binformat

512k eeprom.
32,000-2 cards
1k eeprom
64-2 cards


first 32 bytes of eeprom. [byte] unless otherwise specified. [#:] # bits.

card params.
[site start][site len][id start][id len]
[par type][par bit][par start][par end]
[par2 type][par2 bit][par2 start][par2 end]

open hours and config.
[ignore par][ignore site][ignore id][rsvd]
[rsvd]
[open door entry 1-2 (same format as hours info)]
[open door entry 3-4 (same format as hours info)]



id info 8 bytes.
[magic 'r'][ site 2 bytes ][ id 5 bytes]


hours info 8 bytes. 4 ranges. 4 bits hour 2 bits minute. granularity of 30 min.
entry is 2 bytes.
[4:day][6:s][6:e][4:day][6:s][6:e]
[4:day][6:s][6:e][4:day][6:s][6:e]

day bytes.
0000  no record.
1111  no record
0001  weekday
0010  weekend
0011  mon
0100  tues
0101  wed
0110  thurs
0111  fri
1000  sat
1001  sun
1010  every day

5 bits hour
00000  0:00
00001  1:00
00010  2:00
00011  3:00
...
11000  24:00

1 bit minute
0 :00
1 :30

example: 010010 5:00pm

full record (16 bits 2 bytes)
0001 (weekday) 010001 (8:30am) 010010 (5:00pm)
0010 (weekend) 000000 (12am)   11000(11:59pm) 

00010100 01010010 00100000 00110000
00000000 00000000 00000000 00000000