If you are looking to purchase the B58944 for your next repair or project, you can find it at several reputable distributors:
Architecturally, the device provides of memory organized in an 8-bit parallel configuration ( nec b58944 datasheet
Since no official NEC B58944 datasheet is publicly archived, the following parameters are derived from NEC’s standard hybrid regulator family (e.g., µPC7800 series and µPC2930 series). Use these values only as a reference for testing or substitution: If you are looking to purchase the B58944