6530 replacement

From: Ruud_at_Baltissen.org
Date: Tue, 08 Oct 2013 18:31:57 +0200
Message-ID: <5254337D.7895.5F3AFE@Ruud.Baltissen.org>
Hallo allemaal,

I designed and built a 6530 replacement, please see:


The problem: it doesn't work :( I get five blinks on my 8250LP, 
meaning: error zero page RAM 6530. Please have a look at the 
schematic and maybe you can see if I am overlooking something. Many 

Adding to the problem: I cannot upload a program to the 8250 in this 
state and thus cannot test the circuit with it. One idea is to 
replace the original EPROM with one that checks my design, writes 
its findings to memory and tells the bus system everything is OK. 
With a memory-read I then can read the results. But a bit far 
searched IMHO. So other ideas are welcome!

Kind regards / Met vriendelijke groet, Ruud Baltissen

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Received on 2013-10-08 17:00:05

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