Hello! I got a fun project for you guys
I have a TRS-80 Model III and if you guys remember TRS-80s, some had RS232 serial communication cards with UARTs. Unfortunately, my TRS-80 is a base model so it has no RS332 serial communication card. I would like to add one for convenience in file transfer since floppys are getting more and more obsolete. I understand I could find the original Radio Shack RS232 card on ebay but at this moment theyre pretty expensive. So what I want to do is either make my own or modify an old say, PC UART card. (Plus who knows if the originals still work most of the time)
I was debating on whether to build my own when a friend gave me an old PC serial communication card. I would like to try and modify it to work if possible. Its a Mouse Systems Corp 301035-001 REV C UART card. I looked it up and didnt find much information about it.
(I couldnt fit all my information and photos on here so please visit the link to my blog and read the latest post)
Blog post link
Assuming you read the blog post, here are my questions. I need help figuring out how to connect this safely to my TRS-80. I assume I can just hook up the data lines the way they are, connect the clock output line to the clock section of the PC UART board, and hook up both resets the way they are as well. If all is correct there, then that leaves me with the interrupt lines, the address lines, and the RS232 I/O lines on the TRS-80 end. Then I could just pull up/down the unneeded pins with resistors.
Sorry it's really messy,
Any help would be greatly appreciated!
Note: due to size limits I cannot attach the TRS-80 III service manual but it can be found here if needed: model iii service manual (1980)(radio shack)(pdf).zip
I have a TRS-80 Model III and if you guys remember TRS-80s, some had RS232 serial communication cards with UARTs. Unfortunately, my TRS-80 is a base model so it has no RS332 serial communication card. I would like to add one for convenience in file transfer since floppys are getting more and more obsolete. I understand I could find the original Radio Shack RS232 card on ebay but at this moment theyre pretty expensive. So what I want to do is either make my own or modify an old say, PC UART card. (Plus who knows if the originals still work most of the time)
I was debating on whether to build my own when a friend gave me an old PC serial communication card. I would like to try and modify it to work if possible. Its a Mouse Systems Corp 301035-001 REV C UART card. I looked it up and didnt find much information about it.
(I couldnt fit all my information and photos on here so please visit the link to my blog and read the latest post)
Blog post link
Assuming you read the blog post, here are my questions. I need help figuring out how to connect this safely to my TRS-80. I assume I can just hook up the data lines the way they are, connect the clock output line to the clock section of the PC UART board, and hook up both resets the way they are as well. If all is correct there, then that leaves me with the interrupt lines, the address lines, and the RS232 I/O lines on the TRS-80 end. Then I could just pull up/down the unneeded pins with resistors.
Sorry it's really messy,
Any help would be greatly appreciated!
Note: due to size limits I cannot attach the TRS-80 III service manual but it can be found here if needed: model iii service manual (1980)(radio shack)(pdf).zip