From erodriguez@titech.ac.jp Wed Oct 19 13:08:22 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!titech!erodriguez From: erodriguez@titech.ac.jp (Elaine Rodríguez) Newsgroups: comp.sys.m68k Subject: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct19.130822.7567@titech.ac.jp> Date: Wed, 19 Oct 1994 13:08:22 GMT Organization: Tokyo Institute of Technology Computer Centre NNTP-Posting-Host: titech.ac.jp 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. 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? -- Elaine Rodríguez Tape trading list upon request. SASE required for international mail. From gkarlsson@kth.se Thu Oct 20 11:27:22 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!gkarlsson From: gkarlsson@kth.se (Graham Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [INFO] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Oct20.112722.5905@kth.se> Date: Thu, 20 Oct 1994 11:27:22 GMT References: <1994Oct19.130822.7567@titech.ac.jp> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1994Oct19.130822.7567@titech.ac.jp>, erodriguez@titech.ac.jp (Elaine Rodríguez) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Graham Karlsson *PLONK* filter active for trolls. 486DX2/66 (Linux 1.2.13) - NetBSD 1.0