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How are you testing that new bit of code youve just written?

Hi Guys,

for me one of the most frustrating things in the early days was waiting for UVEPROM's to erase so i could write the new or modified piece of code onto it to be tested in a system. when bug testing this can be fairly time consuming unless you have a substantial number of UVEPROM to keep circulating through the UV Eraser. i know some people write a new piece of code back into memory via a monitor and RS232, some people write and compile to a COM files for use with CP/M etc. i bring up this topic because for me i dont really use monitor programs and really just write a piece of code todo something specific. so after my last system "melt down" i chose to stry solve this issue for the future, which lead me to develop a bit of a frankenstein board that uses flash memory, cpld's, 7400 series, SRAM & a UVEPROM with a "bios" to load whatever "new piece of code" into a specific memory range on startup, whatever that code my be, a buggy monitor, a new routine, cp/m, application specific routine, load machine code for a bus master to take over etc..  im just curius to know what are other people are using these days to save development time and frustration?