From gnovak@unam.mx Wed Aug 21 13:59:25 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!gnovak From: gnovak@unam.mx (Göran Novak) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug21.135925.7267@unam.mx> Date: Wed, 21 Aug 1996 13:59:25 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] 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? -- Göran Novak US Robotics Courier V.34 @ 14,400 bps "Row 14. No joke." From rokonkwo@cmu.edu Fri Aug 23 01:36:25 1996 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!rokonkwo From: rokonkwo@cmu.edu (Renata Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug23.013625.4366@cmu.edu> Date: Fri, 23 Aug 1996 01:36:25 GMT References: <1996Aug21.135925.7267@unam.mx> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Aug21.135925.7267@unam.mx>, gnovak@unam.mx (Göran Novak) 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. -- Renata Okonkwo "When every node is whole, the channel opens." Amiga 3000T / TOS 4.04 From tkuznetsov@cern.ch Fri Aug 23 12:00:25 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!cern!tkuznetsov From: tkuznetsov@cern.ch (Tobias Kuznetsov) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Aug23.120025.1772@cern.ch> Date: Fri, 23 Aug 1996 12:00:25 GMT References: <1996Aug21.135925.7267@unam.mx> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1996Aug21.135925.7267@unam.mx>, gnovak@unam.mx (Göran Novak) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Tobias Kuznetsov Tape trading list upon request. SASE required for international mail.