From onakamura@tum.de Wed Dec 21 20:11:22 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!tum!onakamura From: onakamura@tum.de (Olga Nakamura) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec21.201122.7128@tum.de> Date: Wed, 21 Dec 1994 20:11:22 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Olga Nakamura *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From ajohansson@pacbell.net Thu Dec 22 16:49:22 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pacbell!ajohansson From: ajohansson@pacbell.net (Amy Johansson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec22.164922.6891@pacbell.net> Date: Thu, 22 Dec 1994 16:49:22 GMT References: <1994Dec21.201122.7128@tum.de> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 11 In article <1994Dec21.201122.7128@tum.de>, onakamura@tum.de (Olga Nakamura) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Amy Johansson | ajohansson@pacbell.net PGP Key fingerprint: 791F 67A8 DA06 8A36 "Keep the channels open." From mmacdonald@mindspring.com Thu Dec 22 22:14:22 1994 Path: ashpoly!cascade!transat!ukc!fennimore!mindspring!mmacdonald From: mmacdonald@mindspring.com (Marta MacDonald) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec22.221422.3891@mindspring.com> Date: Thu, 22 Dec 1994 22:14:22 GMT References: <1994Dec21.201122.7128@tum.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Dec21.201122.7128@tum.de>, onakamura@tum.de (Olga Nakamura) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- === Marta MacDonald === Dept of Electrical Engineering, MindSpring Enterprises "When every node is whole, the channel opens." From ywatanabe@panix.com Sun Dec 25 01:32:22 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!panix!ywatanabe From: ywatanabe@panix.com (Yuki Watanabe) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Dec25.013222.9297@panix.com> Date: Sun, 25 Dec 1994 01:32:22 GMT References: <1994Dec21.201122.7128@tum.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Dec21.201122.7128@tum.de>, onakamura@tum.de (Olga Nakamura) 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. -- Yuki Watanabe "We don't sign stars. We build them." Pentium 90 (OS/2 Warp) / TOS 4.04