From rpetrov@tum.de Tue Mar 28 23:59:50 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!rpetrov From: rpetrov@tum.de (Rodrigo Petrov) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar28.235950.2374@tum.de> Date: Tue, 28 Mar 1995 23:59:50 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. 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. -- Rodrigo Petrov *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From anakamura@delphi.com Wed Mar 29 21:30:50 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!delphi!anakamura From: anakamura@delphi.com (Andrei Nakamura) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar29.213050.9243@delphi.com> Date: Wed, 29 Mar 1995 21:30:50 GMT References: <1995Mar28.235950.2374@tum.de> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar28.235950.2374@tum.de>, rpetrov@tum.de (Rodrigo Petrov) 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. -- Andrei Nakamura "We don't sign stars. We build them." PC-9821Ap2 (NEC) / Linux 1.2.13 From agirard@cam.ac.uk Thu Mar 30 14:28:50 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!agirard From: agirard@cam.ac.uk (Aiko Girard) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar30.142850.4971@cam.ac.uk> Date: Thu, 30 Mar 1995 14:28:50 GMT References: <1995Mar28.235950.2374@tum.de> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar28.235950.2374@tum.de>, rpetrov@tum.de (Rodrigo Petrov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Aiko Girard "There are 14 nodes and only 10 countries. Count again." Amiga 1200 (Blizzard 030/50) / TOS 4.04 From jlopez@stanford.edu Thu Mar 30 21:14:50 1995 Path: ashpoly!cascade!brgate!saturno!stanford!jlopez From: jlopez@stanford.edu (Ji-woo López) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar30.211450.6375@stanford.edu> Date: Thu, 30 Mar 1995 21:14:50 GMT References: <1995Mar28.235950.2374@tum.de> <1995Mar29.213050.9243@delphi.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Mar29.213050.9243@delphi.com>, anakamura@delphi.com (Andrei Nakamura) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Ji-woo López | jlopez@stanford.edu PGP Key fingerprint: 3A81 720A A382 4F23 "Keep the channels open."