Projekt URSO180 RetroModern x80-System: Unterschied zwischen den Versionen

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The {{URSO180}} tries to provide 2 5/6-pin headers  where standard FT232-based USB-serial-adapters can be plugged into. Therefore I tried to determine the most common pinout that allows to plug the USB-serial modules to the edge of the {{URSO180}}-board.
The {{URSO180}} tries to provide 2 5/6-pin headers  where standard FT232-based USB-serial-adapters can be plugged into. Therefore I tried to determine the most common pinout that allows to plug the USB-serial modules to the edge of the {{URSO180}}-board.
In the following table there are a number of pinouts to be compared side-by-side
In the following table there are a number of pinouts to be compared side-by-side
The examples are:


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| 2 || {{ServerImage|FTDI-cable-pinout-diagram-002.jpg}} || [https://microcontrollerslab.com/ftdi-usb-to-serial-converter-cable-use-linux-windows/ Board]
| 2 || {{ServerImage|FTDI-cable-pinout-diagram-002.jpg}} || [https://microcontrollerslab.com/ftdi-usb-to-serial-converter-cable-use-linux-windows/ Board]
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The pinouts are:


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{{TableBegin}}

Version vom 13. Mai 2021, 13:29 Uhr


URSO180 is the Project to build an 8-bit-Computer like in the days when we could understand all the inner workings of our computer.

However, URSO180 uses more modern technology in order to make the most out of the 8-bit experience. As an aside, this also strives to take out the nuisances that made life more complicated in the early years of DIY-micro-computing.

Intention

A role-model from the early years was and still is the Altair 8800. The Altair started as the minimal computer. It does put nothing of the abstraction layers of more complicated systems between the user and the inner workings.

The Role Model

The Altair has:

  • A minimal 8080 (optionally Z80) processor board
  • straight, honest static memory
  • NO bootstrap monitor that has to be able to run BUT:
  • a hardware-based front panel with switches and LEDs to provide functions for
    • examining and modifying memory contents
    • start and run machine language programs
    • halt and single step program execution

The Pupil

URSO180 will have:

  • Hitachi HD64180 Processor
    • internally a Z80, providing software-compatibility with the largest 8-bit community, including professional-level systems like CP/M
    • 10MHz clock frequency
    • a built-in MMU - Memory Management Unit allowing addressing up to 1 MByte of memory
    • 2 serielle Ports für Terminal und andere Peripherie
    • Lagerort: PUCONBOX008204 - Reihe --- - Fach ---
  • 1 MByte static RAM
  • up to 512 kByte EPROM/FlashROM for
    • Bootloader
    • Monitor
    • ROM-Disk für CP/M
    • ... etc ...
  • a front panel like that of the Altair
    • shall have the same functionality like that of the Altair
    • BUT: Logic in an FPGA
    • AND: operation not only by switches and LEDs but by additional logic
    • ADDITIONALLY: providing for sort of a Console Processor , bringing more comfort like:
      • more comfortable means as Hex-Keyboard and Dot-Matrix-Display
      • upload / download interfaces to PC
      • automating boot-load-procedures
  • storage adapter to SD-cards and USB

Additional Inspiration and Input

When scouring the Web for more detailed information about Z80- and Altair-look-alike-Computers, I found to my delight that I'm by no means the only crazy nerd to build such a thing!

There are a number of people having done extremely thorough work and published it too:

  • Ben Ryves built bis Z80-Computer Mark 2 with really clever hardware, even including Video output and PS/2 keyboard support. The Mark 2 does not have a front panel with switches and Blinkenlights but sort of a console processor allowing the Z80 to start from scratch without needing (EP)ROM code, similar to the intentions of URSO180

The Hardware

I chose to check out EasyEDA to develop the schematics and possibly even a PCB for the URSO180.

The URSO180 Page is at https://easyeda.com/scherer3002/URSO180-XXwWUgecx.

Serial Interfaces

The HD64180 has 3 serial ports, 2 of them can be used in the common UART mode.

The URSO180 tries to provide 2 5/6-pin headers where standard FT232-based USB-serial-adapters can be plugged into. Therefore I tried to determine the most common pinout that allows to plug the USB-serial modules to the edge of the URSO180-board. In the following table there are a number of pinouts to be compared side-by-side

The examples are:

Number Image Link
1 Cable
2 Board

The pinouts are:

Pin Number Pinout 1 Function
 Pinout 2 Function
 Pinout 3 Function
1 GND GND
2 CTS CTS
3 VCC VCC
4 TXD TXD
5 RXD RXD
6 RTS DTR

The Pin Functions are:

(ANN: The Names of the Adapter-Pins are according to the RS-232 / ITU V.24 Specification, the adapter is in the DTE (Data Terminal Equipment) Role, TXD, DTR, RTS are outputs from the adapter, RXD, DSR, CTS, DCD are inputs

Function Name Direction Description
GND Adapter -> URSO180 Ground, common reference for signals and supply voltage
CTS URSO180 -> Adapter Clear To Send
VCC Adapter -> URSO180 Supply Voltage Output, taken from USB
TXD Adapter -> URSO180 Transmit Data
RXD URSO180 -> Adapter Receive Data
CTS Adapter -> URSO180 Clear To Send

Project Files


... to be continued ...

Abgerufen von „http://scherer3002.duckdns.org/wiki/index.php?title=Projekt_URSO180_RetroModern_x80-System&oldid=3214“