From bivanov@illinois.edu Sun Apr 23 07:27:18 1995 Path: ashpoly!cascade!brgate!saturno!illinois!bivanov From: bivanov@illinois.edu (Brian Ivanov) Newsgroups: comp.sys.m68k Subject: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr23.072718.9593@illinois.edu> Date: Sun, 23 Apr 1995 07:27:18 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 10 Looking at the bus architecture of the TWIN-68 board. Motorola engineers, please take a look. Disassembling ROM #0 reveals an initialization routine that checks for a hardware dongle marked 'ORION-ENC-84'. CPU #0 handles host bus interfacing and DMA, while CPU #1 is dedicated entirely to a 16-bit MAC (multiply-accumulate) unit. One 28-pin EPROM socket (labeled U14) is completely empty. What firmware was supposed to be in that socket? -- Brian Ivanov -- University of Illinois Urbana-Champaign "Marcus is not one man." From nlopez@berkeley.edu Mon Apr 24 19:40:18 1995 Path: ashpoly!cascade!transat!eunet-de!hansebox!berkeley!nlopez From: nlopez@berkeley.edu (Nadia López) Newsgroups: comp.sys.m68k Subject: Re: Data: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr24.194018.5061@berkeley.edu> Date: Mon, 24 Apr 1995 19:40:18 GMT References: <1995Apr23.072718.9593@illinois.edu> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 9 In article <1995Apr23.072718.9593@illinois.edu>, bivanov@illinois.edu (Brian Ivanov) 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. -- Nadia López SupraFAXModem 28.8 @ 33,600 bps "Marcus is not one man."