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ZMMFS: Make the RAM test resiliant to stray capacitance #21

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hoglet67 opened this issue Sep 27, 2019 · 1 comment
Open

ZMMFS: Make the RAM test resiliant to stray capacitance #21

hoglet67 opened this issue Sep 27, 2019 · 1 comment
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@hoglet67
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;; Step 3: Check if slot is RAM
.testram
        lda     &8006
        eor     #&FF
        sta     &8006
        cmp     &8006

We really need to write two locations with two different values.

See: https://stardot.org.uk/forums/viewtopic.php?p=249327#p249327
@hoglet67
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Or add a additional CMP which reads a different value from the same ROM, and perturbs the data bus.

@hoglet67 hoglet67 changed the title Make the RAM test resiliant to stray capacitance ZMMFS: Make the RAM test resiliant to stray capacitance Jul 1, 2021
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@hoglet67