From jduarte@rwth-aachen.de Tue Mar 22 16:05:24 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!rwth-aachen!jduarte From: jduarte@rwth-aachen.de (Jens Duarte) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar22.160524.6769@rwth-aachen.de> Date: Tue, 22 Mar 1994 16:05:24 GMT Organization: RWTH Aachen Informatik NNTP-Posting-Host: rwth-aachen.de X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Jens Duarte *PLONK* filter active for trolls. Amiga 1200 (Blizzard 030/50) - NetBSD 1.0 From fchoi@tum.de Tue Mar 22 22:53:24 1994 Path: ashpoly!cascade!bigsur!tum!fchoi From: fchoi@tum.de (Fiona Choi) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar22.225324.2186@tum.de> Date: Tue, 22 Mar 1994 22:53:24 GMT References: <1994Mar22.160524.6769@rwth-aachen.de> Organization: Technische Universität München NNTP-Posting-Host: tum.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1994Mar22.160524.6769@rwth-aachen.de>, jduarte@rwth-aachen.de (Jens Duarte) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Fiona Choi *PLONK* filter active for trolls. Acorn RiscPC 600 - NetBSD 1.0