By Vladimir I. Arnol'd
Good differential equaitons are all approximately switch, and this ebook replaced my existence. I learn this greater than 30 years in the past, and the entire arithmetic i do know, I suggest fairly recognize, I discovered from this booklet. besides Aristotle's ethics, it's the most very important publication in my existence.
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The following seven bytes are called FMSZPG and serve as zero page registers for the disk file manager system (FMS). ZBUFP 67,68 0043,0044 When the FMS does disk 110, it needs to know the user filename so it can OPEN the file. It expects to find it in a buffer pointed to by ZBUFP. ZDRVA 69,70 0045 ,0046 Zero page drive pointer. FMS also uses ZRDV A in its setup, free sector, and get sector routines. I know this sounds somewhat cryptic, but it's that kind of location. 52 66-77 ZSBA 71,72 0047,0048 A pointer to the sector buffer.
BUFRFL 56 0038 If BUFRFL equals 255, then the data buffer is full. If it doesn't, it isn't. RECVDN 57 0039 If RECVDN equals 255, then all the data that was supposed to be received has been. If it doesn't, it hasn't. 49 XMTDON 58 003A If XMTDON equals 255, then all the data that was meant to be sent was. If it doesn't, it wasn't. CHKSNT 59 003B If CHKSNT equals 255 (you should know this already), then the checksum was sent. NOCKSM 60 003C More checksum stuff. A zero here means that a checksum follows the current transmission .
CHKSUM 49 0031 SIO's data frame checksum. A (much) simplified explanation of checksums is called for here. A checksum is essentially a sum of values used to check that the values were received correctly. When data gets sent somewhere, the computer adds all the values sent into one byte, and then sends that byte as the checksum value. When data is being received, the values are again added and the result compared to the checksum. If the two aren't equal, that means that at least one of the bytes received was incorrect, and the computer usually responds with an error message.
Ordinary Differential Equations by Vladimir I. Arnol'd