From kkim@delphi.com Sat Jun 17 10:11:25 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!delphi!kkim From: kkim@delphi.com (Kirsty Kim) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun17.101125.6912@delphi.com> Date: Sat, 17 Jun 1995 10:11:25 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. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. 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? -- Kirsty Kim Tape trading list upon request. SASE required for international mail. From pramirez@cam.ac.uk Sat Jun 17 11:53:25 1995 Path: ashpoly!cascade!brgate!saturno!cam!pramirez From: pramirez@cam.ac.uk (Pavel Ramírez) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Jun17.115325.5148@cam.ac.uk> Date: Sat, 17 Jun 1995 11:53:25 GMT References: <1995Jun17.101125.6912@delphi.com> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Jun17.101125.6912@delphi.com>, kkim@delphi.com (Kirsty Kim) 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. -- Pavel Ramírez "Hold for relay." Mac IIci / 68882 FPU / SunOS 4.1.4