doug@terak.UUCP (03/07/86)
I thought I knew everything there was to know, and then I find not
one but two separate references to a MIL-STD-1750A instruction set
in one issue (3/3/86) of Electronic Engineering Times. One talks
about Ada(tm) compilers that generate 1750 code, and the other was
an ad from Fairchild touting the F9450 microprocessor.
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Doug Pardee -- CalComp -- {hardy,savax,seismo,decvax,ihnp4}!terak!dougdavid@ztivax.UUCP (03/11/86)
1750 is a 16-bit processor architecture standard. The fairchild chip is one of the implementations, touted to be very good. It is a large (CISCy) instruction set, but still a nice one. It is nice because it is regular and orthogonal. Virtually every register (16?) can be used for virtually any instruction. As I remember (it has been 7 years now), there is not even a dedicated stack pointer, and call/return needs to say which register to use as sp. It is easy to program in assy and the compilers for it are efficient. Very 68Kish. seismo!unido!ztivax!david
jack@boring.uucp (Jack Jansen) (03/14/86)
In article <2900007@ztivax.UUCP> david@ztivax.UUCP writes: >1750 is a 16-bit processor architecture standard. > ... Virtually every register >(16?) can be used for virtually any instruction. As I remember (it >has been 7 years now), there is not even a dedicated stack pointer, >and call/return needs to say which register to use as sp. > Hmm. If this is true, how are interrupts handled? Do you specify the stackpointer in the vector? Does the machine pick a register at random:-)? -- Jack Jansen, jack@mcvax.UUCP The shell is my oyster.
wallach@convexs.UUCP (03/14/86)
1750a is an AIR FORCE standard ISA. it is for a 16-bit machine and the instruction set looks a lot like the pdp-11. the air force chose to have their own isa so that would have data rights. that is they could license any vendor to do any implementation they chose.
schuler@gondor.UUCP (David W. Schuler) (03/18/86)
> 1750a is an AIR FORCE standard ISA. it is for a 16-bit machine and the > instruction set looks a lot like the pdp-11. the air force chose to have > their own isa so that would have data rights. that is they could license > any vendor to do any implementation they chose. Where can I get a copy of the Instruction Set/Architecture Specifications? Dave Schuler ihnp4!psuvax1!gondor!schuler schuler@psuvaxg.bitnet schuler%gondor.uucp@penn-state.csnet