Ideal way to connect RS232 devices; Label Printers, Mobile Phones, Modems, Scanners, Digital Cameras, PDAs etc to a USB port.
USB specification revision 1.1&2.0 compliant
Supports Rs232serial interface(DB25 or DB9)
Supports over 1 Mbps data transfer rate
Supports remote wake-up and power management
Compatable with Windows98/SE/ME/2000/XP
Suitable for PDA and Modems
Price : £2.97
NB. CONTRARY TO THE AMAZON LINK, THESE DO NOT WORK WITH GARMIN
Price : £2.96
want to program sat boxes cable boxes well here is the answer the newlink null modem cable which can also be used on reciept printers and themal printers
Price : £1.70
This USB to Serial Converter allows any modern USB equipped computer to connect to devices equipped with 25 Way serial RS-232 ports. Ideal for EPOS process control lab equipment etc. Supports all standard serial devices USB 1.1 compliant "Plug & Play" Connectors: 25 Way D Male to USB A Male Adaptor No IRQ I/O address or DMA memory address needed Powered from USB Bus with no external power supply required Cable length: 1.5m Compatible with Windows 95(OSR2.1)98/ME/2000/XP/Vista/7 and Mac OS 8.6 and above 2 year warranty A full range of USB Converters and Extenders are available from LINDY.
Price : £18.94

Featuring the latest PL-2303HX Rev D chipset for the best combination of performance and wide driver support. Drivers available for Windows 98/ME/2000/XP, and Microsoft signed drivers for 32/64-bit Vista and Windows 7; Mac OS X 8 and later including Snow Leopard 10.6.x; open source drivers included in Linux kernel 2.4.31 and later. Windows 7 automatically detects and guide driver install without disk. Works with devices with RS-232 serial ports like: other PCs with RS-232 ports, Bluetooth serial adapters, PDAs, GPS recievers, routers, firewalls, modems, printers, embedded character displays, scan tools, sonar units, embedded boards, etc. Specific devices include: Garmin eTrex GPS, Seiko Label Printer, iRobot Create, Cisco products with serial consoles, US Robotics Modems, NexStar telescopes, Equus Scan Tools, Uniden Hand Held Scanners, etc. Works with software like: HyperTerminal, TeraTerm, WinDBG, all open source serial software on Linux, etc. Package Includes: USB Serial Converter, Driver CD, and Quick Installation Guide.
Price : £13.38

Need a Parallel port? If you want to use more than one printer, here is a simple answer. If you've got printers, scanners, external CD Rom drives, tape backups and webcams all wanting to use your printer port, take a look at this. If you have USB ports, and a USB capable system, you can add a printer port without even taking the cover off the system. System Requirements: Printer device with Standard 25-pin Male Parallel Port Available USB port on the computer Windows 98/Me/2000/XP For use with a parallel port printer, a printer cable is needed (it plugs into the adapter). Package Includes: USB-Parallel Printer Port Cable Suitable for most IEEE 1284 Centronics Printers - HP / Lexmark / Epson / Canon etc. Not suitable for Canon BJC-50 Not MAC Compatible We are unaware of any other known incompatibilities, but just in case we offer a no quibble refund if the cable is found to be incompatible. If you want to test the cable with your printer, you can, safe in the knowledge we will refund your money if it doesn't work! XP USERS DO NOT REQUIRE ANY DRIVERS. FULL INSTRUCTIONS SHOULD BE DOWNLOADED HERE. Please note this cable is for use with PRINTERS ONLY.It will not function as an LPT Parallel Port - only as a Parallel Printer Cable, i.e not for use with Scanners, Dongles or other 25 pin devices. Some 3 in 1 printers will print ok but may not scan. The cable will show up as USB not an LPT port.
Price : £3.00
ML33/55 Serial RS232C Interface
Price : £49.90
Simultaneously connect two RS-232 serial devices to your USB ready PC or Mac. Supports standard serial devices USB 1.1 Compliant Easy plug and play installation Connectors: USB A Male to 2 x 9 Way D Serial Male Supports remote wake up and power management Data buffers for upstream and downstream on each port Powered from USB Bus with no external power supply required Compatible with Windows 98/ME/2000/XP/Vista/7 (32 & 64 Bit) Mac OS 10.4 - 10.6 and Linux Warranty: 2 years
Price : £27.94
Supports WIN 98 / 2000 / XP / MAC OS V8.6 or higher
Price : £6.35