Thread: SD card adapter
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Old 14 September 2014, 15:56   #52
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Join Date: Dec 2013
Location: Lake Havasu City, AZ
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Originally Posted by pandy71 View Post
Interpreted by CPU? Paula? or by flux change on magnetic disk but not on semiconductor memory ?
Paula. This is a standard limitation of all disk controllers. It's a condition that must be met. Paula sends and receives bitcell time (flux) data. That data must meet certain criteria to be valid or random data is interpreted.

Yes but only when magnetic recording is involved... all you wrote about flux is valid for magnetic storage but we saving bitstream to semiconductor memory without this limitations. So let forget about flux and all magnetic problems - if this is limitation of Paula (AFAIK Paula not interpreting any data).
It's not a "limitation" really, it's a design requirement for MFM data. Paula also works with GCR data, but that also has some features (by design) that prohibit every byte value from being available.

Hardware is fast but primitive (no fifo like in common on PC 16550 etc) - drivers are slow as interrupt processing take time but once again as we can send block of data (for example 16 bytes) then perhaps overhead can be reduced...
I assume that based on this:
1Mbps should be possible especially when slow and outdated 1488/1489 will be replaced by modern level translators.
We don't have that luxury in a stock setup.
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