https://github.com/bkw777/z88_rs232

Convert a Cambridge Z88 serial port to a standard serial port
https://github.com/bkw777/z88_rs232

Last synced: 25 days ago
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Convert a Cambridge Z88 serial port to a standard serial port

• Host: GitHub
• URL: https://github.com/bkw777/z88_rs232
• Owner: bkw777
• License: gpl-3.0
• Created: 2020-09-09T03:16:24.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2024-05-06T00:51:33.000Z (8 months ago)
• Last Synced: 2024-05-06T01:40:13.319Z (8 months ago)
• Language: Shell
• Size: 493 KB
• Stars: 3
• Watchers: 3
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Cambridge Z88 serial port adapters

## PC style

![](Z88_RS232_PC.jpg)  

![](Z88_RS232_PC.svg)

PCB: https://oshpark.com/shared_projects/w1GYezbu  

BOM: https://www.digikey.com/short/zfdrnv

Z88_RS232_PC converts the Z88 serial port to a PC style com port.  

DE9M with standard RS-232 DTE pinout.

This adapter is most convenient for using peripherals designed for use with a standard PC or USB-Serial adapter, or a 9-pin null-modem cable to a PC.

## "Model T" style

![](Z88_RS232_Model_T_1.jpg)  

![](Z88_RS232_Model_T_2.jpg)  

![](Z88_RS232_Model_T.svg)

PCB: https://oshpark.com/shared_projects/cCj4Skb4  

BOM: https://www.digikey.com/short/zfdrnz

Z88_RS232_Model_T converts the Z88 serial port to a "Model T" style serial port.  

DB25F with standard RS-232 DTE pinout.

This is not like most hosts or devices today, in that normally a DTE or host port is a male plug, but it's otherwise still conforming to the rs232 standard in that the correct rs-232 signals are on the correct pin numbers. It's only the female connector that's unusual.

"Model T" computers are: TRS-80/TANDY Models 100, 102, 200, 600, NEC Models PC-8201, PC-8201A, PC-8300, Olivetti M10, and Kyotronic KC-85. All of these machines have a DB25F connectore with a RS-232 DTE pinout.

This adapter is most convenient for using peripherals designed for use with "Model T" computers, for instance the Tandy Portable Disk Drive.

You could connect to a PC with this adapter too, by using the same slightly uncommon kind of cable that a "model T" would need.  

http://tandy.wiki/Model_T_Serial_Cable