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Very long message multiplexing

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Asok Sankar Rudra

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Very long message multiplexing
Dear Members,
Be it alpha-numeric LCD or say 7 rows 48 colums LED dot matrix,I have probably a common problem.I can scroll relatively small messages quite good.But if the number of characters increases I fall short of RAM.I thought it to be normal and I was wrong.From market,a AT89C2051 and AT93C66 combination can display about 250 characters continuously.And my software(for AT89C2051 and AT24Cxx) zerks after about 90 characters because after that stack starts and I have to refresh the ram.
Kindly explain again how to display say 500 or 999 characters stored in external serial eeprom while I will migrate to a memory mapped board,add a ram to a AT89x52,and try my last code for external RAM
Regards.
A.S.Rudra
(I can imagine a large circular track and a train of the same length is moving continuously on the track.Just before the train enters the platform(SERIAL EEPROM) a passenger jumps out of the train and every time the train leaves the platform a new passenger enters the train.The passengers stand in line. We can see most of the passenger through the windows;invisible passengers represents commands.)
 

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