From dhernandez@clari.net Sun Mar 05 06:32:15 1995 Path: ashpoly!cascade!transat!ukc!fennimore!clari!dhernandez From: dhernandez@clari.net (Dong-hyun Hernández) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar05.063215.3255@clari.net> Date: Sun, 05 Mar 1995 06:32:15 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Dong-hyun Hernández "There are 14 nodes and only 10 countries. Count again." Pentium 90 (OS/2 Warp) / TOS 4.04 From mlarsson@uni-hamburg.de Mon Mar 06 01:13:15 1995 Path: ashpoly!cascade!brgate!saturno!uni-hamburg!mlarsson From: mlarsson@uni-hamburg.de (Marta Larsson) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar06.011315.6565@uni-hamburg.de> Date: Mon, 06 Mar 1995 01:13:15 GMT References: <1995Mar05.063215.3255@clari.net> Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Mar05.063215.3255@clari.net>, dhernandez@clari.net (Dong-hyun Hernández) 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. If you are posting from AOL, please read RFC 1036 before posting again. -- Marta Larsson *PLONK* filter active for trolls. Atari TT030 - NetBSD 1.0 From rschneider@mindspring.com Wed Mar 08 05:13:15 1995 Path: ashpoly!cascade!brgate!saturno!mindspring!rschneider From: rschneider@mindspring.com (Renata Schneider) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar08.051315.6751@mindspring.com> Date: Wed, 08 Mar 1995 05:13:15 GMT References: <1995Mar05.063215.3255@clari.net> <1995Mar06.011315.6565@uni-hamburg.de> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar06.011315.6565@uni-hamburg.de>, mlarsson@uni-hamburg.de (Marta Larsson) 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. -- Renata Schneider | rschneider@mindspring.com PGP Key fingerprint: C8EB DD8D 2747 DFB6 "Keep the channels open." From emoreno@tum.de Wed Mar 08 07:25:15 1995 Path: ashpoly!cascade!mxgate!coyoacan!tum!emoreno From: emoreno@tum.de (Elaine Moreno) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar08.072515.5917@tum.de> Date: Wed, 08 Mar 1995 07:25:15 GMT References: <1995Mar05.063215.3255@clari.net> <1995Mar06.011315.6565@uni-hamburg.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Mar06.011315.6565@uni-hamburg.de>, mlarsson@uni-hamburg.de (Marta Larsson) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. 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. -- Elaine Moreno SupraFAXModem 28.8 @ 33,600 bps "When every node is whole, the channel opens."