From jrobertson@illinois.edu Thu May 25 01:25:45 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!illinois!jrobertson From: jrobertson@illinois.edu (Jen Robertson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May25.012545.5420@illinois.edu> Date: Thu, 25 May 1995 01:25:45 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu 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'. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Jen Robertson "Row 14. No joke." 486DX4/100 (FreeBSD 2.0.5) / TOS 4.04 From emoreau@purdue.edu Sat May 27 04:57:45 1995 Path: ashpoly!cascade!bigsur!purdue!emoreau From: emoreau@purdue.edu (Emi Moreau) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May27.045745.7162@purdue.edu> Date: Sat, 27 May 1995 04:57:45 GMT References: <1995May25.012545.5420@illinois.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995May25.012545.5420@illinois.edu>, jrobertson@illinois.edu (Jen Robertson) 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'. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Emi Moreau -- Purdue University Engineering Computer Network "We don't sign stars. We build them." From imuller@purdue.edu Sat May 27 14:02:45 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!imuller From: imuller@purdue.edu (Ines Müller) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May27.140245.6671@purdue.edu> Date: Sat, 27 May 1995 14:02:45 GMT References: <1995May25.012545.5420@illinois.edu> <1995May27.045745.7162@purdue.edu> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995May27.045745.7162@purdue.edu>, emoreau@purdue.edu (Emi Moreau) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. 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. -- Ines Müller *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0