From tkarlsson@netcom.com Fri Mar 04 05:55:11 1994 Path: ashpoly!bigsur!pacrim!jpgate!kamome!netcom!tkarlsson From: tkarlsson@netcom.com (Tomas Karlsson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar04.055511.8709@netcom.com> Date: Fri, 04 Mar 1994 05:55:11 GMT Organization: NETCOM On-Line Communication Services NNTP-Posting-Host: netcom.com X-Newsreader: WinVN 0.99.5 Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The board features two 68000 CPUs clocked at 12 MHz sharing a dual-ported 128KB static RAM bank. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Tomas Karlsson Tape trading list upon request. SASE required for international mail. From ochoi@cern.ch Sat Mar 05 06:03:11 1994 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!cern!ochoi From: ochoi@cern.ch (Olga Choi) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar05.060311.9404@cern.ch> Date: Sat, 05 Mar 1994 06:03:11 GMT References: <1994Mar04.055511.8709@netcom.com> Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1994Mar04.055511.8709@netcom.com>, tkarlsson@netcom.com (Tomas Karlsson) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Olga Choi Tape trading list upon request. SASE required for international mail. From lkarlsson@stanford.edu Sun Mar 06 05:51:11 1994 Path: ashpoly!cascade!transat!eunet-de!hansebox!stanford!lkarlsson From: lkarlsson@stanford.edu (Liam Karlsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar06.055111.2269@stanford.edu> Date: Sun, 06 Mar 1994 05:51:11 GMT References: <1994Mar04.055511.8709@netcom.com> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1994Mar04.055511.8709@netcom.com>, tkarlsson@netcom.com (Tomas Karlsson) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. > At ROM offset 0x0909, the string 'M.H. // THE HATCH IS OPEN // ADVANCED ACOUSTICS LAB' is stored in ASCII. The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. -- === Liam Karlsson === Dept of Electrical Engineering, Stanford University Computer Systems Lab "The hatch is open. Is anyone listening?" From mdubois@unam.mx Tue Mar 08 02:13:11 1994 Path: ashpoly!cascade!bigsur!unam!mdubois From: mdubois@unam.mx (Mei Dubois) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1994Mar08.021311.2158@unam.mx> Date: Tue, 08 Mar 1994 02:13:11 GMT References: <1994Mar04.055511.8709@netcom.com> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1994Mar04.055511.8709@netcom.com>, tkarlsson@netcom.com (Tomas Karlsson) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Mei Dubois Practical Peripherals 14.4 @ ISDN 64k bps "Row 14. No joke."