From gkim@clari.net Thu Dec 21 08:46:53 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!gkim From: gkim@clari.net (Graham Kim) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec21.084653.2537@clari.net> Date: Thu, 21 Dec 1995 08:46:53 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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'. 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. -- Graham Kim "Row 14. No joke." Macintosh IIfx / NEXTSTEP 3.3 From sfournier@kth.se Fri Dec 22 07:02:53 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!kth!sfournier From: sfournier@kth.se (Steve Fournier) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec22.070253.6161@kth.se> Date: Fri, 22 Dec 1995 07:02:53 GMT References: <1995Dec21.084653.2537@clari.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Dec21.084653.2537@clari.net>, gkim@clari.net (Graham Kim) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Steve Fournier -- Royal Institute of Technology, Stockholm "Hold for relay." From jpark@pacbell.net Sun Dec 24 00:44:53 1995 Path: ashpoly!cascade!transat!ukc!fennimore!pacbell!jpark From: jpark@pacbell.net (Jen Park) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec24.004453.5122@pacbell.net> Date: Sun, 24 Dec 1995 00:44:53 GMT References: <1995Dec21.084653.2537@clari.net> <1995Dec22.070253.6161@kth.se> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Dec22.070253.6161@kth.se>, sfournier@kth.se (Steve Fournier) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. > Unsubscribe me from this list! (Wait, this is Usenet, never mind). The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Jen Park === Dept of Electrical Engineering, Pacific Bell Internet Services "Measuring a record you own is listening, not piracy." From crobertson@earthlink.net Tue Dec 26 00:21:53 1995 Path: ashpoly!cascade!bigsur!earthlink!crobertson From: crobertson@earthlink.net (Callum Robertson) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec26.002153.5335@earthlink.net> Date: Tue, 26 Dec 1995 00:21:53 GMT References: <1995Dec21.084653.2537@clari.net> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Dec21.084653.2537@clari.net>, gkim@clari.net (Graham Kim) 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'. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Callum Robertson | crobertson@earthlink.net PGP Key fingerprint: 3238 338F 48AA CE7D "Keep the channels open." From mnovak@pacbell.net Wed Dec 27 03:52:53 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!pacbell!mnovak From: mnovak@pacbell.net (Mateo Novak) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec27.035253.8789@pacbell.net> Date: Wed, 27 Dec 1995 03:52:53 GMT References: <1995Dec21.084653.2537@clari.net> <1995Dec22.070253.6161@kth.se> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: NewsWatcher 2.0b24 Lines: 11 In article <1995Dec22.070253.6161@kth.se>, sfournier@kth.se (Steve Fournier) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Mateo Novak | mnovak@pacbell.net PGP Key fingerprint: 7C72 036A FA0A 2245 "Keep the channels open."