The remaining stock of QL parts were purchased from Sinclair, and the standard QL motherboard (including a 7.5 MHz Motorola 68008 CPU and 128 KiB of RAM) was augmented with a CST-designed expansion board providing 512 KiB of additional RAM, extra ROMs, a non-volatile real-time clock, floppy disk, SCSI, Centronics parallel, IBM PC/AT-style keyboard and mouse interfaces enclosed in a low-profile metal desktop case with a built-in power supply.
The Thor XVI[9][10][11] was developed in collaboration with the Danish company DanSoft and was announced at the Personal Computer World Show in September 1987.
Floppy disk, SCSI, Centronics, dual S5/8 serial ports, PC/AT keyboard, mouse, QL expansion bus and QLAN network interfaces are provided.
Mass storage options are similar to the previous Thors, plus 40 MB hard disk and diskless network workstation configurations.
The Thor XVI includes in ROM a QDOS-compatible operating system derived from QDOS 1.13, called Argos.
The following year, Thor International (and CST) collapsed amid acrimony and legal action over the disputed transfer of assets from the UK by the partners.