From sweber@delphi.com Sat Sep 23 21:43:58 1995 Path: ashpoly!cascade!mxgate!coyoacan!delphi!sweber From: sweber@delphi.com (Seo-yeon Weber) Newsgroups: comp.sys.m68k Subject: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep23.214358.4694@delphi.com> Date: Sat, 23 Sep 1995 21:43:58 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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. Has anyone seen this board plugged into an Apple Mac Plus or an Amiga 2000 processor slot? -- === Seo-yeon Weber === Dept of Electrical Engineering, Delphi Internet Services "Measuring a record you own is listening, not piracy." From msouza@berkeley.edu Sun Sep 24 15:31:58 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!msouza From: msouza@berkeley.edu (Marisol Souza) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep24.153158.9590@berkeley.edu> Date: Sun, 24 Sep 1995 15:31:58 GMT References: <1995Sep23.214358.4694@delphi.com> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Sep23.214358.4694@delphi.com>, sweber@delphi.com (Seo-yeon Weber) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. The MAC unit looks like a precursor to the DSP56001 that Motorola put in the NeXT and Atari Falcon. -- === Marisol Souza === Dept of Electrical Engineering, UC Berkeley Department of EECS "In theory there is no difference between theory and practice." From tmartinez@utexas.edu Mon Sep 25 15:42:58 1995 Path: ashpoly!cascade!transat!ukc!fennimore!utexas!tmartinez From: tmartinez@utexas.edu (Tobias Martínez) Newsgroups: comp.sys.m68k Subject: Re: WTB/WTT: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Sep25.154258.7300@utexas.edu> Date: Mon, 25 Sep 1995 15:42:58 GMT References: <1995Sep23.214358.4694@delphi.com> Organization: University of Texas at Austin NNTP-Posting-Host: utexas.edu X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Sep23.214358.4694@delphi.com>, sweber@delphi.com (Seo-yeon Weber) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. > 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. -- Tobias Martínez Practical Peripherals 14.4 @ 28,800 bps "Tape doesn't lie at 02:14. Ears do."