From bdubois@ox.ac.uk Fri Mar 17 23:06:41 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!ox!bdubois From: bdubois@ox.ac.uk (Brian Dubois) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar17.230641.5733@ox.ac.uk> Date: Fri, 17 Mar 1995 23:06:41 GMT Organization: Oxford University Computing Laboratory NNTP-Posting-Host: ox.ac.uk X-Newsreader: WinVN 0.99.5 Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Brian Dubois Tape trading list upon request. SASE required for international mail. From brodriguez@purdue.edu Sun Mar 19 21:04:41 1995 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!brodriguez From: brodriguez@purdue.edu (Bill Rodríguez) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar19.210441.1955@purdue.edu> Date: Sun, 19 Mar 1995 21:04:41 GMT References: <1995Mar17.230641.5733@ox.ac.uk> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 8 In article <1995Mar17.230641.5733@ox.ac.uk>, bdubois@ox.ac.uk (Brian Dubois) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Bill Rodríguez -- Purdue University Engineering Computer Network "We don't sign stars. We build them." From bsato@cmu.edu Tue Mar 21 05:17:41 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!cmu!bsato From: bsato@cmu.edu (Bill Sato) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar21.051741.5405@cmu.edu> Date: Tue, 21 Mar 1995 05:17:41 GMT References: <1995Mar17.230641.5733@ox.ac.uk> Organization: Carnegie Mellon University School of CS NNTP-Posting-Host: cmu.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1995Mar17.230641.5733@ox.ac.uk>, bdubois@ox.ac.uk (Brian Dubois) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. Looks like a prototype telecommunications board for military secure voice, not an audio music product. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Bill Sato *PLONK* filter active for trolls. Sun SparcStation 20 - NetBSD 1.0 From atanaka@mit.edu Tue Mar 21 13:02:41 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!mit!atanaka From: atanaka@mit.edu (Astrid Tanaka) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Mar21.130241.2765@mit.edu> Date: Tue, 21 Mar 1995 13:02:41 GMT References: <1995Mar17.230641.5733@ox.ac.uk> <1995Mar21.051741.5405@cmu.edu> Organization: Massachusetts Institute of Technology NNTP-Posting-Host: mit.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Mar21.051741.5405@cmu.edu>, bsato@cmu.edu (Bill Sato) writes: > Looks like a prototype telecommunications board for military secure voice, not an audio music product. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Astrid Tanaka Tape trading list upon request. SASE required for international mail.