National Semiconductor NSC800D / NSC800D-3
Specifications
| General information |
| Type | CPU / Microprocessor |
| Family | National Semiconductor NSC800 |
| CPU part numbers | NSC800D is an OEM/tray microprocessor
NSC800D-3 is an OEM/tray microprocessor |
| Frequency ? | 2.5 MHz |
| Package | 40-pin side-brazed ceramic DIP |
| |
| Architecture / Microarchitecture |
| Manufacturing process | CMOS |
| Data width | 8 bit |
| Physical memory | 64 KB |
| Low power features | Power-save feature |
| On-chip peripherals | - Bus controller
- Clock generator
- 8-bit dynamic RAM refresh circuitry
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| |
| Electrical/Thermal parameters |
| Min/Recommended/Max V core | 2.4V / 5V / 6V |
| Minimum/Maximum operating temperature ? | 0°C - 70°C |
| Minimum/Typical/Maximum power dissipation | 0.025 Watt (Power-save mode) / 0.05 Watt / 0.083 Watt |
NSC-800
A little-known CPU.
Basically a Z80 in 8085 clothing. Has half-interrupts like the 8085, but no RIM/SIM support--and the NMI trap interrupt address was 0066H like the Z80 instead of 0024H as in the 8085. I/O port BBH when used with the register-indirect I/O instructions performs some internal configuration settings.
This chip enjoyed brief popularity as an addition to the Godbout/Compupro 85/88 CPU board. With relatively simple changes, it was possible to get Z80 opcode support on that board.
This is a CMOS chip with low-power "sleep" mode.