- EPIS used in message line extraction mode
- EPIS used to transmit printer data that prints all the messages.
Both of those modes are buffered.
It works in full screen mode. During scrolling, the buffer often gets overflown with data. EPIS attempts to transmit data out of the buffer but soon it has to abort the transmission because the buffer is overwritten again. These attempts accumulate at the receiver side and some apparently random characters are displayed long with some screens but those screens have been transmitted and all that remains of these screens are those orphan characters. The scattered characters eventually disappear once the final screen is brought over from the EPIS board buffer. The problem is associated with the mode of operation and it cannot be totally eliminated. However it can be significantly reduced by manipulating the buffer in certain way. In the new scheme the characters are first grouped in blocks and in most cases the single character transmissions are avoided. The new scheme should be most effective with a very slow console which is where the noise phenomena is the worst.