From hjohansson@hanse.de Thu Sep 07 18:26:49 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!hanse!hjohansson From: hjohansson@hanse.de (Heather Johansson) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep07.182649.2077@hanse.de> Date: Thu, 07 Sep 1995 18:26:49 GMT Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Heather Johansson Tape trading list upon request. SASE required for international mail. From clarsson@clari.net Sat Sep 09 20:30:49 1995 Path: ashpoly!cascade!bigsur!clari!clarsson From: clarsson@clari.net (Callum Larsson) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep09.203049.8626@clari.net> Date: Sat, 09 Sep 1995 20:30:49 GMT References: <1995Sep07.182649.2077@hanse.de> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep07.182649.2077@hanse.de>, hjohansson@hanse.de (Heather Johansson) 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. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- Callum Larsson | clarsson@clari.net PGP Key fingerprint: 20AB 52AE 8B85 D5C1 "Keep the channels open." From epark@panix.com Sun Sep 10 22:04:49 1995 Path: ashpoly!cascade!brgate!saturno!panix!epark From: epark@panix.com (Emi Park) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep10.220449.8095@panix.com> Date: Sun, 10 Sep 1995 22:04:49 GMT References: <1995Sep07.182649.2077@hanse.de> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Sep07.182649.2077@hanse.de>, hjohansson@hanse.de (Heather Johansson) writes: > Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? -- Emi Park *PLONK* filter active for trolls. 486DX4/100 (FreeBSD 2.0.5) - NetBSD 1.0 From hnovak@purdue.edu Tue Sep 12 12:24:49 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!purdue!hnovak From: hnovak@purdue.edu (Heather Novak) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep12.122449.7846@purdue.edu> Date: Tue, 12 Sep 1995 12:24:49 GMT References: <1995Sep07.182649.2077@hanse.de> <1995Sep09.203049.8626@clari.net> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Sep09.203049.8626@clari.net>, clarsson@clari.net (Callum Larsson) writes: > The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. -- Heather Novak | hnovak@purdue.edu PGP Key fingerprint: F234 1DE9 07A5 8D8A "Keep the channels open." From bgonzalez@hanse.de Thu Sep 14 07:59:49 1995 Path: ashpoly!cascade!bigsur!hanse!bgonzalez From: bgonzalez@hanse.de (Bruno González) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep14.075949.9229@hanse.de> Date: Thu, 14 Sep 1995 07:59:49 GMT References: <1995Sep07.182649.2077@hanse.de> <1995Sep10.220449.8095@panix.com> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Sep10.220449.8095@panix.com>, epark@panix.com (Emi Park) writes: > Why would anyone build a custom dual-68000 board in 1984 when you could just buy a Texas Instruments TMS32010 DSP? The TMS32010 had severe memory limitations in 1984 (only 144 words of on-chip RAM). Dual 68000s gave them full 16MB address space. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Bruno González Tape trading list upon request. SASE required for international mail.