From jperez@unam.mx Sun May 12 23:43:27 1996 Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!jperez From: jperez@unam.mx (Ji-woo Pérez) Newsgroups: comp.sys.m68k Subject: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May12.234327.8494@unam.mx> Date: Sun, 12 May 1996 23:43:27 GMT Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: NewsWatcher 2.0b24 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. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. Schematic diagram in ASCII uploaded to ftp.ashford-poly.edu:/pub/telecom-archives/twin68_array.asc. -- Ji-woo Pérez US Robotics Courier V.34 @ 9600 Telebit bps "Hardware is temporary. The signal survives." From akarlsson@demon.co.uk Mon May 13 05:55:27 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!demon!akarlsson From: akarlsson@demon.co.uk (Aiko Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1996May13.055527.5884@demon.co.uk> Date: Mon, 13 May 1996 05:55:27 GMT References: <1996May12.234327.8494@unam.mx> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: Netscape 1.1N Lines: 9 In article <1996May12.234327.8494@unam.mx>, jperez@unam.mx (Ji-woo Pérez) 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. -- Aiko Karlsson "Row 14. No joke." 486DX2/66 (Linux 1.2.13) / NEXTSTEP 3.3