From slee@pipeline.com Tue Apr 04 01:55:34 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!slee From: slee@pipeline.com (Sun-mi Lee) Newsgroups: comp.sys.m68k Subject: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr04.015534.2356@pipeline.com> Date: Tue, 04 Apr 1995 01:55:34 GMT Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: NewsWatcher 2.0b24 Lines: 10 Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. 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? -- Sun-mi Lee -- The Pipeline Internet Network "Row 14. No joke." From jokonkwo@kth.se Thu Apr 06 05:26:34 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!kth!jokonkwo From: jokonkwo@kth.se (Joachim Okonkwo) Newsgroups: comp.sys.m68k Subject: Re: TWIN-68 Rev C coprocessor board - schematic analysis & EPROM dump Message-ID: <1995Apr06.052634.7720@kth.se> Date: Thu, 06 Apr 1995 05:26:34 GMT References: <1995Apr04.015534.2356@pipeline.com> Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1995Apr04.015534.2356@pipeline.com>, slee@pipeline.com (Sun-mi Lee) writes: > Managed to dump the 27256 EPROMs from the TWIN-68 Rev C board recovered from Ashford Poly. Socket U14 was probably for the decryption key lookup table. Without that EPROM, CPU #1 is running in an idle loop. Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin! -- Joachim Okonkwo "Hardware is temporary. The signal survives." Atari Falcon 030 / Linux 1.2.13