MSI 6800 - At the root of every good system

[extra: MSI6800_pcw_1979-06.webp|The System 1 variant of the MSI 6800 on the front cover of PCW, June 1979]The MSI 6800, from Midwest Scientific Instruments, was a Motorola MC6800-based system running at 2MHz on SWTPC's SS-50 bus.  It was first launched in 1977.

The MC6800 could nominally support 64K of memory, but because the MC6800 had no direct I/O lines, input/output had to be done through the system's memory, leaving an effective limit of 56K available to the user. 

The machine also appeared unusual in offering "STRUBAL" - a hybrid structured BASIC language, combining aspects of BASIC, PL/M and assembler.

Reviewed in June 1979's PCW, the MSI 6800 System 1 did quite well, with archetypal techno-nerd Stuart Danton, formerly a consutant with ICL Dataskil, writing that 

~"System One is a well composed piece of hardware.  It is well constructed, generously laid out and should give the potential owner reliable service"

He also noted that Hi-Fi enthusiasts might be concerned that disk access could cause some bleed-over on the FM radio band, which was actually detectable on a stereo.

The starting price for the 6800 was around £1,674, or around [[1674|1979]] in [[now]] - apparently this was "amongst the most competitive on the British market today"[source: "PCW Review: The MSI 6800 System One", Personal Computer World, June 1979, p. 35-38].

[picture: StrumtechMSI_percw_sep78.webp|An earlier 1978 advert from Strumtech Engineering, or Seed, showing its sole-importer status for MSI, but also that it was selling the SWTPC 6800 that the MSI 6800's SS-50 bus came from. Also available is a Soroc IQ 120 terminal at £699 ([[699|1978]] in [[now]]) which is more than the £565 price of the assembled MSI 6800 computer. From PCW, September 1978.]

The MSI 6800 also featured in some ground-breaking research undertaken at the Royal Postgraduate Medical School at Hammersmith Hospital in London.

In one project funded by a Department of Health and Social Security grant, the MSI was hooked up to an ultrasound scanner and used to study the movement of foetuses, and blood flow around the body. 

Software could analyse the ultrasound echoes to pick out information that was not directly visible.

Elsewhere, an MSI 6800 had replaced on old paper-tape-based system connected to a blood-testing Coulter Counter, which analysed over 500 samples per day.

The choice of the MSI was largely down to an engineer in the Child Health Department, Paul Collins, who had been experimenting with Motorola's 6800 chip "for several years" in work led by Professor Wootton, head of the Department of Chemical Pathology. 

The medical MSIs had been supplied by the same company as featured in this advert - Strumtech Engineering Electronic Developments, or SEED. 

SEED, of Walsall in the West Midlands, was said by the hospital to be "extremely helpful" in assisting with its various projects.

The work with the MSI also led to minicomputer supplier CTL making it an optional addition to its Phoenix medical package[source: "Whose hand rocks the cradle?", Practical Computing, January 1980, p. 56-57].

