There is now a new version of the HPCC schemaitcs CD-ROM. This one contains schematics for around 140 classic computer devices, I'll put a full list at the end of this message. As with the older disks, the schemaitcs are hand-drawn (by me). You will ahce to put up with my writing :-). There;s very little apart from the schematics, there are no isntruction o ntaking the things apart, no theory-of-operation information, and so on. In some cases the HP service manual is avaialble on-line, and will contain some of that information. All profits go to HPCC (Handheld and Portable Computer Cluh). To order the disk (I believe it's now 2 CD-ROMs or 1 DVD-ROM), please contact Dave Colver, sectretary at hpcc.org, who can tell you the price, etc And now for the machines chargers/eramco_pp Portable Plus car charger (Eramco) chargers/hp82028 chargers/hp82054 Car charger chargers/hp82055 Woodstock car charger desktops/hp110 `Portable' desktops/hp120 CP/M machine desktops/hp120key Notes on making a keyboard for the HP120 desktops/hp50960 SRM server desktops/hp86b desktop computer, external video monitor desktops/hp87 HP87 and HP87XM desktop computers desktops/hp9100b First generation RPN desktop desktops/hp9810 Second generation RPN desktop desktops/hp9815 RPN desktop calculator desktops/hp9816 68000-based computer with internal monitor desktops/hp9817 68010-based 'shoebox' desktops/hp9820 First Algebraic desktop desktops/hp9825 First HPL desktop (also covers 9831 BASIC desktop) desktops/hp982636 HP9826 and HP9836 68000 computers desktops/hp9830 First BASIC desktop desktops/hp9845b Desktop Computer, Opt 200 High speed language processor desktops/hp9915 Industrial control computer (based on HP85) desktops/integral Portable unix machine handhelds/classic/hp35 First handheld scientific handhelds/classic/hp45 Second handheld scientific handhelds/classic/hp55 Scientific with timer handhelds/classic/hp65 First handheld programmable handhelds/classic/hp67 Handheld programmable handhelds/classic/hp70 Simple financial handheld handhelds/classic/hp80 Financial handheld handhelds/hp48sxKeyboard HP48SX keyboard matrix handhelds/printing_classic/hp46 Printing 45 handhelds/printing_classic/hp81 Printing 80 (with many more functions) handhelds/spice/hp32e Non-continuous memory Spice (other 3xE are similar) handhelds/spice/hp33c Continuous memory Spice (other 3xC are similar) handhelds/sting/hp10a Printing adding machine handhelds/sting/hp19c Programming printing calculator handhelds/topcat/hp91 Printing scientific calculator handhelds/topcat/hp92 Printing financial calculator handhelds/topcat/hp95c Never-released printing programmable calculator handhelds/topcat/hp97sio I/O module part of HP97S handhelds/voyager/hp16c Programmer's calculator handhelds/woodstock/hp21 Scientific calculator handhelds/woodstock/hp22 Financial calculator handhelds/woodstock/hp25 Programmable calculator handhelds/woodstock/hp25c Continuous memory programmable calculator handhelds/woodstock/hp27 Financial and scientific calculator handhelds/woodstock/hp29c Continuous memory programmable calculator peripherals/dio/hp50962 DIO SRM Coax interface peripherals/dio/hp98204a DIO TV-rate video interface peripherals/dio/hp98204b DIO Video board (including graphics) peripherals/dio/hp98256 DIO 256K RAM PCB peripherals/dio/hp98257 DIO 1M RAM PCB peripherals/dio/hp98259 DIO 128K Bubble memory PCB peripherals/dio/hp98261 DIO ROM PCB peripherals/dio/hp98604 ROM HPL PCB for HP9000/200 machines peripherals/dio/hp98620b DIO DMA controller peripherals/dio/hp98622 DIO GPIO board peripherals/dio/hp98624 DIO HPIB Interface peripherals/dio/hp98626 DIO RS232 Interface peripherals/dio/hp98628 DIO RS232 Interface (Z80 controlled) peripherals/dio/hphil DIO HP-HIL/HPIB interface peripherals/dio/kbd9920 HP9920 keyboard