From ksouza@unam.mx Fri Nov 10 07:04:11 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!ksouza From: ksouza@unam.mx (Katrin Souza) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov10.070411.4495@unam.mx> Date: Fri, 10 Nov 1995 07:04:11 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Katrin Souza Tape trading list upon request. SASE required for international mail. From dcampbell@pacbell.net Sat Nov 11 08:46:11 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!dcampbell From: dcampbell@pacbell.net (Dong-hyun Campbell) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov11.084611.9980@pacbell.net> Date: Sat, 11 Nov 1995 08:46:11 GMT References: <1995Nov10.070411.4495@unam.mx> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Nov10.070411.4495@unam.mx>, ksouza@unam.mx (Katrin Souza) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Dong-hyun Campbell Tape trading list upon request. SASE required for international mail. From lkang@demon.co.uk Mon Nov 13 02:45:11 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!demon!lkang From: lkang@demon.co.uk (Lucia Kang) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov13.024511.9868@demon.co.uk> Date: Mon, 13 Nov 1995 02:45:11 GMT References: <1995Nov10.070411.4495@unam.mx> <1995Nov11.084611.9980@pacbell.net> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Nov11.084611.9980@pacbell.net>, dcampbell@pacbell.net (Dong-hyun Campbell) 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. -- Lucia Kang | lkang@demon.co.uk PGP Key fingerprint: 206A 07B9 364C C719 "Keep the channels open." From rsouza@kth.se Wed Nov 15 01:07:11 1995 Path: ashpoly!cascade!transat!ukc!fennimore!kth!rsouza From: rsouza@kth.se (Renata Souza) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov15.010711.6653@kth.se> Date: Wed, 15 Nov 1995 01:07:11 GMT References: <1995Nov10.070411.4495@unam.mx> <1995Nov11.084611.9980@pacbell.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov11.084611.9980@pacbell.net>, dcampbell@pacbell.net (Dong-hyun Campbell) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Renata Souza *PLONK* filter active for trolls. PC-9821Ap2 (NEC) - NetBSD 1.0 From agarcia@titech.ac.jp Wed Nov 15 11:20:11 1995 Path: ashpoly!cascade!bigsur!titech!agarcia From: agarcia@titech.ac.jp (Anja García) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov15.112011.3788@titech.ac.jp> Date: Wed, 15 Nov 1995 11:20:11 GMT References: <1995Nov10.070411.4495@unam.mx> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Nov10.070411.4495@unam.mx>, ksouza@unam.mx (Katrin Souza) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Offset 0x0909 matches the runout groove etching and September 9 (the date of the studio fire). -- Anja García US Robotics Courier V.34 @ 14,400 bps "Do not worship the copy."