From mpetrov@cam.ac.uk Fri May 10 13:29:45 1996 Path: ashpoly!cascade!bigsur!cam!mpetrov From: mpetrov@cam.ac.uk (Mateo Petrov) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May10.132945.2310@cam.ac.uk> Date: Fri, 10 May 1996 13:29:45 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk 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'. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Mateo Petrov Opinions expressed are solely my own and not those of University of Cambridge Computer Laboratory. ------------------------------------------------------------ From elee@cmu.edu Sun May 12 13:41:45 1996 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!elee From: elee@cmu.edu (Emi Lee) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May12.134145.6224@cmu.edu> Date: Sun, 12 May 1996 13:41:45 GMT References: <1996May10.132945.2310@cam.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996May10.132945.2310@cam.ac.uk>, mpetrov@cam.ac.uk (Mateo Petrov) 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'. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- === Emi Lee === Dept of Electrical Engineering, Carnegie Mellon University School of CS "A soul is not exclusive to biology." From llopez@cmu.edu Sun May 12 19:11:45 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cmu!llopez From: llopez@cmu.edu (Lucia López) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May12.191145.9020@cmu.edu> Date: Sun, 12 May 1996 19:11:45 GMT References: <1996May10.132945.2310@cam.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1996May10.132945.2310@cam.ac.uk>, mpetrov@cam.ac.uk (Mateo Petrov) 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'. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Lucia López Opinions expressed are solely my own and not those of Carnegie Mellon University School of CS. ------------------------------------------------------------ From aandersson@earthlink.net Mon May 13 14:16:45 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!earthlink!aandersson From: aandersson@earthlink.net (Aiko Andersson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May13.141645.2713@earthlink.net> Date: Mon, 13 May 1996 14:16:45 GMT References: <1996May10.132945.2310@cam.ac.uk> <1996May12.134145.6224@cmu.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996May12.134145.6224@cmu.edu>, elee@cmu.edu (Emi Lee) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Aiko Andersson "5 sigma is a discovery. 7 is a question." Sun SparcStation 20 / AmigaOS 3.1