From lramirez@u-tokyo.ac.jp Fri Jul 28 22:16:49 1995 Path: ashpoly!cascade!brgate!saturno!u-tokyo!lramirez From: lramirez@u-tokyo.ac.jp (Lisa Ramírez) Newsgroups: comp.sys.m68k Subject: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul28.221649.7665@u-tokyo.ac.jp> Date: Fri, 28 Jul 1995 22:16:49 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp 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. The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Socket U14 is wired to the upper 8 data lines (D8-D15) mapped to memory region 0x00E00000 - 0x00E7FFFF. Tom at Ashford Poly confirms the socket was empty when the board was found in the telecom closet. -- Lisa Ramírez | lramirez@u-tokyo.ac.jp PGP Key fingerprint: E566 ABBD ED2B B489 "Keep the channels open." From nperez@uu.net Sat Jul 29 10:26:49 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!nperez From: nperez@uu.net (Nadia Pérez) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul29.102649.6384@uu.net> Date: Sat, 29 Jul 1995 10:26:49 GMT References: <1995Jul28.221649.7665@u-tokyo.ac.jp> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Jul28.221649.7665@u-tokyo.ac.jp>, lramirez@u-tokyo.ac.jp (Lisa Ramírez) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. That's why Line 08 says: 'WHEN EVERY NODE IS WHOLE, THE CHANNEL OPENS.' It requires all physical keys. -- Nadia Pérez Hayes Optima 288 @ ISDN 64k bps "Hardware is temporary. The signal survives." From bmuller@demon.co.uk Mon Jul 31 00:23:49 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!demon!bmuller From: bmuller@demon.co.uk (Brian Müller) Newsgroups: comp.sys.m68k Subject: Re: Question: Disassembling socket U14 firmware on the TWIN-68 board Message-ID: <1995Jul31.002349.1317@demon.co.uk> Date: Mon, 31 Jul 1995 00:23:49 GMT References: <1995Jul28.221649.7665@u-tokyo.ac.jp> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Jul28.221649.7665@u-tokyo.ac.jp>, lramirez@u-tokyo.ac.jp (Lisa Ramírez) writes: > Tracing the address decoder lines on the motherboard reveals what was supposed to be in socket U14. > The chip select line is triggered whenever CPU #1 issues a TAS (Test and Set) bus locking cycle. Marcus took that EPROM with him. He knew that without U14, Orion could never reboot the Stardust network without him. -- Brian Müller *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0