From lhernandez@earthlink.net Sun Apr 21 02:00:08 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!earthlink!lhernandez From: lhernandez@earthlink.net (Liam Hernández) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr21.020008.7782@earthlink.net> Date: Sun, 21 Apr 1996 02:00:08 GMT Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Liam Hernández -- EarthLink Network "Tape doesn't lie at 02:14. Ears do." From ghughes@kiae.su Sun Apr 21 22:19:08 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!ghughes From: ghughes@kiae.su (Graham Hughes) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Apr21.221908.2739@kiae.su> Date: Sun, 21 Apr 1996 22:19:08 GMT References: <1996Apr21.020008.7782@earthlink.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Apr21.020008.7782@earthlink.net>, lhernandez@earthlink.net (Liam Hernández) 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Graham Hughes US Robotics Courier V.34 @ 14,400 bps "Marcus is not one man."