[Coco] 256K SuperROMPak (32 Banks)

[Chad H]

I've already 'tore out' everything that had to do with writing.  Basically, I had test boards made with the following extra jumpers so I could test different configurations...

EEPROM		Jumper Options
------		---------------------
WE#		Bus R/W - GND - VCC
OE#		Bus CTS - GND - VCC
CE#		Bus CTS - Bus OE

When I had a 'blank' EEPROM loaded and it was working right for reading, I could PEEK above &HC000 and get a '255'.  When there was problems with the OE# it would either return '128' or cause the computer to go completely berserk (At which point I about freaked and started looking for smoke coming out of the case, which fortunately it did not and all is well).

These are the posts I came across that made me realize it wasn't going to be so simple to tie into these lines.  We would need extra logic circuits/IC's....

http://comments.gmane.org/gmane.comp.hardware.tandy.coco/32296
http://comments.gmane.org/gmane.comp.hardware.tandy.coco/32888


-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Camillus Blockx
Sent: Tuesday, February 10, 2015 10:24 PM
To: Bill via Coco
Subject: Re: [Coco] 256K SuperROMPak (32 Banks)

Hi chad, I would like to see your design as it is write now. Maybe there is a way to use the RAM flash, I have some Idea's but without your schematics I'm just guessing. 


If you want to send me a copy of your schematics then I would like to see if I can help you.


Camillus 

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