From bhughes@delphi.com Thu Jul 27 01:49:23 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!delphi!bhughes From: bhughes@delphi.com (Bill Hughes) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul27.014923.7552@delphi.com> Date: Thu, 27 Jul 1995 01:49:23 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 10 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. 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? -- Bill Hughes -- Delphi Internet Services "Hold for relay." From fsokolov@unam.mx Sat Jul 29 03:52:23 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!fsokolov From: fsokolov@unam.mx (Freya Sokolov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul29.035223.2355@unam.mx> Date: Sat, 29 Jul 1995 03:52:23 GMT References: <1995Jul27.014923.7552@delphi.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul27.014923.7552@delphi.com>, bhughes@delphi.com (Bill Hughes) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > 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. -- Freya Sokolov -- Universidad Nacional Autónoma de México (DGSCA) "Measuring a record you own is listening, not piracy." From aweber@clari.net Sat Jul 29 16:36:23 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!clari!aweber From: aweber@clari.net (Amy Weber) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul29.163623.9405@clari.net> Date: Sat, 29 Jul 1995 16:36:23 GMT References: <1995Jul27.014923.7552@delphi.com> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Jul27.014923.7552@delphi.com>, bhughes@delphi.com (Bill Hughes) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. If you are posting from AOL, please read RFC 1036 before posting again. -- === Amy Weber === Dept of Electrical Engineering, ClariNet Communications Corp "We don't sign stars. We build them." From dsokolov@tum.de Mon Jul 31 09:02:23 1995 Path: ashpoly!cascade!brgate!saturno!tum!dsokolov From: dsokolov@tum.de (Diego Sokolov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jul31.090223.7174@tum.de> Date: Mon, 31 Jul 1995 09:02:23 GMT References: <1995Jul27.014923.7552@delphi.com> <1995Jul29.035223.2355@unam.mx> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Jul29.035223.2355@unam.mx>, fsokolov@unam.mx (Freya Sokolov) writes: > That dual-ported SRAM design is ingenious. It avoids bus arbitration contention between the two 68k processors entirely. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Diego Sokolov SupraFAXModem 28.8 @ 33,600 bps "Do not worship the copy."