From mmoreau@berkeley.edu Tue Nov 19 06:08:48 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!berkeley!mmoreau From: mmoreau@berkeley.edu (Marisol Moreau) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov19.060848.3273@berkeley.edu> Date: Tue, 19 Nov 1996 06:08:48 GMT Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 10 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Marisol Moreau -- UC Berkeley Department of EECS "Row 14. No joke." From asouza@demon.co.uk Wed Nov 20 14:08:48 1996 Path: ashpoly!cascade!brgate!saturno!demon!asouza From: asouza@demon.co.uk (Anton Souza) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov20.140848.4604@demon.co.uk> Date: Wed, 20 Nov 1996 14:08:48 GMT References: <1996Nov19.060848.3273@berkeley.edu> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Nov19.060848.3273@berkeley.edu>, mmoreau@berkeley.edu (Marisol Moreau) writes: > 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Anton Souza "Measuring a record you own is listening, not piracy." Mac IIci / 68882 FPU / System 7.5.1 From rgirard@earthlink.net Wed Nov 20 21:48:48 1996 Path: ashpoly!cascade!bigsur!earthlink!rgirard From: rgirard@earthlink.net (Rodrigo Girard) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Nov20.214848.3184@earthlink.net> Date: Wed, 20 Nov 1996 21:48:48 GMT References: <1996Nov19.060848.3273@berkeley.edu> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Nov19.060848.3273@berkeley.edu>, mmoreau@berkeley.edu (Marisol Moreau) writes: > 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. That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. -- Rodrigo Girard Tape trading list upon request. SASE required for international mail.