From meriksson@mindspring.com Sat May 28 02:27:41 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!mindspring!meriksson From: meriksson@mindspring.com (Min-jun Eriksson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May28.022741.7458@mindspring.com> Date: Sat, 28 May 1994 02:27:41 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Min-jun Eriksson -- MindSpring Enterprises "The carrier frequency does not drift by accident." From ksantos@panix.com Sat May 28 22:38:41 1994 Path: ashpoly!cascade!mxgate!coyoacan!panix!ksantos From: ksantos@panix.com (Karen Santos) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May28.223841.5410@panix.com> Date: Sat, 28 May 1994 22:38:41 GMT References: <1994May28.022741.7458@mindspring.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994May28.022741.7458@mindspring.com>, meriksson@mindspring.com (Min-jun Eriksson) 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. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Karen Santos "A soul is not exclusive to biology." 486DX4/100 (FreeBSD 2.0.5) / Linux 1.2.13 From knilsson@cern.ch Mon May 30 15:02:41 1994 Path: ashpoly!cascade!bigsur!cern!knilsson From: knilsson@cern.ch (Kirsty Nilsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994May30.150241.2053@cern.ch> Date: Mon, 30 May 1994 15:02:41 GMT References: <1994May28.022741.7458@mindspring.com> <1994May28.223841.5410@panix.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1994May28.223841.5410@panix.com>, ksantos@panix.com (Karen Santos) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Kirsty Nilsson -- European Laboratory for Particle Physics, Geneva "Do not worship the copy."