Quadros offers two versions of RTXC. Although RTXC 3.2 predates RTXC Quadros, it supports a wider range of processors, including those at the low end of the spectrum, such as the 8-bit Hitachi H8S and the Motorola HC12. RTXC Quadros provides a more advanced, modular architecture that integrates multiprocessor features and different stack configurations. Both have similar application programming interfaces (APIs) and work with RTXCNet, the networking module for RTXC. Designers should select RTXC Quadros if it handles the target platform, as its modular configuration makes enhancements and upgrades easier.
RTXC is written in C with a little assembler on the side. Its low execution overhead is designed for fast context switches with minimum latency.
Version 3.2 packs a lot into a small footprint. It also incorporates services like memory partitioning to compartmentalize and conserve memory use.
Quadros didn't reduce its toolset when it minimized RTXC's memory footprint. Rather, the SYSgen configuration utility has full kernel customization.
RTXCNet handles Ethernet, SLIP, and PP interfaces. It comes with a wide range of IP-based applications, including a Web server, DHCP server, and even network address translation (NAT) support for building a router. Services are optimized to conserve RAM and ROM.
Debugging is provided through RTXCbug. Though it runs as a task, it's typically idle, consuming no processor overhead. This feature can show the state of kernel objects and relationships to other objects.
RTXC 3.2CompanyQuadrosWeb sitewww.lineo.comArchitecture8-, 16-, and 32-bitProcessor familiesOver 20 total, including the Philips 8051XA, Hitachi H8S, PowerPC, ARMSchedulingPriority, time slicing, round robinMessagingYesServicesMemory management, timers, queues, semaphoresDevice driversYesFile systemYesMinimum footprint0.5 kbyteGraphicsNoneNetworkRTXCNetDebuggingRTXCbug, serial, JTAGTracingoneRoyaltiesoneSource codeProvidedLanguagesAssembler, C