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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: 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
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