AMD Am2900
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Am2900 is a family of integrated circuits (ICs) created in 1975 by Advanced Micro Devices (AMD). They were constructed with bipolar devices, in a bit-slice topology, and were designed to be used as modular components each representing a different aspect of a computer control unit (CCU). By using a bit slicing technique, Am2900 family was able to implement a CCU with data, addresses, and instructions to be any multiple of 4-bits by multiplying the number of ICs. One major problem with this modular technique was it required a larger amount of ICs to implement what could be done on a single CPU IC. The Am2901 chip was the arithmetic-logical unit (ALU), and the "core" of the series. It could count using 4 bits and implement binary operations as well as various bit-shifting operations.
Computers made with Am2900-family chips
There are probably many more, but here are some known machines using these parts:
- Data General Nova 4, which obtained 16-bit word width using four Am2901 ALUs in parallel; one of the boards has 15 Am2901 ALUs on it [link].
- The Xerox Dandelion, the machine used in the Xerox Star and Xerox 1108 Lisp machine [link].
- The GEC 4060 and 4090 [link]
- The DEC KS10 PDP-10 model [link]
Members of the Am2900 family
- Am2901 4-bit-slice ALU (1975)
- Am2902 Look-Ahead Carry Generator
- Am2903 4-bit-slice ALU, with hardware multiply
- Am2904 Status and Shift Control Unit
- Am2905 Bus Transceiver
- Am2906 Bus Transceiver with Parity
- Am2907 Bus Transceiver with Parity
- Am2908 Bus Transceiver with Parity
- Am2909 4-bit-slice address sequencer
- Am2910 12-bit address sequencer
- Am2911 4-bit-slice address sequencer
- Am2912 Bus Transceiver
- Am2913 Priority Interrupt Expander
- Am2914 Priority Interrupt Controller
- Am2915 Quad 3-State Bus Transceiver
- Am2916 Quad 3-State Bus Transceiver
- Am2917 Quad 3-State Bus Transceiver
- Am2918 Instruction Register, Quad D Register
- Am2919 Instruction Register, Quad Register
- Am2920 Octal D-Type Flip-Flop
- Am2921 1-to-8 Decoder
- Am2922 8-Input Multiplexer (MUX)
- Am2923 8-Input MUX
- Am2924 3-Line to 8-Line Decoder
- Am2925 System Clock Generator and Driver
- Am2926 Schottky 3-State Quad Bus Driver
- Am2927/Am2928 Quad 3-State Bus Transceiver
- Am2929 Schottky 3-State Quad Bus Driver
- Am2930 Main Memory Program Control
- Am2932 Main Memory Program Control
- Am2940 Direct Memory Addressing (DMA) Generator
- Am2942 Programmable Timer/Counter/DMA Generator
- Am2946/Am2947 Octal 3-State Bidirectional Bus Transceiver
- Am2948/Am2949 Octal 3-State Bidirectional Bus Transceiver
- Am2950/Am2951 8-bit Bidirectional I/O Ports
- Am2954/Am2955 Octal Registers
- Am2956/Am2957 Octal Latches
- Am2958/Am2959 Octal Buffers/Line Drivers/Line Receivers
- Am2960 Cascadable 16-Bit Error Detection and Correction Unit
- Am2961/Am2962 4-Bit Error Correction Multiple Buss Buffers
- Am2964 Dynamic Memory Controller
- Am2965/Am2966 Octal Dynamic Memory Driver, [Image]
- Am29112 Interruptible 8-Bit Microprogram Sequencer
- Am29116 16-Bit Bipolar Microprocessor
- Am29700/701 Non-Inverting Schottky 64-Bit Random Access Memory (RAM)
- Am29702/703 Schottky 64-Bit RAM
- Am29705 16-Word by 4-Bit 2-Port RAM
- Am29720/721 Low-Power Schottky 256-Bit RAM
- Am29750/Am29752 32-Word by 8-Bit Programmable Read-Only Memory (PROM)
- Am29754/Am29755 256-Word by 4-Bit PROM
- Am29770/Am29771 2048-Bit Generic Series Bipolar PROM
- Am29774/Am29775 4096-Bit Generic Series Bipolar PROM
- Am29803 16-Way Branch Unit
- Am29811 Next Address Control Unit
Am29300 Family
The Am29300 Family is a more advanced group of integrated circuits, requiring a smaller amount of chips to create a 32-bit computer.
- Am29323 32-Bit Parallel Multiplier
- Am29325 32-bit Floating point unit
- Am29327 32-bit FPU
- Am29331 16-Bit Microprogram Sequencer
- Am29332 64-bit in, 32-bit out, ALU
- Am29334 Four-Port, Dual-Access Register File (SRAM)
- Am29337 Microprocessor Slice Circuit - 16-Bit Bounds Checker
- Am29338 Microprocessor Slice Circuit - 32-Bit Byte Queue,4 FIFOs
- Am29360 32-Bit Error Detection and Correction Unit
- Am29368 1M-Bit Dynamic Memory Controller (DMC)
See also
External links
- [The Am2900 Family Data Book] Bitsavers' PDF Document Archive (30MB)
- [Introduction to Designing with the Am2900 Family of Microprogramable Bipolar Devices Vol 1] Bitsavers' PDF Document Archive
- [Introduction to Designing with the Am2900 Family of Microprogramable Bipolar Devices Vol 2] Bitsavers' PDF Document Archive
- [Am29C300/29300 Data Book] Bitsavers' PDF document archive
- [CPU-World] photos of 2900 Family ICs
- [Bit-Slice Design: micro-controllers and ALUs. an Introduction to the Am2900 Family]
- [Bit-Sliced Microprocessor of the Am2900 Family]
References
- [de] German Wiki, Am2900 Accessed 12 Nov, 2005.
- http://www.bitsavers.org/pdf/amd/_dataBooks/1979_AMD_2900family.pdf Am2900 Family Data Book Accessed 12 Nov, 2005.
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