LEGACY CONTENT
This page is retained for reference but is no longer actively maintained. Some information may be out of date.
This page is retained for reference but is no longer actively maintained. Some information may be out of date.
Expansion Systems (ii)
This page is for ZX Spectrum devices which do not quite fit into the first Expansion Systems page. At this time there are just two items, the Currah μSource, and the Skywave Software Forth IO Cartridge. More items and categories may be entered on this page in the future.
Forth Cartridges
Features
Original Price
Skywave Software Spectrum Forth IO Cartridge
A ROM cartridge containing 12K of fig-FORTH, RS232 interface via an 8251, and 24 bits of parallel I/O via an 8255.
The BASIC ROM is switched out and replaced by the Forth ROM.
Features a Z80 assembler for machine code FORTH definitions; a built-in terminal to support a modem and allow access to bulletin-board systems; a machine code monitor which can operate in any number base; RS232 and Centronics printer routines, usable from FORTH or BASIC; RAM disc simulation and support of Microdrives.
Has a standard DB25 RS232 connector for the serial I/O and a strip cable connector for the parallel I/O.
Suitable for both 16K and 48K ZX Spectrum.
The BASIC ROM is switched out and replaced by the Forth ROM.
Features a Z80 assembler for machine code FORTH definitions; a built-in terminal to support a modem and allow access to bulletin-board systems; a machine code monitor which can operate in any number base; RS232 and Centronics printer routines, usable from FORTH or BASIC; RAM disc simulation and support of Microdrives.
Has a standard DB25 RS232 connector for the serial I/O and a strip cable connector for the parallel I/O.
Suitable for both 16K and 48K ZX Spectrum.
£49.951
Currah μSource (micro-Source)
ROM cartridge contains an implementation of Forth 79, an assembler, and a debug monitor.
Compatible with ZX Interface 1 and Microdrives2.
Compatible with ZX Interface 1 and Microdrives2.
£44.503
References
1. "Going FORTH" - article, ZX Computing, October/November 1983, p.612. "HARDWARE" - article, ZX Computing, February/March 1986, p.14
3. Currah μSource advert, Your Spectrum, No.9, November 1984, p.89
External Links
Checking the Currah microsource (U-Source) on Youtube.
Last revision : 30/06/2024
Page Revised: 25/10/2026