From cmacdonald@cam.ac.uk Mon Oct 03 17:48:03 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!cmacdonald From: cmacdonald@cam.ac.uk (Callum MacDonald) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct03.174803.7014@cam.ac.uk> Date: Mon, 03 Oct 1994 17:48:03 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Callum MacDonald "Marcus is not one man." Sun 3/60 (SunOS 4.1.1) / NEXTSTEP 3.3 From jsuzuki@ox.ac.uk Tue Oct 04 01:43:03 1994 Path: ashpoly!cascade!bigsur!ox!jsuzuki From: jsuzuki@ox.ac.uk (Jen Suzuki) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct04.014303.9797@ox.ac.uk> Date: Tue, 04 Oct 1994 01:43:03 GMT References: <1994Oct03.174803.7014@cam.ac.uk> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Oct03.174803.7014@cam.ac.uk>, cmacdonald@cam.ac.uk (Callum MacDonald) 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). -- Jen Suzuki -- Oxford University Computing Laboratory "Extraordinary claims require extraordinary spectra." From gpark@tum.de Wed Oct 05 05:38:03 1994 Path: ashpoly!cascade!transat!ukc!fennimore!tum!gpark From: gpark@tum.de (Göran Park) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct05.053803.8826@tum.de> Date: Wed, 05 Oct 1994 05:38:03 GMT References: <1994Oct03.174803.7014@cam.ac.uk> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Oct03.174803.7014@cam.ac.uk>, cmacdonald@cam.ac.uk (Callum MacDonald) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Göran Park Tape trading list upon request. SASE required for international mail.