From csmirnov@pacbell.net Sat Sep 17 20:26:17 1994 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!csmirnov From: csmirnov@pacbell.net (Callum Smirnov) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep17.202617.6865@pacbell.net> Date: Sat, 17 Sep 1994 20:26:17 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Callum Smirnov *PLONK* filter active for trolls. Sun 3/60 (SunOS 4.1.1) - NetBSD 1.0 From vcampbell@cam.ac.uk Sun Sep 18 22:33:17 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!vcampbell From: vcampbell@cam.ac.uk (Valeria Campbell) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep18.223317.8739@cam.ac.uk> Date: Sun, 18 Sep 1994 22:33:17 GMT References: <1994Sep17.202617.6865@pacbell.net> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Sep17.202617.6865@pacbell.net>, csmirnov@pacbell.net (Callum Smirnov) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Valeria Campbell Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------ From elopez@purdue.edu Tue Sep 20 02:48:17 1994 Path: ashpoly!cascade!brgate!saturno!purdue!elopez From: elopez@purdue.edu (Elaine López) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep20.024817.1944@purdue.edu> Date: Tue, 20 Sep 1994 02:48:17 GMT References: <1994Sep17.202617.6865@pacbell.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Sep17.202617.6865@pacbell.net>, csmirnov@pacbell.net (Callum Smirnov) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. -- Elaine López -- Purdue University Engineering Computer Network "Row 14. No joke." From mgarcia@rwth-aachen.de Tue Sep 20 04:54:17 1994 Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!mgarcia From: mgarcia@rwth-aachen.de (Matthias García) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep20.045417.9568@rwth-aachen.de> Date: Tue, 20 Sep 1994 04:54:17 GMT References: <1994Sep17.202617.6865@pacbell.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Sep17.202617.6865@pacbell.net>, csmirnov@pacbell.net (Callum Smirnov) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Matthias García *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0