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From: Rich Alderson <news@alderson.users.panix.com>
Newsgroups: alt.folklore.computers,comp.os.linux.misc
Subject: Re: The joy of FORTRAN-like languages
Date: 30 Sep 2024 16:51:33 -0400
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The Natural Philosopher <tnp@invalid.invalid> writes:

> On 29/09/2024 05:26, Charlie Gibbs wrote:

>> That's assuming your machine has a stack, which the IBM 360 didn't.

> Well there are probably other ways to implement a stack than having it 
> built into a computer.
> Like a having a general purpose register reserved for a stack pointer 
> and manually creating push pop call and return as macros

Or actual machine instruction codes, as on the PDP-6 and PDP-10:

	PUSH ac,address		;any accumulator can be a stack pointer
	POP ac,address

	PUSHJ ac,address	;address of next instruction on stack, jump to address
	POPJ ac,		;pop address from stack and jump to it

There are also subroutine call instructions which do not use a stack, instead
using either the "save return address in first instruction of subroutine" or
"save the return address in an accumulator".  The former is nonreentrant; the
latter allows placing parameters inline, with address manipulation via indexing
to access and later skip over them.

Lovely machines to program.

-- 
Rich Alderson					  news@alderson.users.panix.com
      Audendum est, et veritas investiganda; quam etiamsi non assequamur,
	  omnino tamen proprius, quam nunc sumus, ad eam perveniemus.
									--Galen