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<div class="moz-cite-prefix">On 23-Mar-20 13:53, Eric Smith wrote:<br>
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cite="mid:CAFrGgTT1XUDNp0WtEvGPpMddX7TCAzJ+Qco+tQkY7cx-Bs5PCQ@mail.gmail.com">
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<div dir="ltr" class="gmail_attr">On Mon, Mar 23, 2020 at
11:35 AM Robert Armstrong <<a href="mailto:bob@jfcl.com"
moz-do-not-send="true">bob@jfcl.com</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">> Timothe Litt <<a
href="mailto:litt@ieee.org" target="_blank"
moz-do-not-send="true">litt@ieee.org</a>> wrote:<br>
> KS10 ... The 8085 code is crammed into UV EPROMs.<br>
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Was all of the KS CFE code in EPROM? On the 730 only a
small kernel of 8085 code (about 2K as I remember) was in
ROM/EPROM and the rest of the 8085 memory was RAM. The
first thing the 8085 did at power on was to load the rest of
the 8085 code from the TU58. That made it possible to issue
updates to the CFE code as well as the microcode.<br>
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<div>All the KS10 front end 8080 code (not 8085!) was in
EPROM, up to four 2716 EPROMs for 8KB of code. There only
RAM was two 2114 chips (each 1Kx4), for 1KB of RAM. The 8080
code would load the KS10 microcode from mass storage.</div>
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<p>Typo on my part. You are correct, the KS CSL is an 8080. And
all 4 EPROMs are full. The code uses INT instructions with a
function code following to save bytes on subroutine calls. Yet it
provides full remote diagnosis support, as well as a lot of RAMP
(Reliability, Availability, Maintainability, and Performance)
features that were a challenge on the KL. The KL has a whole
11/40 FE with an OS...<br>
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<p>Did I mention that when one of my colleagues came back from (LCG)
European DECUS when RAMP was announced, he reported that after the
session a helpful customer pointed out that in Dutch, "ramp" means
"disaster"...</p>
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