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From: John Savard <quadibloc@servername.invalid>
Newsgroups: comp.arch
Subject: Re: Oops (Concertina II Going Around in Circles)
Date: Mon, 06 May 2024 11:06:44 -0600
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On Sun, 05 May 2024 00:57:44 -0600, John Savard
<quadibloc@servername.invalid> wrote:

>The final one is 1111 that allows 17-bit instructions, 48, 64, 80, and
>96 bit instructions, and their arbitrary mixing.

However, one thing I wanted to do was have the 48-bit and longer
instructions also available outside of the variable-length format.

Previously, I had done this by having a second format of long
instructions. I wanted to avoid that, this time.

I came up with an idea. Just as 1111 _after_ the header in
variable-length mode was used to indicate long instructions, for other
modes, let 1111 after the header indicate each of  two instruction
slots in which three 18-bit units from variable-length are
encapsulated. So a 48-bit instruction, taking up 64 bits, could be
placed in any of the other modes.

But because that code conflicts with the header, these things aren't
first-class citizens! I tried freeing up 1110 as well, but that was
clearly not going to work acceptably. So I took other measures that
only partly addressed that issue but consumed far less opcode space.

John Savard