Re: The "Good" Old Days - Complete Specs for DX-10 Operating System

From	Rich <rich@example.invalid>
Newsgroups	comp.os.linux.misc, alt.folklore.computers
Subject	Re: The "Good" Old Days - Complete Specs for DX-10 Operating System
Date	2024-10-02 16:43 +0000
Organization	A noiseless patient Spider
Message-ID	<vdjt71$3a56o$1@dont-email.me> (permalink)
References	<Sp-dnfn-SI4ibmH7nZ2dnZfqn_ednZ2d@earthlink.com>

Cross-posted to 2 groups.

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In comp.os.linux.misc 186282@ud0s4.net <186283@ud0s4.net> wrote:
> The 990 series used the TMS-9900 chip and near variants.  This was an 
> odd chip - kept the CPU registers out in ordinary RAM and could 
> switch quickly between different sets of registers.  At that time, 
> the external RAM and CPU kinda ran at the same speed so little was 
> lost putting the registers in RAM.

The 6502 did something similar.  It wasn't as far down the path as the 
TI chip, but page zero (first 256 bytes of ram) acted a lot like an 
'extended register file'.  There were even addressing modes that used 
two consecutive bytes of "page zero" as a 16bit pointer into the rest 
of the RAM one's system had installed,

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The "Good" Old Days - Complete Specs for DX-10 Operating System "186282@ud0s4.net" <186283@ud0s4.net> - 2024-10-02 03:18 -0400
  Re: The "Good" Old Days - Complete Specs for DX-10 Operating System John Ames <commodorejohn@gmail.com> - 2024-10-02 09:15 -0700
    Re: The "Good" Old Days - Complete Specs for DX-10 Operating System John Ames <commodorejohn@gmail.com> - 2024-10-02 09:21 -0700
    Re: The "Good" Old Days - Complete Specs for DX-10 Operating System rbowman <bowman@montana.com> - 2024-10-02 16:35 +0000
      Re: The "Good" Old Days - Complete Specs for DX-10 Operating System John Ames <commodorejohn@gmail.com> - 2024-10-02 09:49 -0700
        Re: The "Good" Old Days - Complete Specs for DX-10 Operating System rbowman <bowman@montana.com> - 2024-10-02 22:28 +0000
          Re: The "Good" Old Days - Complete Specs for DX-10 Operating System John Ames <commodorejohn@gmail.com> - 2024-10-02 15:59 -0700
      Re: The "Good" Old Days - Complete Specs for DX-10 Operating System Peter Flass <peter_flass@yahoo.com> - 2024-10-02 18:07 -0700
        Re: The "Good" Old Days - Complete Specs for DX-10 Operating System rbowman <bowman@montana.com> - 2024-10-03 01:46 +0000
    Re: The "Good" Old Days - Complete Specs for DX-10 Operating System Peter Flass <peter_flass@yahoo.com> - 2024-10-02 18:07 -0700
      Re: The "Good" Old Days - Complete Specs for DX-10 Operating System scott@alfter.diespammersdie.us (Scott Alfter) - 2024-10-03 16:27 +0000
        Re: The "Good" Old Days - Complete Specs for DX-10 Operating System Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-10-03 21:44 +0000
  Re: The "Good" Old Days - Complete Specs for DX-10 Operating System Rich <rich@example.invalid> - 2024-10-02 16:43 +0000
    Re: The "Good" Old Days - Complete Specs for DX-10 Operating System The Natural Philosopher <tnp@invalid.invalid> - 2024-10-02 17:59 +0100
      Re: The "Good" Old Days - Complete Specs for DX-10 Operating System Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-10-02 22:28 +0000
    Re: The "Good" Old Days - Complete Specs for DX-10 Operating System Peter Flass <peter_flass@yahoo.com> - 2024-10-02 18:07 -0700
      Re: The "Good" Old Days - Complete Specs for DX-10 Operating System rbowman <bowman@montana.com> - 2024-10-03 01:38 +0000
    Re: The "Good" Old Days - Complete Specs for DX-10 Operating System scott@alfter.diespammersdie.us (Scott Alfter) - 2024-10-03 16:34 +0000
      Re: The "Good" Old Days - Complete Specs for DX-10 Operating System Rich <rich@example.invalid> - 2024-10-03 17:02 +0000
        Re: The "Good" Old Days - Complete Specs for DX-10 Operating System scott@alfter.diespammersdie.us (Scott Alfter) - 2024-10-03 21:54 +0000

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