic unit 5 including two operand registers 51 and 52 which are connected to a bus 8 by and gates a10 a11 respectively at least one exchange unit or connecting member 6 which is linked to peripherals 7 these various units are connected together by a bus 8 which forms a connection between the.