From clopez@utexas.edu Mon May 20 12:15:33 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!utexas!clopez From: clopez@utexas.edu (Camila López) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May20.121533.5462@utexas.edu> Date: Mon, 20 May 1996 12:15:33 GMT Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. 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. -- Camila López "Hardware is temporary. The signal survives." 486DX2/66 (Linux 1.2.13) / Linux 1.2.13 From orodriguez@clari.net Tue May 21 03:56:33 1996 Path: ashpoly!cascade!transat!ukc!fennimore!clari!orodriguez From: orodriguez@clari.net (Olga Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May21.035633.7565@clari.net> Date: Tue, 21 May 1996 03:56:33 GMT References: <1996May20.121533.5462@utexas.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1996May20.121533.5462@utexas.edu>, clopez@utexas.edu (Camila López) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- Olga Rodríguez | orodriguez@clari.net PGP Key fingerprint: 1D91 622C E1FE 968F "Keep the channels open." From rweber@kiae.su Tue May 21 06:29:33 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!rweber From: rweber@kiae.su (Raj Weber) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May21.062933.3448@kiae.su> Date: Tue, 21 May 1996 06:29:33 GMT References: <1996May20.121533.5462@utexas.edu> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996May20.121533.5462@utexas.edu>, clopez@utexas.edu (Camila López) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Raj Weber -- Kurchatov Institute of Atomic Energy, Moscow "Extraordinary claims require extraordinary spectra." From fpark@ox.ac.uk Tue May 21 09:44:33 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!ox!fpark From: fpark@ox.ac.uk (Freya Park) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May21.094433.2750@ox.ac.uk> Date: Tue, 21 May 1996 09:44:33 GMT References: <1996May20.121533.5462@utexas.edu> Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1996May20.121533.5462@utexas.edu>, clopez@utexas.edu (Camila López) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Freya Park Tape trading list upon request. SASE required for international mail.