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Nexgen - the 486 killer - WIP

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Reply 40 of 48, by Warlord

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why not ide to m-sata. I've used those a lot. These things here are beast mode. I think I am the only person on vogons who uses them. When I tested this thing I was able to fully saturate the Ultrabay bus on my T43 think pad. That means T43 uses Ultrabay system that is a sata 150 bridged into ide for the harddrive. I was able to fully saturate this with one of these adapters.

There also is just sata to ide adapters and you can just use a normal SSD.

Anyways those Jmicron I think its what they are using Ics worked fine with a 440bx. I can't say for sure if they will work or a antiquated IDE controller.

Last edited by Stiletto on 2020-03-02, 07:07. Edited 1 time in total.

Reply 41 of 48, by mpe

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Warlord wrote:

why not ide to m-sata.

For performance? Perhaps on newer systems that can support UDMA controllers. But in this config 1994-1995 NexGen VL-Bus this is unlikely to make any difference. A good SD/CF card is already comfortably above bus speeds.

I am curious if there is any persistent storage solution attachable to VL-Bus that can move bits faster than ~8000 kB/s.

The Promise chip (PDC20630) on the EIDE3200Plus card is one of (if not the) fastest VL-Bus chips and is actually running in off-specs mode given by my 43 MHz VLB...

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Reply 42 of 48, by Warlord

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Adaptec total advantage VL is fastest. https://storage.microsemi.com/en-us/support/_ … st_vl/ava-2825/

that maybe true and all but ssds are internally faster than a CF card. You maybe able to max out the bus on just read speed, but write speed and random access speed will still be superior with a ssd over a cf. And cfs typically do not have internal cache which greatly increase random access time

Reply 43 of 48, by mpe

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Warlord wrote:

You mean like in EIDE against the Promise EIDE3200 or in SCSI-2 mode against AHA-2842?

Onsemi mentions:

"Up to 33 MBytes/sec burst on the VL bus" in the ava-2825 specs

and

"Up to 40 MBytes/sec burst on the VL bus" in the aha-2840vl series specs

Warlord wrote:

that maybe true and all but ssds are internally faster than a CF card. You maybe able to max out the bus on just read speed, but write speed and random access speed will still be superior with a ssd over a cf. And cfs typically do not have internal cache which greatly increase random access time

Could be. I think I'll try to test that. SSDs are for sure faster than cards. The question is whether the superior internal performance can make a difference when interfacing through a very slow external interface. It is not just the absolute transfer speed thats slower, latencies, buffers, etc.

It is like not even the world's fastest super car can get you faster to work than your normal car through a morning traffic.

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Reply 44 of 48, by feipoa

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Thank you for checking this. That is quite a bit of difference in benchmark results. I'm interested to see if using the same micro-SD card on both versions changes this at all. I personally use a SanDisk Extreme PRO A2 card. Unfortunately, the smallest size it comes in is 64 GB.

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Reply 45 of 48, by mpe

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Need space for new projects, so it is time to finish this build.

First the NIC. HP J2573 with support for 10mb ethernet as well as 100VG AnyLAN standard (which I would like to use for my home retro LAN).

p4wOebd.jpg

Now the CD-ROM. A nice dual-speed Sanyo SCSI drive with unique front loading design;

svNq5hm.jpg

All cards put in leave me with one free ISA slot. Any idea what to put there?

LGKuZgI.jpg

Finished PC looks like this;

ADlPypq.jpg

I don't like the colour contrast. The floppy drive is much brighter than the rest. Will try to source a less bright one. Also need to design a front badge.

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Reply 46 of 48, by feipoa

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Yeah, the white contrasting the beige bugs me too. I try to find floppy and cd-rom bezels that match. It is a lot more troublesome than matching black cases.

Case badge creation is the funnest part of the build. You could also consider painting the screw heads black so they don't pop out as much on the CPU's fan. I've considered this for my own builds, but haven't done it yet.

2-port ISA ethernet card. That's unique, from my standpoint anyway. I assume you are just going to use one of the ports?

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Reply 47 of 48, by mpe

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feipoa wrote:

2-port ISA ethernet card. That's unique, from my standpoint anyway. I assume you are just going to use one of the ports?

Yes. The first port is 10Base-T, the second port is 100Base-VG. They cannot be used simultaneously it is one or the other (100VG doesn't use Ethernet signalling). I plan to use the former until my 100VG network is functional. 100VG AnyLAN retro network is one of my other projects...

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Reply 48 of 48, by feipoa

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Oh, very niche. Did any routers support AnyLAN?

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