RE: [N8VEM-S100:4818] 8080 board BOM questions/Errata?

Corrections made, new Rev 3 documents available at:

http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=S-100%20ALTAIR-IMSAI%208080%20CPU%20Board

Regards,
Josh Bensadon

From: crus...@hotmail.com
To: n8vem...@googlegroups.com
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: jgal...@optonline.net
Subject: Re: [N8VEM-S100:4815] 8080 board BOM questions/Errata?
To: n8vem...@googlegroups.com

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 n8vem-s100+...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.