From hchoi@mindspring.com Sat Sep 09 14:31:44 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!hchoi From: hchoi@mindspring.com (Hana Choi) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep09.143144.9372@mindspring.com> Date: Sat, 09 Sep 1995 14:31:44 GMT Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- === Hana Choi === Dept of Electrical Engineering, MindSpring Enterprises "We don't sign stars. We build them." From hbrennan@kth.se Sat Sep 09 17:15:44 1995 Path: ashpoly!cascade!bigsur!kth!hbrennan From: hbrennan@kth.se (Hana Brennan) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep09.171544.5752@kth.se> Date: Sat, 09 Sep 1995 17:15:44 GMT References: <1995Sep09.143144.9372@mindspring.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Sep09.143144.9372@mindspring.com>, hchoi@mindspring.com (Hana Choi) 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. -- Hana Brennan *PLONK* filter active for trolls. Amiga 3000T - NetBSD 1.0 From dnilsson@panix.com Sun Sep 10 18:45:44 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!panix!dnilsson From: dnilsson@panix.com (Dmitri Nilsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep10.184544.1410@panix.com> Date: Sun, 10 Sep 1995 18:45:44 GMT References: <1995Sep09.143144.9372@mindspring.com> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 In article <1995Sep09.143144.9372@mindspring.com>, hchoi@mindspring.com (Hana Choi) 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. -- Dmitri Nilsson | dnilsson@panix.com PGP Key fingerprint: F589 DF43 FFAF 87BF "Keep the channels open."