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**450NX (?) 06/29/98:
Chips:
[82454NX] (PXB) [82453NX] (MUX)
[82452NX] (RCG) [82451NX] (MIOC)
[82371EB] (PIIX4E),
CPUs: Single/Dual/Quad P-II Xeon/P-III Xeon
DRAM Types: FPM EDO 2-way Interleave 4-way Interleave
Mem Rows: 8
DRAM Density: 16Mbit 64Mbit
Max Mem: 8GB
ECC/Parity: Both
AGP speed: N/A
Bus Speed: 100
PCI Clock/Bus: 1/3
**????? (Profusion) c:99...
**800 series...
*Headland/G2...
**HT21 386SX/286 Single Chip (20 MHz) c:Aug91
***Info:
The HT21 is an advanced PC/AT compatible, single-chip 80386SX/80286
design solution. This highly integrated single chip allows simple,
low cost system design options while featuring high performance, low
power consumption, and minimum board space requirements. Advanced
memory management features include support for page mode, 2 or 4-way
interleaving in both pipelined and non-pipelined modes. The LIM 4.0
hardware implementation features dual sets of 32 registers with full
context support for highest performance Optimization of extended local
memory accesses. An advanced EMS hardware write-protect option is
provided. The HT21 supports 256K and 1M DRAMs in l by 1, 1 by 4, and 1
by 9 device configurations for up to 8MB of on-board system memory. A
flexible Shadow RAM option for System and Video BIOS as well as 8-
16-bit BIOS Options adds to overall design versatility.
A complete PC/AT compatible system with advanced features may be
implemented with minimal external support logic. The HT21 performs all
CPU and peripheral support functions in a single chip. Integrated
device functions include DMA Controllers, a Memory Mapper, Timers,
Counters, Interrupt Controllers, a Bus Controller and all supporting
circuitry for PC core logic requirements. The chip also contains all
the necessary address buffers, data transceivers, memory drivers,
parity checking and supporting circuitry for a complete high
performance computer solution. An asynchronous AT Bus clock allows for
a constant 8MHz Bus clock rate for highest bus device compatibility as
defined in IEEE Spec P996. In controlled bus applications the HT21
supports up to a 12 MHz Bus Clock rate. This device is packaged in a
208-pin Plastic Quad Flat Pack combining several external buffers into
this space saving solution.
***Configurations:...
***Features:...
**HT22 386SX/286 Single Chip (25 MHz) c:Sep91...
**HT25 3-volt Core Logic for 386SX c:Dec92...
**HT35 Single-Chip Peripheral Controller [partial info] ?...
**HTK320 386DX Chip Set c:Sep91...
**HTK340 "Shasta" 486 Chip Set c:Jun92...
**Support Chips:
**HT44 Secondary Cache c:Jun92...
**Other:...
*HMC (Hulon Microelectronics)...
*Logicstar...
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*OPTi...
*PC CHIPS/Amptron/Atrend/ECS/Elpina/etc...
*SIS...
*Symphony...
*TI (Texas Instruments)...
*UMC...
**Other chips:
***Video:...
***Disk:...
***Peripheral:...
***Other:
UM3750A Programmable 12-bit Encoder/Decoder
UM6502/07/12 8-bit Microprocessor 1,2,3,4 MHz Versions
UM6502E 8-bit Microprocessor 1,2,3,4 MHz Versions
UM8048/35/49/39 Microcontroller
UM8051/31 Microcontroller
UM74HCT590 8 bit Binary Counter with Output Registers
UM74HCT646 Octal Bus Transceiver and Register
UM2332/UM2333/UM2364 Mask ROM
UM2366/A Mask ROM
UM23128/A Mask ROM
UM23256/A Mask ROM
UM2147/UM2148/UM2149 SRAM
UM6104/UM6104-1 SRAM
UM6114/UM6116-2/-3/-4 SRAM
UM6116-5/UM6164 SRAM
UM6167/UM6168 SRAM
UM9001/UM9003AF Network?
UM9007F/UM9008 Network?
UM9009 Network?
UM9017F/UM9018 Ethernet
UM9026 Fast Ethernet
UM9090 Network?
*Unresearched:...
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