104 Results for "stebus"

Sourcing
Log from STEbus 68000
2022-02-19Spotted 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!

STEbus system controller
Details from STEbus system controller
Features:Voltage monitors for 5V, 12V and -12V supply railsLCD interfaceSTEbus arbiterCentronics printer interfaceThese features allow the board to monitor bus health, display it, and record it on a printer. It can reset the system and switch an alarm...

Catalogue page
Log from STEbus 6845/6803 video board
STEbus Colour Graphics and Text SGT1 The SGT1 brings high-resolution colour graphics to the STEbus. Graphics and text can be mixed on the screen, and the on-board 6803 processor with 64 kbytes of RAM and a 6845 CRTC deals with graphics generation and...

Programmable logic
Log from STEbus Servo Motor Controller
The STEbus writes output port bytes to an edge-triggered latch, and reads input port through an 8-bit buffer. The STEbus writes command bytes to an edge-triggered latch.The microcontroller writes response bytes an edge-triggered latch.The actions set...

SC130 experiments
Log from STEbus Z180 board
I originally had the idea of making a Z180 to Z80 adaptor and then plugging the Z80 side into an STEbus Z80 board. Really inelegant and I suspect it would have added unreliability even if the idea was sound.

Disk drives
Log from STEbus 486DX PC AT Compatible Board
My STEbus rack already has a 3.5" floppy drive, and spare power connectors for hard drives.Amazingly, I found I still had a set of 3.5" floppies with MSDOS 5 and Windows for Workgroups v 3.11 so that's a start. I have a 3.5" floppy drive and a spare...

Key points of backplane design
Log from STEbus
A ground plane is essentialFlood-filled copper pours do not count as a ground planeSTEbus boards are allowed up to 4 amps at 5VSTEbus backplanes carry up to 20A (5 slot), 40A (10 slot) or 84A (21 slot)This requires many threaded terminals, 2 per slot....

BT Engineering magazine article: 68000 board
Log from STEbus Z180 slave board (IPI)
British Telecommunications Engineering Volume 6 Part 4 page 284 68000 STEbus Processor A new high-performance CPU card from British Telecom Microprocessor Systems offers designers exceptional processing power on an extremely cost-effective bus — STE....

STEbus FPGA board
Details from STEbus FPGA board
I started this page as a placeholder in 2018, but lacked the time to implement it. In 2021 Benoit told me that he had implemented such a project. Glad to see my evangelical work has encouraged others to adopt STEbus!The project so far is Benoit's...

The Retrobrew VDU board
Log from STEbus 6845/6803 video board
Another 80-column text-only board. https://retrobrewcomputers.org/doku.php?id=boards:ecb:vdu:start I heard of an ECB-to-STE bus interface, though this is not published on the web.If it exists, it would be a handy way of prototyping STEbus versions of...

IPI Monitor software
Log from STEbus Z180 slave board (IPI)
The 32K EPROM has a monitor in the first 1400h bytes, and the rest is just blank (FFh).The software comes in three versions, communicating through a Z80 FIFO, single-byte latch, or serial port. Monitor versions are available for different default console...

6803 based computer
Details from 6803 based computer
The MC10 is based on the 6803 and the 6847. The 6803 is a 6800 with extra i/o and instructions. The MC10 firmware uses the extra instructions often. I used a 6811 assembler and made a file that assembles but I have not checked to output against...

Finalized on Bus
Log from Zara80
I began laying out my modified RC2014 bus and I realized it has more problems than just missing signals. There's not termination, layout is not friendly to cross coupling concerns, etc. It's a great breakout for a z80 but it's a badly designed...

Clock stretching
Log from STEbus 68B09E
The designer told me that this board was far harder to design than more advanced processors like the 68020. It stretches the clocks for various reasons:Memories of different, but fixed, speeds.STEbus access of unknown speed.I/O chips that require fixed...

Timing explained
Log from STEbus I/O prototyping board
The STEbus was defined in the early 1980s, when a typical bus cycle for a processor and its support chips was about 1 microsecond. A 4 MHz Z80 took 3 or 4 clock ticks, and 8 MHz 68000 took 8 clock ticks. Memory chip speeds were about 300 to 450 ns, so...

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