Path: csiph.com!weretis.net!feeder6.news.weretis.net!usenet.blueworldhosting.com!feed1.usenet.blueworldhosting.com!peer03.iad!feed-me.highwinds-media.com!news.highwinds-media.com!fx15.iad.POSTED!not-for-mail From: Daniel Newsgroups: comp.sys.tandy Subject: Re: TRS-80 Model 100 Board Replication References: <877cwved6z.fsf@sc1f1dan.com> Message-ID: <87sffhdgq7.fsf@sc1f1dan.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) Cancel-Lock: sha1:JYkcV5T+j4n0+xfOtnD3eX/hytI= MIME-Version: 1.0 Content-Type: text/plain Lines: 42 X-Complaints-To: abuse(at)newshosting.com NNTP-Posting-Date: Tue, 07 Feb 2023 08:25:52 UTC Organization: Newshosting.com - Highest quality at a great price! www.newshosting.com Date: Tue, 07 Feb 2023 08:25:52 +0000 X-Received-Bytes: 2697 Xref: csiph.com comp.sys.tandy:650 Black Epyon writes: > On Sunday, 5 February 2023 at 18:32:23 UTC-8, Daniel wrote: >> I guess I've decided to do a board replication project starting on the >> M100. At this point, I'm looking for a dead model on ebay but no one >> wants to sell for less than $100 with shipping it seems. I'd pay $50 for >> a 'for parts' unit. >> >> Success will define this project if I can get some assistance. I have >> designed pcb's in the past but for simple projects. This will be, by >> far, my most complex effort to date. And I hope a success in this >> project will lead to more restoration projects in the future. >> >> Daniel > Are you planning on doing a drop-in replacement "replica" using modern > components, or just an emulator? There's a copy of the service manual > on Internet Archive that has the schematics, and should help get you > started. > https://archive.org/details/TandyM100ServiceManual/page/n81/mode/2up I'm planning a replica, one-for-one drop in of the board and all traces, stencils, etc. Some dead devices are due to battery leakage and traces will be destroyed in many areas - but many components will be okay. In these cases the device is usually salvaged for parts only and that means one device removed from circulation. Like the commodore, I'd like a board replacement and there's been very little interest in the project. I have the service manuals already and also have Birt's modern remake of the schematics from his github. I need to get a dead device so I can depopulate the board, remove all solder/flux, and do a high definition scan of both sides for all three boards. Later, I'd like to redesign the power supply and convert it to USB-C input and rechargable batteries, but that's way down the road. I plan on posting my progress of this project on this thread as I go - barring health issues. Also, I invite community members interested in helping with design and/or documentation. Daniel