40 Results for "stebus"

Catalogue page
Log from STEbus Stepper Motor Controller
STMC The STMC uses an intelligent LSI controller which provides all the functions required to drive a stepper motor without intervention from the host computer. In addition, the STMC contains a 2 amp 4-phase driver IC with heatsink, to produce a complete...

Construction
Log from STEbus 65C02
My initial placement. I have the 32K RAM chips under the ROM sockets. This simplifies wiring a lot. They are directly soldered to the PCB, because they won't be changed and they are nowadays cheap enough to not bother recovering.On the right is...

PAL chips read
Log from STEbus 80C188
2019-02-22 JEDEC files for the two PAL chips arrived, thanks to Andy! 2019-02-23 JED files decompiled. A bit worried the pinout might differ from the manual I have (for a later version hardware). Partly a red herring, the decompiler produces expressions...

Project proposal
Log from STEbus Z8000
I propose starting from an existing CP/M-8000 machine project, which looks like this: My project proposal is to construct on a Eurocard (160x100 mm)replace multiple TTL chips with GAL chipsadd a FIFO-interface USB module (replacing the Z8530 UART...

Project Log
Log from STEbus 68B09E
2019-05-30 I'd been putting this project off for a while because it is very complicated to get fully working and I have no known-good firmware specifically for it. I considered porting a monitor but a BASIC interpreter would be more impressive. Grant...

PCB layout
Log from STEbus backplane
The connector side is almost entirely covered with copper, which is the ground plane for all bus signals. This is essential, because it ensures every signal has identical controlled impedance. The STEbus specification states: 7.6.2 Characteristic Impedance...

Altera Quartus
Log from Skills set
In 2001 I chose to go with Xilinx chips and design tools, because they are based on the same ordinary silicon technology used to make RAM chips and microprocessors. Infinitely reprogrammable and presumably cheaper than non-volatile technology. I learnt...

Project journal
Log from STEbus Z180 slave board (SP180)
2024-01-20 I've just found and bought this board from eBay. Made by DSP Design Ltd. It uses the 7-thou pitch DIL packaged device (ugh!) which can only access half the memory of the PLCC68 version. I don't expect this to come with a manual or circuit...

The SGT1
Log from STEbus 6845/6803 video board
The SGT1 was an STEbus colour graphics video board based on the 6845 with a 6803 microcontroller and 64K of DRAM. The 6803 drew text characters on the pixel graphics display. It was quickly superseded by more advanced video boards, and the hardware...

False starts are sometimes the best starts....
Log from HB6809 Homebrew computer
So it has been a long time since the last update, but here goes.... So I built up the Grant Searle / Jeff Tranter Single board 6809 computer on a breadboard: If you haven't checked out the minimal 6809 on their sites its a good read both of them,...

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