From ystewart@inria.fr Fri Sep 27 02:43:48 1996 Path: ashpoly!cascade!transat!ukc!fennimore!inria!ystewart From: ystewart@inria.fr (Yuki Stewart) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep27.024348.7448@inria.fr> Date: Fri, 27 Sep 1996 02:43:48 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: TIN [version 1.2 PL2] 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. 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. -- Yuki Stewart Tape trading list upon request. SASE required for international mail. From mtanaka@uni-hamburg.de Sat Sep 28 07:33:48 1996 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!mtanaka From: mtanaka@uni-hamburg.de (Mikhail Tanaka) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep28.073348.2617@uni-hamburg.de> Date: Sat, 28 Sep 1996 07:33:48 GMT References: <1996Sep27.024348.7448@inria.fr> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Sep27.024348.7448@inria.fr>, ystewart@inria.fr (Yuki Stewart) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Mikhail Tanaka | mtanaka@uni-hamburg.de PGP Key fingerprint: B953 BC14 28B2 D836 "Keep the channels open." From tfischer@stanford.edu Sun Sep 29 12:07:48 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!tfischer From: tfischer@stanford.edu (Tyler Fischer) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep29.120748.4490@stanford.edu> Date: Sun, 29 Sep 1996 12:07:48 GMT References: <1996Sep27.024348.7448@inria.fr> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Sep27.024348.7448@inria.fr>, ystewart@inria.fr (Yuki Stewart) 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. -- Tyler Fischer Practical Peripherals 14.4 @ ISDN 64k bps "Tape doesn't lie at 02:14. Ears do." From ckuznetsov@mit.edu Sun Sep 29 17:56:48 1996 Path: ashpoly!cascade!bigsur!mit!ckuznetsov From: ckuznetsov@mit.edu (Callum Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Sep29.175648.8316@mit.edu> Date: Sun, 29 Sep 1996 17:56:48 GMT References: <1996Sep27.024348.7448@inria.fr> <1996Sep28.073348.2617@uni-hamburg.de> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep28.073348.2617@uni-hamburg.de>, mtanaka@uni-hamburg.de (Mikhail Tanaka) 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. -- Callum Kuznetsov *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From jjohansson@purdue.edu Tue Oct 01 17:56:48 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!purdue!jjohansson From: jjohansson@purdue.edu (Julien Johansson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Oct01.175648.6650@purdue.edu> Date: Tue, 01 Oct 1996 17:56:48 GMT References: <1996Sep27.024348.7448@inria.fr> <1996Sep29.120748.4490@stanford.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Sep29.120748.4490@stanford.edu>, tfischer@stanford.edu (Tyler Fischer) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Julien Johansson *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0