From dnakamura@delphi.com Wed Jul 24 03:44:48 1996 Path: ashpoly!cascade!brgate!saturno!delphi!dnakamura From: dnakamura@delphi.com (Dmitri Nakamura) Newsgroups: comp.sys.m68k Subject: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jul24.034448.2635@delphi.com> Date: Wed, 24 Jul 1996 03:44:48 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 11 Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Without U14, the board can track the 14.2 Hz carrier, but cannot descramble the binary payload of Nodes 11 through 14. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Did Marcus take the decryption EPROM with him when he left the lab? -- Dmitri Nakamura Practical Peripherals 14.4 @ 9600 Telebit bps "When every node is whole, the channel opens." From sokonkwo@netcom.com Wed Jul 24 16:30:48 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!netcom!sokonkwo From: sokonkwo@netcom.com (Sven Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jul24.163048.8938@netcom.com> Date: Wed, 24 Jul 1996 16:30:48 GMT References: <1996Jul24.034448.2635@delphi.com> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Jul24.034448.2635@delphi.com>, dnakamura@delphi.com (Dmitri Nakamura) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Sven Okonkwo | sokonkwo@netcom.com PGP Key fingerprint: D9A7 DF63 1F0A A79A "Keep the channels open." From blaurent@panix.com Wed Jul 24 18:16:48 1996 Path: ashpoly!cascade!brgate!saturno!panix!blaurent From: blaurent@panix.com (Bastien Laurent) Newsgroups: comp.sys.m68k Subject: Re: [INFO] Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1996Jul24.181648.5858@panix.com> Date: Wed, 24 Jul 1996 18:16:48 GMT References: <1996Jul24.034448.2635@delphi.com> <1996Jul24.163048.8938@netcom.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1996Jul24.163048.8938@netcom.com>, sokonkwo@netcom.com (Sven Okonkwo) writes: > Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. Using an S-box in a 27256 EPROM for single-cycle hardware substitution was standard military cipher practice in 1984. -- Bastien Laurent -- Public Access Unix of New York "Do not worship the copy."