From kmartinez@mindspring.com Thu May 11 06:29:12 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mindspring!kmartinez From: kmartinez@mindspring.com (Kirsty Martínez) Newsgroups: comp.sys.m68k Subject: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May11.062912.7258@mindspring.com> Date: Thu, 11 May 1995 06:29:12 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 11 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? -- Kirsty Martínez *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0 From ksilva@utexas.edu Thu May 11 19:25:12 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!utexas!ksilva From: ksilva@utexas.edu (Karen Silva) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May11.192512.9486@utexas.edu> Date: Thu, 11 May 1995 19:25:12 GMT References: <1995May11.062912.7258@mindspring.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 12 In article <1995May11.062912.7258@mindspring.com>, kmartinez@mindspring.com (Kirsty Martínez) 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. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Top-posters will be placed in my ~/.killfile without notice. -- Karen Silva Opinions expressed are solely my own and not those of University of Texas at Austin. ------------------------------------------------------------ From dschneider@kth.se Sat May 13 09:13:12 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!kth!dschneider From: dschneider@kth.se (Dmitri Schneider) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May13.091312.5164@kth.se> Date: Sat, 13 May 1995 09:13:12 GMT References: <1995May11.062912.7258@mindspring.com> <1995May11.192512.9486@utexas.edu> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 8 In article <1995May11.192512.9486@utexas.edu>, ksilva@utexas.edu (Karen Silva) writes: > Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Dmitri Schneider Tape trading list upon request. SASE required for international mail. From dokonkwo@kth.se Sun May 14 22:04:12 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!dokonkwo From: dokonkwo@kth.se (Dmitri Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: Discussion: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995May14.220412.3829@kth.se> Date: Sun, 14 May 1995 22:04:12 GMT References: <1995May11.062912.7258@mindspring.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: Netscape 1.1N Lines: 9 In article <1995May11.062912.7258@mindspring.com>, kmartinez@mindspring.com (Kirsty Martínez) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Looks like a prototype telecommunications board for military secure voice, not an audio music product. -- Dmitri Okonkwo Opinions expressed are solely my own and not those of Royal Institute of Technology, Stockholm. ------------------------------------------------------------