ROMS

ROMS

Read Only Memories used in ZX Spectrum machines.

23128

16Kx8 bit MASK programmable ROM chip

1 of this IC make the ROM of the ZX Spectrum 16K/48K.

e.g. NEC UPD23128 or Hitachi HN613128P

Pinout:

NC [ A12 [ A7 [ A6 [ A5 [ A4 [ A3 [ A2 [ A1 [ A0) [ (D1)/D0 [ (D2)/D1 [ (D3)/D2 [ (GND)/VSS [

1 °      28 2        27 3        26 4        25 5        24 6        23 7        22 8        21 9        20 10       19 11       18 12       17 13       16 14       15

] VCC ] OE1/(CS) ] A13 ] A8 ] A9 ] A11 ] OE0/(OD) ] A10 ] CS/(OE) ] D7/(D8) ] D6/(D7) ] D5/(D6) ] D4/(D5) ] D3/(D4)