Reading data from a 2764a eprom

Brian_B

Hi,
I have a old 6801 that I want to replace with the propeller, I want to read the machine code out of the eprom so that I can see exactly how it was programmed. I've included the data sheet ,from what I can tell you set the CE to 1 ,the OE to 1 and then do a inca from address 0 to address 8,000 , reading the 8 bit pattern from every one. Does this sound right ?

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Thank's Brian




"Imagination is more important than knowledge..." Albert Einstein

www.PropelX.com

Phil Pilgrim (PhiPi)

No, /CE and /OE are active low. I think you can just hold these low and change the address on the fly. Be sure to wait at least t_ACC after each address change, though, before reading the data. Also, addressing goes from 0 to 8191 (not 8000).

-Phil

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'Still some PropSTICK Kit bare PCBs left!

Leon

I think Phil is correct. I wrote some software for programming and reading 2764 EPROMs with a Z8 MCU many years ago. I used a counter to generate the address, but that won't be needed with the Propeller. The Z8 wasn't very fast, but I needed to introduce a delay after setting up the data and address.

Leon

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Brian_B

Thanks' guys , this is a mess but seems to work . Also I had to pull /pgm to 1 to read.

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Thank's Brian




"Imagination is more important than knowledge..." Albert Einstein

www.PropelX.com