Jeff, I have the same issue... I pack everything away with the idea that it's still useful, I will use it some day. Of course, in reality, I probably reuse 1% of what I pack away... But every now and then, I come across a project where I'm really happy I had that part in stock.
I recently bought a TL 866CS eprom programmer and IC tester. I have only used it a couple of times to program. But it's very neat to think it can test the IC's too. How were those mis-labeld IC's? I heard China relabels some chips to scam people. :)J Date: Mon, 4 Aug 2014 10:28:09 -0400 From: [email protected] Subject: Re: [N8VEM-S100:4821] 8080 board BOM questions/Errata? To: [email protected] Josh, Thank you for the updates! I will send some pics when I am into the build. Due to my habit of extreme pack-rat-ism I only need to order a few parts, like the SD card socket, the crystal, the resistor networks, the HCT245 and the LS390. The years of accumulating parts from hamfests is starting to pay off. :) BTW, I also bought an IC tester so I check every TTL chip for functionality before I put it a board. I have found a few bad chips this way & even a few mis-labeled chips. Regards, Jeff On 8/4/2014 12:52 AM, Crusty OMO wrote: Corrections made, new Rev 3 documents available at: http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder¶m=S-100%20ALTAIR-IMSAI%208080%20CPU%20Board Regards, Josh Bensadon From: [email protected] To: [email protected] Subject: RE: [N8VEM-S100:4818] 8080 board BOM questions/Errata? Date: Mon, 4 Aug 2014 00:13:31 -0400 Hi Jeff, 1. Oops... ECO#3 should be "RP2". RP3 remains as is (a 9 pin 4.7K SIP). I will fix this shortly and upload a Rev 3 Manual. 2. I'll look at the BOM and correct. It indeed should be a 74LS390 as listed in the BOM of the manual. 3. Mouser p/n 520-HCA1843-20X (Mfg P/N: ECS-184-20-1X) Please send pics when you can. Cheers, Josh Date: Sun, 3 Aug 2014 17:15:51 -0400 From: [email protected] Subject: Re: [N8VEM-S100:4815] 8080 board BOM questions/Errata? To: [email protected] Josh/Don, I was gathering parts for my build & I have some questions about possible errors with the BOM for the 8080 CPU board. 1) I see that RP2 is now listed as a 47K network (was formerly a 4.7K network) but I did not see that change documented anywhere. I realize that the value of RP3 changed as documented in ECO#3 but I found nothing about RP2. 2) IC E6 is now listed as a 74LS90 in the BOM but it is a 74LS390 in the schematic, in the original parts list in the manual & on the board silkscreen. The LS390 is a dual counter an is a 16 pin dip while the LS90 is a single counter in a 14 pin dip. 3) I didn't see the recommended crystal X1 (18.432mhz) is not listed in either the original parts list or the updated BOM. I was just going to pick the one that Mouser has in stock. Thanks for all you are both doing for this project. I am look forward to this build as well as as the Mini-FP board. Regards, Jeff Galinat On 8/2/2014 3:43 PM, Crusty OMO wrote: Hi Don, Sure. I wrote it into the Rev 2 Manual. I also updated your Bill-of-materials with the right values for RP2, but I missed adding it as an ECO there. Cheers, Josh -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "N8VEM-S100" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
