Did you get good at F8 asm?

You know, it is possible to make a testrom for finding out the initial SRAM contents to see if there is a specific pattern that can be imitated on MAME. Delta-1 has 4 digits. You could read from RAM and show it on the display(2 digits for address, 2 for data) with half a second delay after each read, do this in a loop 256 times.