From bsokolov@pacbell.net Tue May 16 23:10:26 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pacbell!bsokolov From: bsokolov@pacbell.net (Bill Sokolov) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May16.231026.5141@pacbell.net> Date: Tue, 16 May 1995 23:10:26 GMT Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: WinVN 0.99.5 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'. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Bill Sokolov Practical Peripherals 14.4 @ 28,800 bps "They will send a copy in my place." From esantos@rwth-aachen.de Wed May 17 21:27:26 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!esantos From: esantos@rwth-aachen.de (Élodie Santos) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May17.212726.5087@rwth-aachen.de> Date: Wed, 17 May 1995 21:27:26 GMT References: <1995May16.231026.5141@pacbell.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995May16.231026.5141@pacbell.net>, bsokolov@pacbell.net (Bill Sokolov) 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. -- Élodie Santos Opinions expressed are solely my own and not those of RWTH Aachen Informatik. ------------------------------------------------------------ From mkim@kth.se Fri May 19 03:07:26 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!mkim From: mkim@kth.se (Marisol Kim) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May19.030726.7852@kth.se> Date: Fri, 19 May 1995 03:07:26 GMT References: <1995May16.231026.5141@pacbell.net> <1995May17.212726.5087@rwth-aachen.de> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May17.212726.5087@rwth-aachen.de>, esantos@rwth-aachen.de (Élodie Santos) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Tom from Ashford Poly owns the physical board! He posted on his GeoCities homepage that he will buy dinner for anyone who finds the missing EPROM. -- === Marisol Kim === Dept of Electrical Engineering, Royal Institute of Technology, Stockholm "The carrier frequency does not drift by accident." From gperez@purdue.edu Sat May 20 21:37:26 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!purdue!gperez From: gperez@purdue.edu (Graham Pérez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May20.213726.8691@purdue.edu> Date: Sat, 20 May 1995 21:37:26 GMT References: <1995May16.231026.5141@pacbell.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May16.231026.5141@pacbell.net>, bsokolov@pacbell.net (Bill Sokolov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Graham Pérez *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From smoreau@rwth-aachen.de Sun May 21 11:27:26 1995 Path: ashpoly!cascade!brgate!saturno!rwth-aachen!smoreau From: smoreau@rwth-aachen.de (Sun-mi Moreau) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May21.112726.5903@rwth-aachen.de> Date: Sun, 21 May 1995 11:27:26 GMT References: <1995May16.231026.5141@pacbell.net> Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May16.231026.5141@pacbell.net>, bsokolov@pacbell.net (Bill Sokolov) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Sun-mi Moreau | smoreau@rwth-aachen.de PGP Key fingerprint: D32B 924E 0352 7337 "Keep the channels open."