GN_Rbe, Read byte at extended address

Register parameters

RST 20H, DEFW $3E09
     BHL = pointer to the byte to read (B = 0, local byte)

OUT, if call successful:
     A = byte at address

Registers changed after return:
     .FBCDEHL/IXIY same
     A......./.... different 

Related calls

GN_Cme, compare null-terminated strings, one local, one extended
GN_Wbe, write byte at extended address
OS_Bde, copy bytes to extended address
OS_Bhl, copy bytes from extended address

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