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From the ASCII text in the firmware, I believe this board came from an OS-9/68000 system made by VG Elemental, and a product called the PlasmaQuad.
https://www.precisionglassblowing.com/product/vg-plasmaquad-2/
VG Elemental seem to have been absorbed by Thermo Scientific.
The SC68000 is a low power CMOS CPU for STEbus, based on an 8- or 16 MHz 68000, with extensive on-board memory for optimum performance. This provides a powerful foundation for implementing real-time systems, additionally offering a straightforward upgrade path for users of the SC008 68008-based CPU (with an approximate four-fold speed increase).
The board comes with up to 256 Kbytes of zero wait-state battery-backed static RAM, and two sockets to house up to 512 Kbytes EPROM configured for the 68000's 16-bit wide data bus.
Two serial ports are provided by a 68681 UART, these can be configured as RS232 channels or as one RS232 and one RS485 channel. Utility functions include a battery-backed real-time clock and a software watchdog timer. Interrupts can be generated from the UART, real-time clock, and any of the STEbus' attention request lines (with connections via jumpers for flexibility).
The boards interface to the STEbus supports word accesses, allowing users to run the 68000 in 16-bit mode for optimum performance. System Clock and Reset facilities are provided, and the CPU can act either as a single permanent master or in a default/potential master mode for multi-processing.
Four LEDs are provided; one wired to indicate CPU Run/Halt status, the others are user-configurable and are driven by the UART. Software support includes the OS-9/68K operating system, together with drivers for a complete range of IO and expansion boards.
STEbus permanent master or default/potential master mode.
Typ 800mA @ 5V, 30mA @±12V
SC68000-8 8 MHz 68000 CPU, 64Kb SRAM SC68000-81 8 MHz 68000 CPU, 128Kb SRAM SC68000-82 8 MHz 68000 CPU, 256Kb SRAM SC68000-16 16 MHz 68000 CPU , 64Kb SRAM SC68000-161 16 MHz 68000 CPU, 128Kb SRAM SC68000-162 16 MHz 68000 CPU, 256Kb SRAM SC68000CM-8 8 MHz 68000 low-power CPU, 64Kb SRAM SC68000CM-81 8 MHz 68000 low-power CPU, 128Kb SRAM SC68000CM-82 8 MHz 68000 low-power CPU, 256Kb SRAM SC68000CM-16 16 MHz 68000 low-power CPU, 64Kb SRAM SC68000CM-161 16 MHz 68000 low-power CPU, 128Kb SRAM SC68000CM-162 16 MHz 68000 low-power CPU, 256Kb SRAM
I've got a bit further analysing the equations than the files uploaded on the 13th March, but for some reason I am unable to upload files as of now.
The 68008 board PAL chips provide good hints about the logic.
The 68000 logic seems to be complicated by the fact the data bus interface is neither 8-bit (like the 68008) nor can it be made so by dynamic bus sizing (like the 68020).
Instead, the logic appears to generate two 8-bit STEbus cycles for every 16-bit CPU cycle.
One of the bytes is temporarily held in a latch (a 74ACT646) while the other passes through a buffer (a 74ACT245). These present two bus loads that are in total probably less than one LS TTL load.
2022-02-19
Spotted one for $220. Bought it. Works out to be $327.22 or £240.77 after import duty and postage. Not cheap but STEbus evangelism is my bag. Due to arrive in March, when I shall read its programmables!
According to https://core.ac.uk/reader/82231630
The new VG PlasmaQuad 3 system is the "highest performance quadrupole ICPMS ever built, and the most automated" claims the company. It introduces a range of new features, including a fully automated dual-mode plasma torch designed to operate in the standard mode for the majority of elemental determinations, and in a cool plasma mode for the determination of selected elements; the "S" option interface to dramatically increase sensitivity allowing routine determination of sub ppq levels; Super-Quant to automatically provide accurate, interference-corrected concentrations; and, AutoRange plus, an advanced detector system providing a linear dynamic range of eight orders of magnitude, increases accuracy and productivity.
Keith
Steven