From ereyes@uu.net Fri Apr 08 19:16:27 1994 Path: ashpoly!cascade!bigsur!uu!ereyes From: ereyes@uu.net (Emi Reyes) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr08.191627.8739@uu.net> Date: Fri, 08 Apr 1994 19:16:27 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N 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. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Emi Reyes -- UUNET Technologies, Falls Church VA "Measuring a record you own is listening, not piracy." From pnilsson@kth.se Fri Apr 08 22:07:27 1994 Path: ashpoly!cascade!bigsur!kth!pnilsson From: pnilsson@kth.se (Pavel Nilsson) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Apr08.220727.4797@kth.se> Date: Fri, 08 Apr 1994 22:07:27 GMT References: <1994Apr08.191627.8739@uu.net> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Apr08.191627.8739@uu.net>, ereyes@uu.net (Emi Reyes) 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 Nilsson "Tape doesn't lie at 02:14. Ears do." PC-9821Ap2 (NEC) / NEXTSTEP 3.3