Re: 16 bit data bus on a 6502.

From: tokafondo <tokafondo_at_gmail.com>
Date: Mon, 12 Oct 2020 15:32:19 -0500 (CDT)
Message-ID: <1602534739293-0.post_at_n4.nabble.com>
Thanks. I'm going back to the first proposal I made to Bill Mensch.

So, would...

CLC
XCE
REP #$20
LDA #$ABCD
STA $1000
SEP #$20
LDA $1001
STA $ADDRESS_OF_PARALLEL_PORT_CONNECTED_TO_MSB_OF_16BIT_MEMORY_CHIP
LDA $1000
STA $ADDRESS_OF_16_BIT_MEMORY_CHIP_BEING_LSB_OF_PARALLEL_PORT_VALUE

...work?

Do the parallel port latch the MSB value there? or does it lasts for some
ns,us or ms?



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Received on 2020-10-12 23:00:43

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