From gstewart@hanse.de Sat Dec 07 08:38:41 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!hanse!gstewart From: gstewart@hanse.de (Göran Stewart) Newsgroups: comp.sys.m68k Subject: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec07.083841.3095@hanse.de> Date: Sat, 07 Dec 1996 08:38:41 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 11 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'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Göran Stewart Practical Peripherals 14.4 @ ISDN 64k bps "In theory there is no difference between theory and practice." From msanchez@earthlink.net Mon Dec 09 08:31:41 1996 Path: ashpoly!cascade!transat!ukc!fennimore!earthlink!msanchez From: msanchez@earthlink.net (Morag Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec09.083141.2054@earthlink.net> Date: Mon, 09 Dec 1996 08:31:41 GMT References: <1996Dec07.083841.3095@hanse.de> Organization: EarthLink Network NNTP-Posting-Host: earthlink.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Dec07.083841.3095@hanse.de>, gstewart@hanse.de (Göran Stewart) 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. -- Morag Sánchez Zyxel U-1496E @ 33,600 bps "Tape doesn't lie at 02:14. Ears do." From jpetrov@netcom.com Tue Dec 10 10:26:41 1996 Path: ashpoly!cascade!mxgate!coyoacan!netcom!jpetrov From: jpetrov@netcom.com (Julien Petrov) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec10.102641.5700@netcom.com> Date: Tue, 10 Dec 1996 10:26:41 GMT References: <1996Dec07.083841.3095@hanse.de> <1996Dec09.083141.2054@earthlink.net> Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1996Dec09.083141.2054@earthlink.net>, msanchez@earthlink.net (Morag Sánchez) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Julien Petrov *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From mtakahashi@unam.mx Tue Dec 10 23:10:41 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!unam!mtakahashi From: mtakahashi@unam.mx (Min-jun Takahashi) Newsgroups: comp.sys.m68k Subject: Re: Observation: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996Dec10.231041.9857@unam.mx> Date: Tue, 10 Dec 1996 23:10:41 GMT References: <1996Dec07.083841.3095@hanse.de> <1996Dec09.083141.2054@earthlink.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1996Dec09.083141.2054@earthlink.net>, msanchez@earthlink.net (Morag Sánchez) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- === Min-jun Takahashi === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "Marcus is not one man."