Intel 8085 project, a few questions.

nsaspook

Joined Aug 27, 2009
13,079
Yay I got it working :)

Looks like I'm eating my words, it was a software issue. I just had to write a few instructions to make sure the buffer had room to store the next character. Hopefully I won't have to bother you with any more posts XD

Thank you so much for all of your help and suggestions. I've attached a picture for anyone interested.
Sweet. I dug into the junk pile and found some parts from that era (1978) of a system I made to interface with a old Teletype corp model 15. 8080 and Z-80 processors with a version of PILOT I wrote as the programming language. It was a training device prototype.

http://www.flickr.com/photos/nsaspook/sets/72157624642509553/show/

http://en.wikipedia.org/wiki/PILOT

It would have been nice to have a fancy LCD display instead of a 50lb monster.

http://www.baudot.net/teletype/M15.htm


 

Thread Starter

BlackCow

Joined May 11, 2009
65
That thing is beautiful :D

The LCD screen is nice but a bit small, I was thinking of having that as a secondary display and using an RS232 terminal for the main interface. Luckily I have this guy for more screen space, some old guy gave it to me XD

I'm not sure how old it is, but its certainly older than me! Clearly I was born in the wrong era of computing :)
 

nsaspook

Joined Aug 27, 2009
13,079
That thing is beautiful :D

The LCD screen is nice but a bit small, I was thinking of having that as a secondary display and using an RS232 terminal for the main interface. Luckily I have this guy for more screen space, some old guy gave it to me XD

I'm not sure how old it is, but its certainly older than me! Clearly I was born in the wrong era of computing :)
Once you complete the usart interface hardware you should be able to run that at full speed using a ISR on the receiver interrupt and reading the status register for transmit.
Your CRT reminded me that I have in my own "Warehouse 13" a TEK 4205 serial graphics terminal that would make a perfect monitor for my solar project.

http://farm5.static.flickr.com/4119/4911408380_3580a967ce_b_d.jpg

http://www.xmission.com/~legalize/vintage/docs/tektronix/070-4527-02_4105_Computer_Display_Terminal_Operators_Manual_Apr1985.pdf
 
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