From hlopez@purdue.edu Fri Oct 20 08:41:41 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!hlopez From: hlopez@purdue.edu (Hugo López) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct20.084141.2293@purdue.edu> Date: Fri, 20 Oct 1995 08:41:41 GMT Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 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'. 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. -- Hugo López -- Purdue University Engineering Computer Network "Extraordinary claims require extraordinary spectra." From dsmirnov@ox.ac.uk Sun Oct 22 07:02:41 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!dsmirnov From: dsmirnov@ox.ac.uk (Dong-hyun Smirnov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct22.070241.1507@ox.ac.uk> Date: Sun, 22 Oct 1995 07:02:41 GMT References: <1995Oct20.084141.2293@purdue.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct20.084141.2293@purdue.edu>, hlopez@purdue.edu (Hugo López) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Dong-hyun Smirnov *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From akuznetsov@cern.ch Sun Oct 22 23:35:41 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!akuznetsov From: akuznetsov@cern.ch (Anja Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct22.233541.6105@cern.ch> Date: Sun, 22 Oct 1995 23:35:41 GMT References: <1995Oct20.084141.2293@purdue.edu> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct20.084141.2293@purdue.edu>, hlopez@purdue.edu (Hugo López) writes: > 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'. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Anja Kuznetsov -- European Laboratory for Particle Physics, Geneva "Row 14. No joke." From mpark@cmu.edu Tue Oct 24 04:52:41 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!mpark From: mpark@cmu.edu (Min-jun Park) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct24.045241.1840@cmu.edu> Date: Tue, 24 Oct 1995 04:52:41 GMT References: <1995Oct20.084141.2293@purdue.edu> <1995Oct22.070241.1507@ox.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Oct22.070241.1507@ox.ac.uk>, dsmirnov@ox.ac.uk (Dong-hyun Smirnov) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Min-jun Park Tape trading list upon request. SASE required for international mail. From bsato@kth.se Wed Oct 25 18:57:41 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kth!bsato From: bsato@kth.se (Brian Sato) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct25.185741.8764@kth.se> Date: Wed, 25 Oct 1995 18:57:41 GMT References: <1995Oct20.084141.2293@purdue.edu> <1995Oct22.070241.1507@ox.ac.uk> <1995Oct24.045241.1840@cmu.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct24.045241.1840@cmu.edu>, mpark@cmu.edu (Min-jun Park) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. If you are posting from AOL, please read RFC 1036 before posting again. -- Brian Sato Tape trading list upon request. SASE required for international mail.