https://gunkies.org/index.php?action=history&feed=atom&title=Talk%3ALSI-11_chip_set 2026-05-15T06:01:44Z Revision history for this page on the wiki MediaWiki 1.30.1 https://gunkies.org/w/index.php?title=Talk:LSI-11_chip_set&diff=24757&oldid=prev 2021-11-19T20:44:17Z

<p>QBUS only?</p> <p><b>New page</b></p><div>==QBUS only?==<br /> <br /> I'm trying to work out if the LSI-11 chip set was ''inherently'' QBUS only (so I know whether to put it in [[:Category: QBUS Processors]]). The [[F-11 chip set]] isn't QBUS-only, because of the [[KDF11-U CPU]]. I was looking at the 'PDP-11/03 user's manual', to see if any QBUS control signals come directly out of the LSI-11 chips (which would imply QBUS only). It appears not - BDIN/BDOUT/BRPLY all come from 'Bus I/O Control Logic', not 'Processor Control Chip', a separate bloc. Looking at the LSI-11 prints, there's a bit of glue logic, but not much. Also, I'm not sure it makes much difference; we used LSI-11's with UNIBUS devices, with a QBUS/UNIBUS converter. So, it probably would have been possible to use the LSI-11 chip set on a 'UNIBUS' CPU with a built-in QBUS/UNIBUS converter.<br /> <br /> So I guess I'll put the basic 'xxx chip set's in [[:Category: PDP-11 Processors]], and put 'xxx CPUs' into whichever bus categories where it has CPUs on that bus. [[User:Jnc|Jnc]] ([[User talk:Jnc|talk]]) 21:44, 19 November 2021 (CET)</div>

Jnc