HOOK CODE SUMMARY ================= This is a summary of each Hook Code, it's name, shadow ROM location and function. Code Name ROM1 ROM2 ROM3 Function ---- ---- -------------- -------- 1B PAUSE 19D9 1ECD 1ECF Wait for key to be pressed - value A. 1C PRINT 19EC 1EE0 1EE2 print CHR$ A on system stream $FE (the screen). 1D 232IN 0B81 0B88 0B88 RS232 input in A - carry if invalid. 1E 232OUT 0C5A 0D07 0D07 RS232 output character code in A. 1F LPRINT 19FC 1EF0 1EF2 print CHR$ A on stream 3 (the printer). 20 SCAN_K 1A01 1EF5 1EF7 scan the keyboard matrix - NZ if any pressed. 21 MOTOR 17F7 1532 1532 switch microdrive motors on or off. 22 OPEN_M 1B29 1B05 1B05 open a temporary "M" channel. 23 CLOSE_M 12A9 138E 138E close a "M" channel. 24 ERASE_M 1D6E 1D79 1D7B erase a file from a cartridge. 25 READ_NP 1A09 1EFD 1EFF read in the next PRINT buffer. 26 WRITE_S 11FF 12DA 12DA send the "M" buffer to the cartridge. 27 READ_P 1A17 1F0B 1F0D read in a PRINT buffer. 28 READ_R 1A4B 1F3F 1F41 search for a random file. 29 READ_S 1A86 1F7A 1F7C search for a serial file. 2A WRITE_R 1A91 1F85 1F87 write a block randomly. 2B MAKE_M ---- 10A5 10A5 create "M" area. 2C RECLAIM 10C4 119F 119F reclaim a 595 byte "M" channel. 2D OPEN_N 0EA9 0F46 0F46 open a temporary "N" channel. 2E CLOSE_N 1A2F 1F18 1F1A close a "N" channel. 2F READ_N ---- 1F25 1F27 read a Network packet. 30 WRITE_N 0DB2 0E4F 0E4F write a Network packet. 31 NEWVARS 19A8 1E98 1E9A create the extra system vars if required. 32 SHADOW 19A4 1E94 1E96 call the shadow ROM routine addressed. 33 SCAN_M ---- 1FE4 1FE6 read the next cartridge header. 34 OPEN_B ---- 1FF6 1FF8 open "B" channel. Source: Master Your ZX Microdrive by Andrew Pennell.