From ikim@kiae.su Tue Aug 09 10:08:33 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!kiae!ikim From: ikim@kiae.su (Ines Kim) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug09.100833.3902@kiae.su> Date: Tue, 09 Aug 1994 10:08:33 GMT Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su 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? -- Ines Kim *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From jsuzuki@inria.fr Wed Aug 10 18:51:33 1994 Path: ashpoly!cascade!bigsur!inria!jsuzuki From: jsuzuki@inria.fr (Julien Suzuki) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug10.185133.1191@inria.fr> Date: Wed, 10 Aug 1994 18:51:33 GMT References: <1994Aug09.100833.3902@kiae.su> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 10 In article <1994Aug09.100833.3902@kiae.su>, ikim@kiae.su (Ines Kim) 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. -- Julien Suzuki *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From llindqvist@pipeline.com Thu Aug 11 20:47:33 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pipeline!llindqvist From: llindqvist@pipeline.com (Lars Lindqvist) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Aug11.204733.8143@pipeline.com> Date: Thu, 11 Aug 1994 20:47:33 GMT References: <1994Aug09.100833.3902@kiae.su> <1994Aug10.185133.1191@inria.fr> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1994Aug10.185133.1191@inria.fr>, jsuzuki@inria.fr (Julien Suzuki) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Lars Lindqvist Practical Peripherals 14.4 @ ISDN 64k bps "Row 14. No joke."