That’s great. Pleased to hear you tracked it down - another 100 survives :) Now you have two and that’s how it all starts….
If you want to build RAM modules for the M100 I have two RAM PCBs on OSH Park: SMD Version and DIP version. The design is based on the old NEC modules. https://oshpark.com/shared_projects/V0tpeuMg https://oshpark.com/shared_projects/Ra3VwoJo There are a few different options to add pins to the PCBs for mounting. From: M100 <m100-boun...@lists.bitchin100.com<mailto:m100-boun...@lists.bitchin100.com>> on behalf of Jeffrey Birt <bir...@soigeneris.com<mailto:bir...@soigeneris.com>> Reply-To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Date: Sunday, May 13, 2018 at 6:52 PM To: <m...@bitchin100.com<mailto:m...@bitchin100.com>> Subject: Re: [M100] SPAM-LOW: Re: New member - question on 'half' alive Model 100 Update… It was the RAM module. After thinking about it after Fugu’s email the other day it occurred to me I had done a capture of the standard RAM bank select lines (and I happened to dave it) and after looking at it again it looked fine. This evening I pulled the standard RAM module out, split apart a 30 pin DIP socket to make two 15 pin SIPs and plugged in of the option RAMs. AND…nothing. Sigh… Then I noticed I had not plugged the ROM back in after cleaning the flux from the board. So, the ROM was installed, and STRL-BRK done on power up and…It’s ALIVE! Bwa-ha-ha-ha! It’s ALIVE! I tried reflowing the original standard RAM module and it still did not work. I could ohm out each line to each individual RAM chip and maybe get lucky and find one open trace, but I would guess that a bad RAM chip is more likely. I’ll look into making some more RAM module or buying a few, for now I have 16K. As luck would have it the second M100 I bought from across the state arrived yesterday, I still have not opened it yet. It is supposed to work, got it from the original owner who seemed like a nice guy. A grand total of $61 including shipping. Now I’ll put together an order for enough caps to finish recapping the first M100 and re-cap the 2nd one while I’m at it. I also need to try and calculate a super-cap size that will at least match the original NiCad battery. Thanks again everyone (especially Fugu) for your help. Jeff
