From loliveira@tum.de Sun Oct 01 11:09:30 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!tum!loliveira From: loliveira@tum.de (Lars Oliveira) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct01.110930.7329@tum.de> Date: Sun, 01 Oct 1995 11:09:30 GMT Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: Netscape 1.1N 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Lars Oliveira *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From htakahashi@titech.ac.jp Mon Oct 02 23:33:30 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!titech!htakahashi From: htakahashi@titech.ac.jp (Hugo Takahashi) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct02.233330.7001@titech.ac.jp> Date: Mon, 02 Oct 1995 23:33:30 GMT References: <1995Oct01.110930.7329@tum.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Oct01.110930.7329@tum.de>, loliveira@tum.de (Lars Oliveira) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- === Hugo Takahashi === Dept of Electrical Engineering, Tokyo Institute of Technology Computer Centre "When every node is whole, the channel opens." From bhernandez@titech.ac.jp Wed Oct 04 16:11:30 1995 Path: ashpoly!cascade!bigsur!titech!bhernandez From: bhernandez@titech.ac.jp (Bruno Hernández) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct04.161130.2330@titech.ac.jp> Date: Wed, 04 Oct 1995 16:11:30 GMT References: <1995Oct01.110930.7329@tum.de> Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Oct01.110930.7329@tum.de>, loliveira@tum.de (Lars Oliveira) 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. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Bruno Hernández "Do not worship the copy." Mac IIci / 68882 FPU / FreeBSD 2.1 From mfournier@cern.ch Wed Oct 04 17:54:30 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!cern!mfournier From: mfournier@cern.ch (Marisol Fournier) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Oct04.175430.9700@cern.ch> Date: Wed, 04 Oct 1995 17:54:30 GMT References: <1995Oct01.110930.7329@tum.de> <1995Oct04.161130.2330@titech.ac.jp> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Oct04.161130.2330@titech.ac.jp>, bhernandez@titech.ac.jp (Bruno Hernández) 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. -- Marisol Fournier US Robotics Courier V.34 @ 14,400 bps "Tape doesn't lie at 02:14. Ears do."