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]
<mailto:[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]
<mailto:[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]
<mailto:[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.
