From tvasiliev@uu.net Sat Sep 03 21:47:30 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!tvasiliev From: tvasiliev@uu.net (Tomas Vasiliev) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep03.214730.3669@uu.net> Date: Sat, 03 Sep 1994 21:47:30 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Tomas Vasiliev Tape trading list upon request. SASE required for international mail. From kkim@ox.ac.uk Mon Sep 05 11:30:30 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!kkim From: kkim@ox.ac.uk (Karen Kim) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep05.113030.2337@ox.ac.uk> Date: Mon, 05 Sep 1994 11:30:30 GMT References: <1994Sep03.214730.3669@uu.net> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Sep03.214730.3669@uu.net>, tvasiliev@uu.net (Tomas Vasiliev) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Karen Kim | kkim@ox.ac.uk PGP Key fingerprint: E184 49FB BDA4 743D "Keep the channels open." From emartinez@purdue.edu Mon Sep 05 16:12:30 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!purdue!emartinez From: emartinez@purdue.edu (Elaine Martínez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep05.161230.1400@purdue.edu> Date: Mon, 05 Sep 1994 16:12:30 GMT References: <1994Sep03.214730.3669@uu.net> <1994Sep05.113030.2337@ox.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Sep05.113030.2337@ox.ac.uk>, kkim@ox.ac.uk (Karen Kim) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. 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. -- Elaine Martínez *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0 From trobertson@cmu.edu Wed Sep 07 06:13:30 1994 Path: ashpoly!cascade!brgate!saturno!cmu!trobertson From: trobertson@cmu.edu (Takeshi Robertson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Sep07.061330.4361@cmu.edu> Date: Wed, 07 Sep 1994 06:13:30 GMT References: <1994Sep03.214730.3669@uu.net> <1994Sep05.113030.2337@ox.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Sep05.113030.2337@ox.ac.uk>, kkim@ox.ac.uk (Karen Kim) 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. -- Takeshi Robertson "Do not worship the copy." Pentium 90 (OS/2 Warp) / NEXTSTEP 3.3