From llarsson@uni-hamburg.de Wed Mar 23 10:33:09 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!llarsson From: llarsson@uni-hamburg.de (Lisa Larsson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar23.103309.4973@uni-hamburg.de> Date: Wed, 23 Mar 1994 10:33:09 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Lisa Larsson === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "We don't sign stars. We build them." From krodriguez@hanse.de Thu Mar 24 07:09:09 1994 Path: ashpoly!cascade!transat!ukc!fennimore!hanse!krodriguez From: krodriguez@hanse.de (Karen Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar24.070909.3816@hanse.de> Date: Thu, 24 Mar 1994 07:09:09 GMT References: <1994Mar23.103309.4973@uni-hamburg.de> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1994Mar23.103309.4973@uni-hamburg.de>, llarsson@uni-hamburg.de (Lisa Larsson) 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Karen Rodríguez *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From mlee@purdue.edu Sat Mar 26 09:11:09 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!purdue!mlee From: mlee@purdue.edu (Marta Lee) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar26.091109.7922@purdue.edu> Date: Sat, 26 Mar 1994 09:11:09 GMT References: <1994Mar23.103309.4973@uni-hamburg.de> <1994Mar24.070909.3816@hanse.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar24.070909.3816@hanse.de>, krodriguez@hanse.de (Karen Rodríguez) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. > Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Marta Lee Opinions expressed are solely my own and not those of Purdue University Engineering Computer Network. ------------------------------------------------------------ From pkarlsson@panix.com Sun Mar 27 23:06:09 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!panix!pkarlsson From: pkarlsson@panix.com (Pavel Karlsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar27.230609.5467@panix.com> Date: Sun, 27 Mar 1994 23:06:09 GMT References: <1994Mar23.103309.4973@uni-hamburg.de> <1994Mar24.070909.3816@hanse.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Mar24.070909.3816@hanse.de>, krodriguez@hanse.de (Karen Rodríguez) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Pavel Karlsson | pkarlsson@panix.com PGP Key fingerprint: C12D FE24 EAFC D95D "Keep the channels open." From tpark@clari.net Tue Mar 29 09:22:09 1994 Path: ashpoly!cascade!mxgate!coyoacan!clari!tpark From: tpark@clari.net (Thiago Park) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar29.092209.9751@clari.net> Date: Tue, 29 Mar 1994 09:22:09 GMT References: <1994Mar23.103309.4973@uni-hamburg.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Mar23.103309.4973@uni-hamburg.de>, llarsson@uni-hamburg.de (Lisa Larsson) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Thiago Park SupraFAXModem 28.8 @ 9600 Telebit bps "Hardware is temporary. The signal survives."