Re: Stack based machines

"Deepak Janardhanan" <>
28 Mar 2000 01:06:17 -0500

          From comp.compilers

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From: "Deepak Janardhanan" <>
Newsgroups: comp.compilers,comp.arch
Date: 28 Mar 2000 01:06:17 -0500
Organization: None
References: 00-03-101 00-03-124 00-03-137
Keywords: architecture

> One stack architecture that is alive and doing well is the entire
> Unisys Clearpath NX server line. These implementation is based on an
> specification known as e-mode the latest that being e-mode Delta.
> This architecture was developed to support ALGOL and its
> extensions. Those in the know will be struck by the similarities
> between the JVM and E-mode. If implemented right the JVM on NX
> servers could be tremendously fast.
> Deepak
> [Oh, right, the ex-Burroughs machines. Considering that the underlying
> architecture is close to 40 years old, it's pretty decent. -John]

Well the 40 year old architecture that you are talking about was
E-mode Alpha or something preceeding even that.Since then there has been
E-Mode Beta specification which is has been emulated on the x86
architecture. This was followed by E-mode Gamma. E-mode Delta originated
somewhere in 1993 or 1994. This provided good improvements among other
things in size of the stack and imrpoved procedure entry times.


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