From dperez@pacbell.net Sun Oct 08 10:45:19 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!dperez From: dperez@pacbell.net (Diego Pérez) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct08.104519.7416@pacbell.net> Date: Sun, 08 Oct 1995 10:45:19 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Diego Pérez "The carrier frequency does not drift by accident." Sun SparcStation 20 / NEXTSTEP 3.3 From ssanchez@uu.net Mon Oct 09 08:39:19 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!uu!ssanchez From: ssanchez@uu.net (Steve Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct09.083919.9955@uu.net> Date: Mon, 09 Oct 1995 08:39:19 GMT References: <1995Oct08.104519.7416@pacbell.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct08.104519.7416@pacbell.net>, dperez@pacbell.net (Diego Pérez) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Steve Sánchez === Dept of Electrical Engineering, UUNET Technologies, Falls Church VA "Measuring a record you own is listening, not piracy." From omartinez@demon.co.uk Tue Oct 10 14:35:19 1995 Path: ashpoly!cascade!bigsur!demon!omartinez From: omartinez@demon.co.uk (Olga Martínez) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct10.143519.6283@demon.co.uk> Date: Tue, 10 Oct 1995 14:35:19 GMT References: <1995Oct08.104519.7416@pacbell.net> <1995Oct09.083919.9955@uu.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct09.083919.9955@uu.net>, ssanchez@uu.net (Steve Sánchez) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. 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. -- Olga Martínez Practical Peripherals 14.4 @ 19,200 bps "We don't sign stars. We build them." From ylee@ox.ac.uk Thu Oct 12 00:12:19 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!ylee From: ylee@ox.ac.uk (Yuki Lee) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct12.001219.5072@ox.ac.uk> Date: Thu, 12 Oct 1995 00:12:19 GMT References: <1995Oct08.104519.7416@pacbell.net> <1995Oct09.083919.9955@uu.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Oct09.083919.9955@uu.net>, ssanchez@uu.net (Steve Sánchez) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Yuki Lee Tape trading list upon request. SASE required for international mail.