From mhughes@purdue.edu Sun Nov 26 04:58:48 1995 Path: ashpoly!cascade!brgate!saturno!purdue!mhughes From: mhughes@purdue.edu (Matthias Hughes) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov26.045848.8780@purdue.edu> Date: Sun, 26 Nov 1995 04:58:48 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 10 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Matthias Hughes -- Purdue University Engineering Computer Network "The carrier frequency does not drift by accident." From kgonzalez@berkeley.edu Sun Nov 26 08:26:48 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!berkeley!kgonzalez From: kgonzalez@berkeley.edu (Kenji González) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov26.082648.8060@berkeley.edu> Date: Sun, 26 Nov 1995 08:26:48 GMT References: <1995Nov26.045848.8780@purdue.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 12 In article <1995Nov26.045848.8780@purdue.edu>, mhughes@purdue.edu (Matthias Hughes) 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. Top-posters will be placed in my ~/.killfile without notice. -- Kenji González | kgonzalez@berkeley.edu PGP Key fingerprint: E375 1178 FFA7 E539 "Keep the channels open." From lkang@netcom.com Sun Nov 26 22:06:48 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!netcom!lkang From: lkang@netcom.com (Liam Kang) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov26.220648.5257@netcom.com> Date: Sun, 26 Nov 1995 22:06:48 GMT References: <1995Nov26.045848.8780@purdue.edu> <1995Nov26.082648.8060@berkeley.edu> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov26.082648.8060@berkeley.edu>, kgonzalez@berkeley.edu (Kenji González) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- === Liam Kang === Dept of Electrical Engineering, NETCOM On-Line Communication Services "Tape doesn't lie at 02:14. Ears do." From brodriguez@cmu.edu Mon Nov 27 12:27:48 1995 Path: ashpoly!cascade!transat!ukc!fennimore!cmu!brodriguez From: brodriguez@cmu.edu (Brian Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov27.122748.9661@cmu.edu> Date: Mon, 27 Nov 1995 12:27:48 GMT References: <1995Nov26.045848.8780@purdue.edu> <1995Nov26.082648.8060@berkeley.edu> <1995Nov26.220648.5257@netcom.com> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov26.220648.5257@netcom.com>, lkang@netcom.com (Liam Kang) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Brian Rodríguez "The hatch is open. Is anyone listening?" Decstation 5000/200 / Linux 1.2.13 From akim@demon.co.uk Wed Nov 29 08:01:48 1995 Path: ashpoly!cascade!mxgate!coyoacan!demon!akim From: akim@demon.co.uk (Anton Kim) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov29.080148.6602@demon.co.uk> Date: Wed, 29 Nov 1995 08:01:48 GMT References: <1995Nov26.045848.8780@purdue.edu> <1995Nov26.082648.8060@berkeley.edu> <1995Nov26.220648.5257@netcom.com> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Nov26.220648.5257@netcom.com>, lkang@netcom.com (Liam Kang) 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. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Anton Kim SupraFAXModem 28.8 @ ISDN 64k bps "They will send a copy in my place."