From bhughes@demon.co.uk Tue Dec 12 18:26:54 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!demon!bhughes From: bhughes@demon.co.uk (Bruno Hughes) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec12.182654.3022@demon.co.uk> Date: Tue, 12 Dec 1995 18:26:54 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 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. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- Bruno Hughes -- Demon Internet Services UK "A soul is not exclusive to biology." From ypetrov@unam.mx Thu Dec 14 22:10:54 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!unam!ypetrov From: ypetrov@unam.mx (Yuki Petrov) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec14.221054.3234@unam.mx> Date: Thu, 14 Dec 1995 22:10:54 GMT References: <1995Dec12.182654.3022@demon.co.uk> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Dec12.182654.3022@demon.co.uk>, bhughes@demon.co.uk (Bruno Hughes) 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. 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. -- Yuki Petrov | ypetrov@unam.mx PGP Key fingerprint: F5BA F9F3 AEB3 2DC0 "Keep the channels open." From gkang@cern.ch Sat Dec 16 18:07:54 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!gkang From: gkang@cern.ch (Göran Kang) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Dec16.180754.2997@cern.ch> Date: Sat, 16 Dec 1995 18:07:54 GMT References: <1995Dec12.182654.3022@demon.co.uk> <1995Dec14.221054.3234@unam.mx> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Dec14.221054.3234@unam.mx>, ypetrov@unam.mx (Yuki Petrov) writes: > 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Göran Kang *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0