ROMS: Difference between revisions
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==ROMS== | |||
Read Only Memories used in ZX Spectrum machines. | 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 | |||
Pinout: | |||
<div style="font-family:'Lucida Console', monospace"> | |||
{| | |||
| style="text-align:right;" | | |||
NC [<br> | |||
A<sub>12</sub> [<br> | |||
A<sub>7</sub> [<br> | |||
A<sub>6</sub> [<br> | |||
A<sub>5</sub> [<br> | |||
A<sub>4</sub> [<br> | |||
A<sub>3</sub> [<br> | |||
A<sub>2</sub> [<br> | |||
A<sub>1</sub> [<br> | |||
A<sub>0</sub>) [<br> | |||
(D<sub>1</sub>)/D<sub>0</sub> [<br> | |||
(D<sub>2</sub>)/D<sub>1</sub> [<br> | |||
(D<sub>3</sub>)/D<sub>2</sub> [<br> | |||
(GND)/VSS [<br> | |||
| style="border: 1px solid black" | | |||
1 ° 28<br> | |||
2 27<br> | |||
3 26<br> | |||
4 25<br> | |||
5 24<br> | |||
6 23<br> | |||
7 22<br> | |||
8 21<br> | |||
9 20<br> | |||
10 19<br> | |||
11 18<br> | |||
12 17<br> | |||
13 16<br> | |||
14 15<br> | |||
|| | |||
] V<sub>CC</sub><br> | |||
] CS<br> | |||
] A<sub>13</sub><br> | |||
] A<sub>8</sub><br> | |||
] A<sub>9</sub><br> | |||
] A<sub>11</sub><br> | |||
] OE/(OD)<br> | |||
] A<sub>10</sub><br> | |||
] {{overline|OE}}<br> | |||
] D<sub>7</sub>/(D<sub>8</sub>)<br> | |||
] D<sub>6</sub>/(D<sub>7</sub><br> | |||
] D<sub>5</sub>/(D<sub>6</sub><br> | |||
] D<sub>4</sub>/(D<sub>5</sub><br> | |||
] D<sub>3</sub>/(D<sub>4</sub><br> | |||
|} | |||
</div> | |||
[[Category:Hardware]] | [[Category:Hardware]] | ||
[[Category:Integrated Circuit]] | [[Category:Integrated Circuit]] | ||
Revision as of 16:30, 7 May 2021
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
Pinout:
|
NC [ |
1 ° 28 |
] VCC |