From knakamura@panix.com Tue Nov 14 14:02:53 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!knakamura From: knakamura@panix.com (Karen Nakamura) Newsgroups: comp.sys.m68k Subject: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov14.140253.7703@panix.com> Date: Tue, 14 Nov 1995 14:02:53 GMT Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Karen Nakamura -- Public Access Unix of New York "Measuring a record you own is listening, not piracy." From afischer@uu.net Wed Nov 15 18:32:53 1995 Path: ashpoly!cascade!brgate!saturno!uu!afischer From: afischer@uu.net (Amy Fischer) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov15.183253.5031@uu.net> Date: Wed, 15 Nov 1995 18:32:53 GMT References: <1995Nov14.140253.7703@panix.com> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov14.140253.7703@panix.com>, knakamura@panix.com (Karen Nakamura) writes: > Hardware teardown of the dual-68000 DSP accelerator board used in the Stardust project. > CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Amy Fischer | afischer@uu.net PGP Key fingerprint: 49E0 4013 B830 4A2F "Keep the channels open." From lweber@mit.edu Fri Nov 17 10:52:53 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!mit!lweber From: lweber@mit.edu (Lucia Weber) Newsgroups: comp.sys.m68k Subject: Re: [FLAME] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Nov17.105253.1169@mit.edu> Date: Fri, 17 Nov 1995 10:52:53 GMT References: <1995Nov14.140253.7703@panix.com> <1995Nov15.183253.5031@uu.net> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: Netscape 1.1N Lines: 11 In article <1995Nov15.183253.5031@uu.net>, afischer@uu.net (Amy Fischer) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Lucia Weber SupraFAXModem 28.8 @ 19,200 bps "Tape doesn't lie at 02:14. Ears do."