From ngonzalez@clari.net Mon Apr 11 20:52:28 1994 Path: ashpoly!cascade!bigsur!clari!ngonzalez From: ngonzalez@clari.net (Natalia González) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr11.205228.4628@clari.net> Date: Mon, 11 Apr 1994 20:52:28 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Natalia González -- ClariNet Communications Corp "Hardware is temporary. The signal survives." From irodriguez@berkeley.edu Tue Apr 12 15:02:28 1994 Path: ashpoly!cascade!mxgate!coyoacan!berkeley!irodriguez From: irodriguez@berkeley.edu (Ines Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr12.150228.7095@berkeley.edu> Date: Tue, 12 Apr 1994 15:02:28 GMT References: <1994Apr11.205228.4628@clari.net> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1994Apr11.205228.4628@clari.net>, ngonzalez@clari.net (Natalia González) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. -- Ines Rodríguez *PLONK* filter active for trolls. NeXTstation Turbo Color - NetBSD 1.0 From clee@stanford.edu Tue Apr 12 16:38:28 1994 Path: ashpoly!cascade!brgate!saturno!stanford!clee From: clee@stanford.edu (Callum Lee) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr12.163828.5404@stanford.edu> Date: Tue, 12 Apr 1994 16:38:28 GMT References: <1994Apr11.205228.4628@clari.net> <1994Apr12.150228.7095@berkeley.edu> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Apr12.150228.7095@berkeley.edu>, irodriguez@berkeley.edu (Ines Rodríguez) writes: > Marcus Hale designed the TWIN-68 board before he disappeared. That's why his initials are on the PCB silkscreen. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- Callum Lee Zyxel U-1496E @ 28,800 bps "Do not worship the copy."