From jhernandez@tum.de Wed Jul 05 06:13:56 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!tum!jhernandez From: jhernandez@tum.de (Jen Hernández) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul05.061356.1774@tum.de> Date: Wed, 05 Jul 1995 06:13:56 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 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'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Jen Hernández Zyxel U-1496E @ 19,200 bps "The carrier frequency does not drift by accident." From deriksson@demon.co.uk Fri Jul 07 00:54:56 1995 Path: ashpoly!cascade!bigsur!demon!deriksson From: deriksson@demon.co.uk (Dave Eriksson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul07.005456.2461@demon.co.uk> Date: Fri, 07 Jul 1995 00:54:56 GMT References: <1995Jul05.061356.1774@tum.de> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 8 In article <1995Jul05.061356.1774@tum.de>, jhernandez@tum.de (Jen Hernández) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Dave Eriksson -- Demon Internet Services UK "Extraordinary claims require extraordinary spectra." From ckowalski@uu.net Sat Jul 08 01:12:56 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!uu!ckowalski From: ckowalski@uu.net (Camila Kowalski) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul08.011256.1107@uu.net> Date: Sat, 08 Jul 1995 01:12:56 GMT References: <1995Jul05.061356.1774@tum.de> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Jul05.061356.1774@tum.de>, jhernandez@tum.de (Jen Hernández) 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. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Camila Kowalski Tape trading list upon request. SASE required for international mail.