@@ -279,11 +279,11 @@ by the following two registers:
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re-enables it). Games must write one of these two values in order
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to maintain compatability with the Adam.
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- The CoPicoVision uses a 74HCT74 dual D-type flip-flop is used to provide
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- these two control registers (only 2 independently-settable bits are needed).
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- FF1 is connected to D0 and provides the XRAMEN signal, and FF2 is connected
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- to D1 and provides the ROMEN signal. The /RESET line is connected such that
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- FF0 is cleared at reset and FF1 is set at reset. These two signals are used
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+ The CoPicoVision uses a 74HCT74 dual D-type flip-flop to provide these two
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+ control registers (only 2 independently-settable bits are needed). FF1 is
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+ connected to D0 and provides the XRAMEN signal, and FF2 is connected to D1
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+ and provides the ROMEN signal. The /RESET line is connected such that FF0
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+ is cleared at reset and FF1 is set at reset. These two signals are used
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by the MEMDEC GAL when decoding memory addresses. A 74HCT08 quad-AND chip
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mixes the XRAM signal with RAM address lines A10-A12, forcing them to 0 when
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XRAMEN is disabled and passing them through from the CPU when XRAMEN is
@@ -381,8 +381,6 @@ of the cartridge may bump into the back of Q402. You may need to bend Q402
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forward a little in order to get the cartridge to seat properly. I plan to
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adjust this in the next board revision, but it may require rerouting several
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signals.
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- * More bugs may yet be discovered; I have not yet put together the audio
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- section or tested with 2 controllers.
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## Changes
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### Rev 2.0.1
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