I think the big problem is as John mentioned you need to grab the data from the address and data buses and output it to the LCD fast enough to complete the update before the next clock cycle.
Say you're talking about a 24-bit address and 16-bit data, in hex that is 10 characters. The part of the system talking to the LCD would have to update it at 120 Mhz in order to be able to update all 10 characters before the next clock cycle (and that's assuming that you can update 1 full character/clock). Most microcontrollers won't be up to that task.
I had a thought of making a nice LCD display with an 800x480 TFT panel for my N8VEM-ECB system, and using a microcontroller to write out the addres/data/and all the flags as text. But when you start looking at it, the responsiveness just isn't there to update the display fast enough.
For replacing the TIL311 displays, I have seen reference to DIP decoder chips that will decode 4 bits of binary into showing hex on standard 7-segment displays - 0-9 and A, lower case b, C, lowercase d, E, F. That's probably the best option for something that will remain readily available.... Or program a DIP PLD device.
On Monday, March 3, 2014 6:25:16 AM UTC-8, Gene Buckle wrote:
On Sun, 2 Mar 2014, Steven Feinsmith wrote:
> Sounds good to see this board improved. May I suggest you to consider
> change for display because TIL113 was no longer made and many vendors
> overcharged for each module. One vendor representative told me the TIL113
> components were in shortage and expect jack up the price.. I think it is
> not difficult to change into affordable LCD or OLED display from
> www.crystalfontz.com (or affordable display from eBay). So then it will
> give out more crisp display and capable to fit into the S-100 board.
There's a ton of cheap, multi-line, SPI or I2C (or even serial!)
addressable LCD displays out there thanks to the Arduino crowd.
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