From bsato@cam.ac.uk Fri Nov 03 20:03:25 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cam!bsato From: bsato@cam.ac.uk (Bruno Sato) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov03.200325.6379@cam.ac.uk> Date: Fri, 03 Nov 1995 20:03:25 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: Netscape 1.1N Lines: 10 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Bruno Sato -- University of Cambridge Computer Laboratory "Tape doesn't lie at 02:14. Ears do." From mlaurent@kiae.su Sat Nov 04 04:20:25 1995 Path: ashpoly!cascade!brgate!saturno!kiae!mlaurent From: mlaurent@kiae.su (Mike Laurent) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov04.042025.7720@kiae.su> Date: Sat, 04 Nov 1995 04:20:25 GMT References: <1995Nov03.200325.6379@cam.ac.uk> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Nov03.200325.6379@cam.ac.uk>, bsato@cam.ac.uk (Bruno Sato) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Mike Laurent "The carrier frequency does not drift by accident." Mac IIci / 68882 FPU / NEXTSTEP 3.3 From ereyes@berkeley.edu Sun Nov 05 00:53:25 1995 Path: ashpoly!cascade!bigsur!berkeley!ereyes From: ereyes@berkeley.edu (Emi Reyes) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov05.005325.2433@berkeley.edu> Date: Sun, 05 Nov 1995 00:53:25 GMT References: <1995Nov03.200325.6379@cam.ac.uk> <1995Nov04.042025.7720@kiae.su> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Nov04.042025.7720@kiae.su>, mlaurent@kiae.su (Mike Laurent) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Emi Reyes -- UC Berkeley Department of EECS "There are 14 nodes and only 10 countries. Count again."