UP1500

From Alpha Linux Wiki

The UP1500 is a motherboard built by Samsung and released in 2001.

Contents 1 Hardware 1.1 Limitations 2 Hardware Hacking 3 External Links 4 References

Hardware

• 800 MHz EV68AL with 2/4/8MB external L2 cache^[1] (8.5 GB/s^[2])
• AMD-761 Chipset, ALi M1535D+ south bridge
• 4x 184-pin DIMMs, supports 128MB to 4GB of ECC Registered PC2100 RAM (2.13 GB/s^[3])
• 1x AGP 4x (See limitations below)
• 3x 33 MHz 32-bit PCI slots
• DECchip 21143 Ethernet
• ALi M5451 Sound

A list of compatible hardware (SCSI controllers, graphics cards, RAM, etc.) can be found on the UP1500 Compatibility page.

Limitations

• The AGP slot accepts only 3.3V signalling cards, effectively limiting the selection of video cards to those supporting AGP 2x^[4]
• Not all AGP cards that fit the slot actually work, see AGP Video Card Compatibility.
• The IDE controller does not support 48-bit LBA, so hard drive sizes are limited to 128 GiB (137GB)
• IO space needed for PCI counts against the amount of memory usable by the AMD-761^[5]
• According to Ivan Kokshaysky, the UP1000, UP1100, and UP1500's AGP is limited to PCI transfers:

“

There is quite fundamental conflict between the Alpha architecture and x86 AGP implementation - Alpha is entirely cache coherent by design, while x86 AGP is not (I mean native AGP DMA transactions, not a PCI over AGP). There are no such things as non-cacheable mappings or software support for cache flushing/invalidation on Alpha, so x86 AGP code won't work on Nautilus.

”

Hardware Hacking

The northbridge fan on the UP1500 is mostly decoration. Even at an ambient temperature of 30°C and full system load, the board can be run without it. As it is a rather small fan with a high rpm, doing so lowers the noise created by the board considerably. Naturally, if such a "fanectomy" is performed, a keen eye should be kept on the temperatures, specifically of the northbridge.

External Links

• Latest SRM (5.6-19)^[6]

References

1. ↑ UP1500 User's Manual (PDF). Samsung Electronics (March 13, 2001).
2. ↑ HP-SPx264-1500 Hardware Features. Archived from the original on March 11, 2003.
3. ↑ Samsung Semiconductor: UP1500. Archived from the original on June 6, 2002.
4. ↑ Alex Deucher (27 Nov 2008). Re: Graphics card for UP1500, AGP Compatibility and Signalling Voltages. axp-list mailing list.
5. ↑ Ivan Kokshaysky (Sep 13 2002). [patch 2.5.34] alpha: nautilus update. linux kernel mailing list.
6. ↑ Maurice Hilarius (28 Nov 2008). Re: Latest SRM for UP1500. axp-list mailing list.