This is what ends up in program memory at startup.<\/p>\n
\r\n000: 63 =077\r\n001: 61 =075\r\n002: 43 =053\r\n003: 30 =036\r\n004: 8 =010\r\n005: 20 =024\r\n006: 42 =052\r\n007: 43 =053\r\n008: 28 =034\r\n009: 14 =016\r\n010: 50 =062\r\n011: 42 =052\r\n012: 43 =053\r\n013: 27 =033\r\n014: 8 =010\r\n015: 19 =023\r\n016: 42 =052\r\n017: 43 =053\r\n018: 26 =032\r\n019: 13 =015\r\n020: 42 =052\r\n021: 43 =053\r\n022: 24 =030\r\n023: 17 =021\r\n024: 42 =052\r\n025: 0\r\n026: 0\r\n<\/pre>\n<\/p>\n
The 63 61 is the start of program memory marker.
\nNext, “43 30 08 20 42” is likely to be “LBL A g 4 RTN” = “A -> 1\/x”
\nThen, “43 28 14 50 42” = “LBL B f 9 RTN” = “B -> root x”
\nThen, “43 27 08 19 42” = “LBL C g 5 RTN” = “C -> Yx<\/sup>”
\nThen, “43 26 13 42” = “LBL D ? RTN” = “D -> R down” so 13 must be “g 8”
\nand, “43 24 17 42” = “LBL E ? RTN” = “E -> x <=> y” so 17 must be “g 7”<\/p>\nFor the most part, the codes stored internally by the ’65 (above) match the codes the keyboard generates on each key press. The exceptions are merged keycodes.<\/p>\n
There used to be a table showing the 64 different HP65 program codes but I’m having trouble finding a copy after so many years. I may just have to work them all out by hand! At least there’s only 64. That’s due to the program steps being stored in 6-bit memory. There are 100 program steps and these got written as 600 bits on the HP65 magnetic cards.<\/p>\n
(The HP67 fancied that up somewhat and added headers and status info and a checksum. It also uses 8-bit program steps. There was 7 nibbles of 0s for sync, 14 nibbles of status, 112 program steps (8 bits) then 7 nibbles of checksum. Hence the ’67 had (7×4 + 14×4 + 112*8 + 7*4 = 28 + 56 + 896 + 28 =) 1008 bits per card side.)<\/p>\n
Update 15 Sep 2015:
\nI found the chart again. I’ve stuck a copy at hp65-program-codes<\/a> so I can find it next time.<\/p>\n","protected":false},"excerpt":{"rendered":"This is what ends up in program memory at startup. 000: 63 =077 001: 61 =075 002: 43 =053 003: 30 =036 004: 8 =010 005: 20 =024 006: 42 =052 007: 43 =053 008: 28 =034 009: 14 =016 010: 50 =062 011: 42 =052 012: 43 =053 013: 27 =033 014: 8 =010 … Continue reading HP65 Default Program<\/span>