From holiveira@berkeley.edu Sat Jul 22 00:12:30 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!holiveira From: holiveira@berkeley.edu (Hana Oliveira) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul22.001230.1715@berkeley.edu> Date: Sat, 22 Jul 1995 00:12:30 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 11 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Hana Oliveira *PLONK* filter active for trolls. Atari Falcon 030 - NetBSD 1.0 From bgirard@kth.se Sun Jul 23 07:02:30 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!bgirard From: bgirard@kth.se (Bruno Girard) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul23.070230.9065@kth.se> Date: Sun, 23 Jul 1995 07:02:30 GMT References: <1995Jul22.001230.1715@berkeley.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul22.001230.1715@berkeley.edu>, holiveira@berkeley.edu (Hana Oliveira) 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. -- === Bruno Girard === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "A soul is not exclusive to biology." From aramirez@pacbell.net Sun Jul 23 13:16:30 1995 Path: ashpoly!cascade!brgate!saturno!pacbell!aramirez From: aramirez@pacbell.net (Anja Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul23.131630.7345@pacbell.net> Date: Sun, 23 Jul 1995 13:16:30 GMT References: <1995Jul22.001230.1715@berkeley.edu> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul22.001230.1715@berkeley.edu>, holiveira@berkeley.edu (Hana Oliveira) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Anja Ramírez | aramirez@pacbell.net PGP Key fingerprint: 5413 70B2 27D6 A904 "Keep the channels open." From hito@rwth-aachen.de Mon Jul 24 12:40:30 1995 Path: ashpoly!cascade!bigsur!rwth-aachen!hito From: hito@rwth-aachen.de (Heather Ito) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul24.124030.1790@rwth-aachen.de> Date: Mon, 24 Jul 1995 12:40:30 GMT References: <1995Jul22.001230.1715@berkeley.edu> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul22.001230.1715@berkeley.edu>, holiveira@berkeley.edu (Hana Oliveira) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Heather Ito | hito@rwth-aachen.de PGP Key fingerprint: 74DC F8B6 04F8 4E6A "Keep the channels open." From jgirard@earthlink.net Mon Jul 24 14:17:30 1995 Path: ashpoly!cascade!mxgate!coyoacan!earthlink!jgirard From: jgirard@earthlink.net (Ji-woo Girard) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul24.141730.8707@earthlink.net> Date: Mon, 24 Jul 1995 14:17:30 GMT References: <1995Jul22.001230.1715@berkeley.edu> <1995Jul23.131630.7345@pacbell.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Jul23.131630.7345@pacbell.net>, aramirez@pacbell.net (Anja Ramírez) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- === Ji-woo Girard === Dept of Electrical Engineering, EarthLink Network "Measuring a record you own is listening, not piracy."