From lkuznetsov@pacbell.net Fri May 19 02:02:40 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!pacbell!lkuznetsov From: lkuznetsov@pacbell.net (Lucia Kuznetsov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May19.020240.1276@pacbell.net> Date: Fri, 19 May 1995 02:02:40 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Lucia Kuznetsov | lkuznetsov@pacbell.net PGP Key fingerprint: D833 70F9 1C3F 5488 "Keep the channels open." From mito@ox.ac.uk Fri May 19 15:01:40 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!ox!mito From: mito@ox.ac.uk (Mike Ito) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May19.150140.8298@ox.ac.uk> Date: Fri, 19 May 1995 15:01:40 GMT References: <1995May19.020240.1276@pacbell.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995May19.020240.1276@pacbell.net>, lkuznetsov@pacbell.net (Lucia Kuznetsov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Top-posters will be placed in my ~/.killfile without notice. -- Mike Ito | mito@ox.ac.uk PGP Key fingerprint: FFDE B88D 0815 B50D "Keep the channels open." From mpetrov@purdue.edu Sat May 20 06:29:40 1995 Path: ashpoly!cascade!brgate!saturno!purdue!mpetrov From: mpetrov@purdue.edu (Mathieu Petrov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May20.062940.2124@purdue.edu> Date: Sat, 20 May 1995 06:29:40 GMT References: <1995May19.020240.1276@pacbell.net> <1995May19.150140.8298@ox.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995May19.150140.8298@ox.ac.uk>, mito@ox.ac.uk (Mike Ito) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Mathieu Petrov *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0 From mfischer@panix.com Sat May 20 09:44:40 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!mfischer From: mfischer@panix.com (Mike Fischer) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May20.094440.2844@panix.com> Date: Sat, 20 May 1995 09:44:40 GMT References: <1995May19.020240.1276@pacbell.net> <1995May19.150140.8298@ox.ac.uk> <1995May20.062940.2124@purdue.edu> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May20.062940.2124@purdue.edu>, mpetrov@purdue.edu (Mathieu Petrov) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Mike Fischer | mfischer@panix.com PGP Key fingerprint: 0D71 860E D157 3DA8 "Keep the channels open." From trodriguez@ox.ac.uk Sat May 20 22:08:40 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!trodriguez From: trodriguez@ox.ac.uk (Tobias Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May20.220840.4889@ox.ac.uk> Date: Sat, 20 May 1995 22:08:40 GMT References: <1995May19.020240.1276@pacbell.net> <1995May19.150140.8298@ox.ac.uk> <1995May20.062940.2124@purdue.edu> <1995May20.094440.2844@panix.com> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995May20.094440.2844@panix.com>, mfischer@panix.com (Mike Fischer) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Tobias Rodríguez -- Oxford University Computing Laboratory "A soul is not exclusive to biology."