interface/HPIB PCB peripherals/dio/kgmram KGM 1M DIO RAM board peripherals/dio/wkbp4a 3rd party 256K DIO RAM board peripherals/hhp_eprom EPROM box for HP41 peripherals/hp11202 8 bit parallel interface for HP98x0 peripherals/hp11203 BCD interface for HP98x0 peripherals/hp11205 RS232 interface for HP98x0 peripherals/hp11206 Modem interface for HP9830 peripherals/hp11284 Datacomms interface for 9830 peripherals/hp11336 Printer interface (HP9871) for HP98x0 peripherals/hp13264 Data link interface peripherals/hp13267 First multipoint interface peripherals/hp2671g HPIB Thermal printer peripherals/hp27201 HPIB extender peripherals/hp2748a Optical paper tape reader peripherals/hp35731 Monochrome monitor for HP9000/200 machines peripherals/hp46020 First type HP-HIL keyboard peripherals/hp46021 Second type HP-HIL keyboard peripherals/hp5055 Digital Recorder (strip printer) peripherals/hp59301 HPIB parallel interface peripherals/hp59304 HPIB remote display unit peripherals/hp59306 HPIB relay actuator peripherals/hp59308 HPIB timing generator peripherals/hp59309 HPIB digital clock peripherals/hp59401 HPIB analyser peripherals/hp59403 HPIB common carrier interface peripherals/hp59405 HPIB interface for HP9830 peripherals/hp59500 HPIB interface for HP6940 multiprogrammer peripherals/hp6940b Multiprogrammer peripherals/hp7245a Thermal printer/plotter peripherals/hp7440hpib HPIB ColourPro plotter peripherals/hp7470opt003 HPIL Plotter peripherals/hp7475 HPIB Plotter peripherals/hp7959b HPIB hard disk unit (ESDI drive) peripherals/hp82104 Card reader for HP41 peripherals/hp82143 Dedicated thermal printer for HP41 peripherals/hp82153 Barcode Wand for HP41 peripherals/hp82162 HPIL thermal printer peripherals/hp82168 HPIL modem peripherals/hp82440a IR thermal printer peripherals/hp82440b IR thermal printer peripherals/hp82901 Dual 5.25" disk drive peripherals/hp82905 Dot matrix printer (either HPIB or HPIL) peripherals/hp82985 Portable Plus video interface peripherals/hp9114a HPIL disk drivc peripherals/hp9114b HPIL disk drive peripherals/hp9121 Single-sided 3.5" HPIB floppy drive peripherals/hp9122 Double-sided 3.5" disk drive peripherals/hp9123 HPIB floppy drive for the HP150-II peripherals/hp9125a Plotter for HP9100 peripherals/hp9133h HPIB hard/floppy disk unit peripherals/hp9133vxv HP913V, HP9133XV hard/floppy disk units peripherals/hp9154b HPIB hard disk unit (Nighthawk drive) peripherals/hp98033 BCD interface for HP9825 peripherals/hp98034 HPIB interface for HP9825 peripherals/hp98035 Real time clock module for HP9825 peripherals/hp98036 RS232 interface for HP9825 peripherals/hp98133 BCD interface for HP9815 peripherals/hp98134 GPIO interface for HP9815 peripherals/hp9862if Plotter interface (only) for HP98x0 peripherals/hp9865 Cassette drive for HP98x0 -- Interface ONLY peripherals/hp9866 Thermal printer for 9800-series peripherals/hp9877 External tape drive for HP9825 peripherals/hp9878 Expansion chassis for HP9825 peripherals/hp98780 Enhanced mono monitor for HP9845B peripherals/ipc/hp82904 Expansion interface for Integral peripherals/ipc/hp82915 Modem PCB for Integral peripherals/ipc/hp82916 RAM PCBs for Integral peripherals/ipc/hp82919 RS232 interface for Integral peripherals/ipc/hp82971 ROM/EPROM module for Integral peripherals/mp/hp69321b 12-bit voltage D/A for multiprogrammer peripherals/mp/hp69330a Relay output for multiprogrammer peripherals/mp/hp69351 Voltage regulator for multiprogrammer peripherals/mp/hp69422a High-speed A/D for multiprogrammer peripherals/mp/hp69431a Digital input for multiprogrammer peripherals/mp/hp69502a Resistance program for multiprogrammer peripherals/paintjet Colour inkjet printer peripherals/rsu Eramco MLDL unit for HP41 peripherals/rsu2 Eramco MLDL for HP41 (card reader case) peripherals/wand75d Wand for the HP75D -tony