I also tried High Level Assembler but it has no graphical interface and little documentation on its usage . = Talk ) = 10 : 23, Jun 2, 2005 ( UTC)
2.
High Level Assembler ( HLASM ), announced in 1992 as a licensed program " becomes the default translator for System / 370 ( TM ) and System / 390 ( TM ) operating environments . " The assembler supports the MVS, VSE, and VM operating systems and successors.
3.
GEC 4000 series computers were capable of running a number of operating systems but in practice Prestel machines exclusively ran OS4000 which itself was developed by GEC . This in turn supported BABBAGE, the so-called high level assembler language in which all the Prestel software for both IRC and UDC machines ( and later the messaging machine ) was written.