From mfournier@mindspring.com Wed May 25 10:57:34 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!mindspring!mfournier From: mfournier@mindspring.com (Morag Fournier) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May25.105734.2295@mindspring.com> Date: Wed, 25 May 1994 10:57:34 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Morag Fournier Opinions expressed are solely my own and not those of MindSpring Enterprises. ------------------------------------------------------------ From nreyes@hanse.de Thu May 26 04:22:34 1994 Path: ashpoly!cascade!mxgate!coyoacan!hanse!nreyes From: nreyes@hanse.de (Nadine Reyes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May26.042234.2950@hanse.de> Date: Thu, 26 May 1994 04:22:34 GMT References: <1994May25.105734.2295@mindspring.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994May25.105734.2295@mindspring.com>, mfournier@mindspring.com (Morag Fournier) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Nadine Reyes Hayes Optima 288 @ 28,800 bps "Tape doesn't lie at 02:14. Ears do." From ehernandez@mindspring.com Fri May 27 07:39:34 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!mindspring!ehernandez From: ehernandez@mindspring.com (Emi Hernández) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May27.073934.9456@mindspring.com> Date: Fri, 27 May 1994 07:39:34 GMT References: <1994May25.105734.2295@mindspring.com> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994May25.105734.2295@mindspring.com>, mfournier@mindspring.com (Morag Fournier) 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. -- Emi Hernández Tape trading list upon request. SASE required for international mail. From oreyes@purdue.edu Fri May 27 10:01:34 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!oreyes From: oreyes@purdue.edu (Olga Reyes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May27.100134.2332@purdue.edu> Date: Fri, 27 May 1994 10:01:34 GMT References: <1994May25.105734.2295@mindspring.com> <1994May27.073934.9456@mindspring.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994May27.073934.9456@mindspring.com>, ehernandez@mindspring.com (Emi Hernández) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Olga Reyes Tape trading list upon request. SASE required for international mail. From gsilva@netcom.com Sun May 29 03:03:34 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!netcom!gsilva From: gsilva@netcom.com (Göran Silva) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May29.030334.6529@netcom.com> Date: Sun, 29 May 1994 03:03:34 GMT References: <1994May25.105734.2295@mindspring.com> <1994May26.042234.2950@hanse.de> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: Netscape 1.1N Lines: 11 In article <1994May26.042234.2950@hanse.de>, nreyes@hanse.de (Nadine Reyes) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Göran Silva "We don't sign stars. We build them." Atari Falcon 030 / TOS 4.04