Enclosed is the new layout to be added to the logic tests.
The test was performed on the K155RE3 (256-bit, 32x8bit words PROM, open-collector outputs, analogue SN74188N) chip from IC/Microchip USSR (now Russia).
This IC is a PROM (Programmable Read Only Memory), so general testing only makes sense for a blank/clean, non-programmed chip. Because after programming, each chip can have different contents.
In the unprogrammed state, a low voltage is generated at all outputs of the 74188 microchip (74S188). |
