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Counia · 18 January 2011, 23:37

Sorry, i no remember all info , but 15 years ago i no think 27c4002 existe in very fast time-acces or in expensive version, i have 150ns or 120ns in my souvenir.

But if 68000 go at 7MHz, T=142ns between "on cycle instruction" and next instruction.
Moreover "MOVE Rom,D0" is an multi-cycle instruction if i remember rigth.
For me your 100ns is good.

I remenber an anecdote in my first test, i dump the ROM space in an file ; save it in an 720Ko PC floppy, for program the EPROM.
The echec is because 8bits-high and 8bits-low are inverted by this programmator, i code an litle program that swap bytes, and the second test is good.

I search if i have info for this.

18 January 2011, 23:37	#12
Counia Registered User Join Date: Oct 2010 Location: Bx / France Posts: 26	Sorry, i no remember all info , but 15 years ago i no think 27c4002 existe in very fast time-acces or in expensive version, i have 150ns or 120ns in my souvenir. But if 68000 go at 7MHz, T=142ns between "on cycle instruction" and next instruction. Moreover "MOVE Rom,D0" is an multi-cycle instruction if i remember rigth. For me your 100ns is good. I remenber an anecdote in my first test, i dump the ROM space in an file ; save it in an 720Ko PC floppy, for program the EPROM. The echec is because 8bits-high and 8bits-low are inverted by this programmator, i code an litle program that swap bytes, and the second test is good. I search if i have info for this.