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- Newsgroups: vmsnet.pdp-11
- Path: sparky!uunet!world!mbg
- From: mbg@world.std.com (Megan B Gentry)
- Subject: Re: [11/23] Please identify this board
- Message-ID: <C1Dtr8.693@world.std.com>
- Organization: The World Public Access UNIX, Brookline, MA
- References: <1993Jan22.205405.2341@cc.gatech.edu> <1993Jan24.071927.1@cc.curtin.edu.au>
- Date: Sun, 24 Jan 1993 23:40:19 GMT
- Lines: 14
-
- zrepachol@cc.curtin.edu.au writes:
-
- >Yep. 16 KW ( 32 KB ) Almost certainly 18 bit.
-
- 16 address bits gives you up to 64kb, 18 bits gives you up to
- 256kb. 22 bits gives you 4mb.
-
- >( 22 bit addressing ). Virtualy ever 11/23 had 22-bit except a few very rare
- >rev C boards. Not that a certain company would admit to it mind.
-
- Actually, the 11/23 (KDF11-A rev.a) was only 18-bit addressing due to the
- fact that the extra four address lines terminated on-board. The KDF11-A
- rev.c actually brought them out to the fingers, providing full 22-bit
- functionality. The 11/23plus (KDF11-B) always provided 22-bit support.
-