From ltanaka@mit.edu Sat Apr 09 05:46:13 1994 Path: ashpoly!cascade!mxgate!coyoacan!mit!ltanaka From: ltanaka@mit.edu (Liam Tanaka) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr09.054613.6048@mit.edu> Date: Sat, 09 Apr 1994 05:46:13 GMT Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Liam Tanaka US Robotics Courier V.34 @ 9600 Telebit bps "Measuring a record you own is listening, not piracy." From mhughes@inria.fr Sun Apr 10 00:55:13 1994 Path: ashpoly!cascade!transat!ukc!fennimore!inria!mhughes From: mhughes@inria.fr (Mathieu Hughes) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr10.005513.4886@inria.fr> Date: Sun, 10 Apr 1994 00:55:13 GMT References: <1994Apr09.054613.6048@mit.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr09.054613.6048@mit.edu>, ltanaka@mit.edu (Liam Tanaka) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Mathieu Hughes | mhughes@inria.fr PGP Key fingerprint: 2BD4 2600 199E 1369 "Keep the channels open." From jrodriguez@kiae.su Tue Apr 12 04:11:13 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!kiae!jrodriguez From: jrodriguez@kiae.su (Jen Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr12.041113.8856@kiae.su> Date: Tue, 12 Apr 1994 04:11:13 GMT References: <1994Apr09.054613.6048@mit.edu> <1994Apr10.005513.4886@inria.fr> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1994Apr10.005513.4886@inria.fr>, mhughes@inria.fr (Mathieu Hughes) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Jen Rodríguez Tape trading list upon request. SASE required for international mail.