Machine code software which used the officially documented entry points ('hook codes') would experience few incompatibility issues however, programs using non-standard entry points risked incompatibility due to the presence of revised entry points. These aimed to improve ZX Microdrive cartridge formatting and access time, printing functions via the RS-232 interface, and other bugs in the firmware held in the device's internal 8K ROM. Two further revisions of the device's firmware were made following launch. As this became an official standard, other developers quickly used this mechanism to create language extensions to Sinclair BASIC. This extended the error handler in the Sinclair BASIC to allow extra keywords to be used. This led to problems when receiving data, but not when transmitting.Ī wedge-shaped device fitting underneath the ZX Spectrum, the ZX Interface 1 contained 8 kB of ROM comprising the control software for the Microdrives, an RS-232 port and network interface.
SINCLAIR ZX SPECTRUM HEAT LEADER SERIAL
At hardware level it was fundamentally a voltage adaptor, the serial protocol being implemented in software by bit-banging. It also included a DE-9 RS-232 interface capable of operating at up to 19.2 kbit/s. Originally intended as a local area network interface for use in school classrooms, it was revised before launch to also act as the controller for up to eight ZX Microdrive high-speed tape-loop cartridge drives. The ZX Interface 1 with the ZX Microdrive connectedĪ peripheral from Sinclair Research for its ZX Spectrum home computer, the ZX Interface 1 was launched in 1983.
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