These are copies of the collection of HP users' clubs' Swap Disks, which originated as CHHU Swap Disks. Please send any comments, suggestions &c to Tapani Tarvainen . The directory names reflect the original volume labels, and file names are as originally except that they've been converted to lower case, an extension indicating the file type has been added (see table below) and a few HP-41 files with special characters in them have been renamed (see list below). In addition HP-71 BASIC programs have been saved both in original, tokenized form (*.b71) and as text (*.t71), in order to allow viewing them before downloading to HP71 and possibly for use in other machines like the HP-75 (a few files couldn't be transformed, however). If any HP-75 owner would like to volunteer to do the same for HP-75 BASIC files, please let me know! (HP-41 programs could also be saved in ASCII form (listings) -- if there's enough interest I could do that. Let me know if you'd like that.) Filename extensions: txt HP-41 ASCII = HP-71 TEXT = HP-75 LIF1 (Note: these have been converted into MS-DOS text files with cr-lf-terminated lines. Some LIF1 files might be corrupted in this process (especially if they contain graphics data). If you find any such here, please notify tapani@iki.fi. Thank you.) d41 HP-41 data = HP-71 SDATA p41 HP-41 program k41 HP-41 key file s41 HP-41 status file w41 HP-41 write-all (WALL) file r41 HP-41 ROM file (RAMBOX WRTPG file) x41 HP-41 X-memory file (Ext IL ROM WRTXM) c41 HP-41 "calc" file (Ext IL ROM WRTCAL) b41 HP-41 buffer (Ext IL ROM WRTBUFX) b71 HP-71 BASIC t71 HP-71 BASIC transformed into text i71 HP-71 BIN d71 HP-71 DATA l71 HP-71 LEX k71 HP-71 KEY f71 HP-71 FORTH r71 HP-71 ROM g71 HP-71 GRAPH b75 HP-75 BASIC t75 HP-75 TEXT a75 HP-75 APPT g75 HP-75 GRAPH l75 HP-75 LEX w75 HP-75 WS r75 HP-75 ROM Filenames changed from original swap disks: disk original here CHHU04 CD^MS* cdtomsx.p41 CFRAME* cframex.p41 CHHU06 B2-BUF b2tobuf.p41 B2-BUFT b2tobuft.txt CD^MS cdtoms.p41 CD^MST cdtomst.txt SWAP09 ROM>DSK rom2dsk.p41 DSK>ROM dsk2rom.p41 H>D h2d.p41 D>H d2h.p41 AVIA 1A avia1a.r41 SWAP11 BCa/b1 bcapb1.p41 BCa/b2 bcapb2.p41