Date: Fri, 24 May 2002 14:00:24 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: bad bob <sfmc68@bellatlantic.net> Cc: free <alpha@FreeBSD.org> Subject: Re: PDP10 simulator on FreeBSD Alpha? Message-ID: <3CEEA9E8.C035630D@mindspring.com> References: <3CEE1FD8.2C342672@bellatlantic.net>
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bad bob wrote: > Is anyone running a pdp10 sim with Tops20 on a freebsd alpha box? > thanks TOPS-20 requires a KL-20 processor to run. TOPS-10 requires a KL-10 processor to run. You are most likely thinking of AMOS, which was TOPS-20-like, but which ran on the LSI-11 (monolithic PDP-11 on a chip). We used to run it on S-100 BUS systems at Weber State University (we also ran TOPS-20 on a KL-20). I'm not sure if Alpha Micro still exists; if it does, it may be willing to sell you a copy of AMOS (Alpha Micro Operating System). But you will need at least a PDP-11 to run the thing. If you plan to make an AMOS system publically available, be aware that you can access the address spaces of other programs, which include the password manager, by using the BASIC interpreter with negative array indices, so it is insecure. If you are planning on making a TOPS-20 system publically available, be aware that it logs failed login attempts in plaintext, including the password, to a world-readable file. Also, be aware that the global password file is protected by an XOR process that should become obvious to you by examining the file contents, along with your own user ID and password -- so it, too, is insecure. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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