Universal Research Labs 1975
url.h10, g10 and d10 are 82s23b
url.l10 a 82s114 read as a 82s115
It complained about continuity error, but I disabled it to read
The 82s115 is a bigger chip and the address lines do not line up

82s115		82s114
A0		A0
A1		A1
A2		A2
A3		A3
A4		A4
A5		N/C
A6		A5
A7		A6
A8		A7

Data should be valid every other 32 bytes

Board powered up and showed a vertical game
What looked liked clouds were throughout the screen
A small jet looking graphic was facing towards the bottom of the screen
4 digits (score) was in the bottom left and a 2 digit count down timer was in the right
Didn't see any moving objects, just the score counting down

The Bronze Age Arcade game archive shows that Avenger by Electra has board number EG-1020
This board has EG-1020-2 etched in copper

URL.BMP is a dump of url.l10, if you remove every other 32 bytes
These look like the clouds