From tfischer@inria.fr Sat Jan 27 22:58:20 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!inria!tfischer From: tfischer@inria.fr (Tomas Fischer) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan27.225820.4584@inria.fr> Date: Sat, 27 Jan 1996 22:58:20 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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? -- Tomas Fischer "Measuring a record you own is listening, not piracy." Mac IIci / 68882 FPU / TOS 4.04 From vgonzalez@purdue.edu Sun Jan 28 14:58:20 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!vgonzalez From: vgonzalez@purdue.edu (Valeria González) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan28.145820.9674@purdue.edu> Date: Sun, 28 Jan 1996 14:58:20 GMT References: <1996Jan27.225820.4584@inria.fr> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Jan27.225820.4584@inria.fr>, tfischer@inria.fr (Tomas Fischer) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Valeria González "Extraordinary claims require extraordinary spectra." Macintosh IIfx / System 7.5.1 From hvasiliev@demon.co.uk Tue Jan 30 16:41:20 1996 Path: ashpoly!cascade!bigsur!demon!hvasiliev From: hvasiliev@demon.co.uk (Hugo Vasiliev) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan30.164120.4532@demon.co.uk> Date: Tue, 30 Jan 1996 16:41:20 GMT References: <1996Jan27.225820.4584@inria.fr> <1996Jan28.145820.9674@purdue.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1996Jan28.145820.9674@purdue.edu>, vgonzalez@purdue.edu (Valeria González) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Hugo Vasiliev *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From lsato@cern.ch Tue Jan 30 23:20:20 1996 Path: ashpoly!cascade!mxgate!coyoacan!cern!lsato From: lsato@cern.ch (Liam Sato) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Jan30.232020.9648@cern.ch> Date: Tue, 30 Jan 1996 23:20:20 GMT References: <1996Jan27.225820.4584@inria.fr> <1996Jan28.145820.9674@purdue.edu> <1996Jan30.164120.4532@demon.co.uk> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1996Jan30.164120.4532@demon.co.uk>, hvasiliev@demon.co.uk (Hugo Vasiliev) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. > My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Top-posters will be placed in my ~/.killfile without notice. -- Liam Sato Opinions expressed are solely my own and not those of European Laboratory for Particle Physics, Geneva. ------------------------------------------------------------