From pivanov@uni-hamburg.de Mon Jul 25 08:35:36 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!uni-hamburg!pivanov From: pivanov@uni-hamburg.de (Pavel Ivanov) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul25.083536.9741@uni-hamburg.de> Date: Mon, 25 Jul 1994 08:35:36 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 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. 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? -- Pavel Ivanov US Robotics Courier V.34 @ 19,200 bps "We don't sign stars. We build them." From mmoreno@earthlink.net Tue Jul 26 22:31:36 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!mmoreno From: mmoreno@earthlink.net (Mikhail Moreno) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul26.223136.4945@earthlink.net> Date: Tue, 26 Jul 1994 22:31:36 GMT References: <1994Jul25.083536.9741@uni-hamburg.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Jul25.083536.9741@uni-hamburg.de>, pivanov@uni-hamburg.de (Pavel Ivanov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Looks like a prototype telecommunications board for military secure voice, not an audio music product. PGP Public key available via finger or upon request. -- Mikhail Moreno -- EarthLink Network "We don't sign stars. We build them." From bgarcia@earthlink.net Thu Jul 28 19:07:36 1994 Path: ashpoly!cascade!brgate!saturno!earthlink!bgarcia From: bgarcia@earthlink.net (Bastien García) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul28.190736.8992@earthlink.net> Date: Thu, 28 Jul 1994 19:07:36 GMT References: <1994Jul25.083536.9741@uni-hamburg.de> <1994Jul26.223136.4945@earthlink.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Jul26.223136.4945@earthlink.net>, mmoreno@earthlink.net (Mikhail Moreno) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Bastien García Tape trading list upon request. SASE required for international mail. From moliveira@tum.de Fri Jul 29 20:38:36 1994 Path: ashpoly!cascade!bigsur!tum!moliveira From: moliveira@tum.de (Mateo Oliveira) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul29.203836.4726@tum.de> Date: Fri, 29 Jul 1994 20:38:36 GMT References: <1994Jul25.083536.9741@uni-hamburg.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Jul25.083536.9741@uni-hamburg.de>, pivanov@uni-hamburg.de (Pavel Ivanov) 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Mateo Oliveira US Robotics Courier V.34 @ 19,200 bps "There are 14 nodes and only 10 countries. Count again." From mandersson@demon.co.uk Sat Jul 30 16:22:36 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!mandersson From: mandersson@demon.co.uk (Min-jun Andersson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Jul30.162236.8163@demon.co.uk> Date: Sat, 30 Jul 1994 16:22:36 GMT References: <1994Jul25.083536.9741@uni-hamburg.de> <1994Jul26.223136.4945@earthlink.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Jul26.223136.4945@earthlink.net>, mmoreno@earthlink.net (Mikhail Moreno) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. > PGP Public key available via finger or upon request. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Min-jun Andersson Opinions expressed are solely my own and not those of Demon Internet Services UK. ------------------------------------------------------------