RE: [N8VEM-S100:6097] Crusty's S100-8080 CPU Card

[litte...@mchsi.com]

Josh,

I may have not been very clear, I can do OTP's, just have 
never done them before.  

I'm used to the old erase and reprogram.

Todd
 
----- Original Message -----
From: Crusty OMO <crus...@hotmail.com>
To: n8vem...@googlegroups.com
Sent: Wed, 28 Jan 2015 08:29:25 -0600 (CST)
Subject: RE: [N8VEM-S100:6097] Crusty's S100-8080 CPU Card

Todd,
 
I've used 128M and 1G SD cards with success.  I would say they are No-name brands.
 
I also have a 4G that doesn't work.  Just be sure to format these with FAT-16.  From Windows XP, they just call it "FAT".
 
As for the eprom, if you don't have what to program it with, I don't see how OTP's are going to be of any help.  I would take Gary's offer for a programmed EPROM.  I can offer an EPROM too, but shipping from Canada will cost you more.
 
Cheers,
Josh

 
Date: Tue, 27 Jan 2015 19:09:45 -0800
From: litte...@gmail.com
To: n8vem...@googlegroups.com
Subject: [N8VEM-S100:6096] Crusty's S100-8080 CPU Card

I've been building this board and it's about 90 % populated.

While I'm waiting for parts, I was wondering about memory.

 1.  For the SD Card, what is recommended size & brand ?

 2.  27C256 Eprom ?  

My Data I/O took a shit a long time ago and I sold my NeedHams. I do Have a 
EasyPro 90B that will do AT27C256 but they are OTP.  I'm accustomed to erasing 
& reprogramming, but it takes 30 mins to erase under UV light.  I have many UV 
Eproms, but nothing to program them.  They are just too old.

I see Mouser has;

http://www.mouser.fr/ProductDetail/Atmel/AT27C256R-70PU/?qs=sGAEpiMZZMutXGli8Ay4kN4PpSZpwfyv80jBz050W6M%3d

Considering they only cost $1.98 each and are OTP, the "low cost"-vs-"erase time" makes sense.
I have never used OTP, but I could buy a few and write a few and compare.  Once I know my 
programming hardware works I could go forward....














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