diff options
| -rw-r--r-- | release/texts/alpha/HARDWARE.TXT | 60 |
1 files changed, 51 insertions, 9 deletions
diff --git a/release/texts/alpha/HARDWARE.TXT b/release/texts/alpha/HARDWARE.TXT index d952f86..e557135 100644 --- a/release/texts/alpha/HARDWARE.TXT +++ b/release/texts/alpha/HARDWARE.TXT @@ -222,6 +222,10 @@ The kernel configuration file for a NoName kernel must contain: Note: Multia can be either Intel or Alpha CPU based. We assume Alpha based ones here for obvious reasons. +Multia is a small desktop box intended as a sort of personal workstation. +They come in a considerable number of variations, check closely what you +get. + Features: - 21066 Alpha CPU at 166 MHz or 21066A CPU at 233MHz - memory bus: 64 bits @@ -245,11 +249,12 @@ Expansion: Multia has only one 32 bit PCI slot for expansion, and it is only suitable for a small form factor PCI card too. In sacrificing the PCI slot space you can mount a 3.5" hard disk drive. Mounting stuff may have come -with your Multia. +with your Multia. There are also models that do have the riser card, but +lack the actual PCI connector. CPU: The CPU might or might not be socketed, check before considering CPU upgrade -hacks. +hacks. The low end Multia has a soldered-in CPU. Graphics: It comes with a TGA based graphics on-board. Which is not suitable for @@ -266,7 +271,10 @@ SCSI: In case you want to change the internal hard drive: the internal flat cable running from the PCI riser board to the 2.5" (!!) hard drive has a finer pitch than the standard SCSI flat cables. Otherwise it would not fit on the 2.5" -drives. I recommend against trying to cram replacement hard disk inside. Use the +drives. There are also riser cards that have a standard-pitch SCSI cable +attached to it, which will fit an ordinary SCSI disk. + +I recommend against trying to cram a replacement hard disk inside. Use the external SCSI connector and put your disk in an external enclosure. Multias run hot enough as-is. In most cases you will have the external high density 50pin SCSI connector but some Multia models came without disk and may lack @@ -311,7 +319,7 @@ Features: - MiataGL has a 21143 chip) the bulkhead can be 10/100 UTP, or 10 UTP/BNC. - 2x on-board [E]IDE based on: - - MX5: CMD 646 + - MX5: CMD646 - MiataGL: Cypress 82C693 - 1x Ultra-Wide SCSI Qlogic 1040 [MiataGL only] - expansion: 2 64-bit PCI slots @@ -370,10 +378,9 @@ bug. The SRM does not know about the ECO and will complain about unknown cards just like before. The same applies to the FreeBSD kernel by the way. EIDE: -The Miata SRM can boot from IDE CDROM drives. It is also known to work for -MiataGL with hard disks, so you can root FreeBSD from an IDE disk. DMA is -not currently working so speed is not optimal. Boot-ability of EIDE on MX5 is -currently unknown. +The Miata SRM can boot from IDE CDROM drives. Harddisk boot is known to work for +both MiataGL and MX5 disks, so you can root FreeBSD from an IDE disk. Speeds +on MX5 are around 14 Mb/sec assuming a suitable drive. PCI-PCI bridge: The MiataGL has a faster PCI-PCI bridge chip on the PCI riser card than @@ -471,6 +478,11 @@ DEC3000/300 has 5Mbytes/sec SCSI on-board. This bus is used for both internal and external devices. DEC3000/500 has 2 SCSI buses. One is for internal devices only, the other one is for external devices only. +Expansion: +The 3000/300 series has a half-speed TurboChannel compared to the other +3000 machines. Some TC expansion cards have troubles with the half-speed +bus. Caveat empor. + ISDN interface: does not work on FreeBSD (to be honest I don't think there is any operating system, including Tru64 Unix, that can use it). @@ -483,6 +495,33 @@ bits/pins of the SIMM must correspond to what the machine expects. If they don't, the SIMM is 'seen' as a 8 Mbyte SIMM. 8 Mbyte and 32 Mbyte SIMMs can be mixed, as long as the pairs themselves are identical. +When you find yourself in need of fixing 32Mbyte SIMMs that lack correct +presence bits the following info might be of use: + +There are four presence detection bits on PS/2 simms. Two of +the bits indicate the access time. The other two indicate the memory size. + +At one end of the simm there are two rows of four solder pads. One +row is connected to Vss (GND) and the other is connected to pins +67 (PRD1), 68 (PRD2), 69 (PRD3), 70 (PRD4). + +If you bridge a pair of pads with a small resistor or a drop of +solder you ground that particular bit. + +PRD1 PRD2 mem. size +--------------------------------------------- +GND GND 4 or 64 Mbyte +Open GND 2 or 32 Mbyte +GND Open 1 or 16 Mbyte +Open Open 8 Mbyte + +PRD3 PRD4 access time +------------------------------------------------- +GND GND 50 or 100 nsec +Open GND 80 nsec +GND Open 70 nsec +Open Open 60 nsec + DEC3000/500-class can use 2, 4, 8, 16 and 32Mbyte 100pin SIMMs. Note that the maximum memory size varies from system to system, desktop machines have sacrificed box size for less memory SIMM sockets. @@ -629,7 +668,9 @@ Whether FreeBSD/alpha runs on this board is unknown. Please let me know if it does. Power: -EB164 needs a power supply that supplies 3.3 Volts. +EB164 needs a power supply that supplies 3.3 Volts. PC164 does not implement +the PS_ON signal that ATX power supplies need to switch on. A simple switch +pulling this signal to ground fixes this. For the EB164 class machines the kernel config file must contain: options DEC_EB164 @@ -1075,3 +1116,4 @@ People who kindly helped me with creating this document: - Chuck Robey <chuckr@picnic.mat.net> - Mike Smith <msmith@FreeBSD.ORG> - Peter Jeremy <peter.jeremy@alcatel.com.au> +- Dolf de Waal <l.j.de.waal@kader.hobby.nl> |
