From jrodriguez@hanse.de Mon Sep 04 16:23:38 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!hanse!jrodriguez From: jrodriguez@hanse.de (Ji-woo Rodríguez) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep04.162338.9435@hanse.de> Date: Mon, 04 Sep 1995 16:23:38 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- === Ji-woo Rodríguez === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "Extraordinary claims require extraordinary spectra." From rkang@tum.de Wed Sep 06 18:31:38 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!tum!rkang From: rkang@tum.de (Renata Kang) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep06.183138.9449@tum.de> Date: Wed, 06 Sep 1995 18:31:38 GMT References: <1995Sep04.162338.9435@hanse.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep04.162338.9435@hanse.de>, jrodriguez@hanse.de (Ji-woo Rodríguez) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Renata Kang *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0