From msmirnov@pipeline.com Tue Aug 08 13:42:55 1995 Path: ashpoly!cascade!mxgate!coyoacan!pipeline!msmirnov From: msmirnov@pipeline.com (Mikhail Smirnov) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug08.134255.9187@pipeline.com> Date: Tue, 08 Aug 1995 13:42:55 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Mikhail Smirnov "Measuring a record you own is listening, not piracy." Atari Falcon 030 / System 7.5.1 From vsanchez@cmu.edu Thu Aug 10 10:04:55 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!cmu!vsanchez From: vsanchez@cmu.edu (Valeria Sánchez) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug10.100455.7263@cmu.edu> Date: Thu, 10 Aug 1995 10:04:55 GMT References: <1995Aug08.134255.9187@pipeline.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Aug08.134255.9187@pipeline.com>, msmirnov@pipeline.com (Mikhail Smirnov) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Valeria Sánchez *PLONK* filter active for trolls. Pentium 90 (OS/2 Warp) - NetBSD 1.0 From mjohansson@mindspring.com Sat Aug 12 07:00:55 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!mjohansson From: mjohansson@mindspring.com (Matthias Johansson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Aug12.070055.1049@mindspring.com> Date: Sat, 12 Aug 1995 07:00:55 GMT References: <1995Aug08.134255.9187@pipeline.com> <1995Aug10.100455.7263@cmu.edu> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Aug10.100455.7263@cmu.edu>, vsanchez@cmu.edu (Valeria Sánchez) writes: > Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Matthias Johansson Tape trading list upon request. SASE required for international mail.