schematic usb to rs232 & usb to lpt

[tps_star]

usb to rs232 schematic

hello
i need schematic and pcb and firmware for the best convertor usb to rs232 and usb to lpt(25pin femail)
thancks

 

[blueroomelectronics]

rs232 to usb schematic

Much cheaper just to buy one. They don't work for programmers but only for printers.

 

[mcelab]

usb rs232 schematic

hello
i need schematic and pcb and firmware for the best convertor usb to rs232 and usb to lpt(25pin femail)
thancks

you can look for more detail in this link

https://www-user.tu-chemnitz.de/~heha/bastelecke/Rund um den PC/USB2LPT/

 

[tps_star]

usb to lpt schematic

thancks
please giveme other link for schematic usb to rs232