Re: Fast Ethernet on ISA
Posted on 2019-11-04, 16:33
I wouldn't expect such difference. Could be a result of TX/RX errors /buffer overruns which then cause retransmissions and avoid growing of TCP window size.
Re: Fast Ethernet on ISA
Posted on 2019-11-04, 14:57
TCP ACK is like 40 bytes per every 1500 bytes of data in the worst case. Furthermore the TCP window size will grow up to 65,535 bytes so there will be very few ACKs unless there are transmission errors. Since you likely use a cross-over cable or a switch there are will be no ethernet collisions. …
Re: Are there motherboards with 133Mhz FSB, ISA slots AND an Intel chipset
Posted on 2019-11-04, 13:25
Depending if you ask for official support from motherboard or chipset maker. While it is true tat Intel never officially supported BX at 133 MHz there were motherboards which semi-officially had the support (Abit BX133-RAID) or at least were designed with 133 MHz FSB in mind. In fact BX133-RAID had …
Re: Fast Ethernet on ISA
Posted on 2019-11-04, 13:08
Makes sense. Impact of FD/HD is negligible given you are mostly transferring data in one way only. Without bus master DMA, it will likely only use native DMA which will likely slow down performance roughly to the levels you see it (upper limit is about 1.6MB/S on systems with 16bit ISA). In fact it …
Re: Bought these (retro) hardware today
Posted on 2019-11-02, 18:33
Of course. Just not sure if 75 MHz / 90 MHz models were ever sold with this heatsinks. Boxed 75/90 BPxxxxxx variants I've seen looked just like normal models.
Re: Bought these (retro) hardware today
Posted on 2019-11-02, 18:27
Completed my set of boxed Pentium chips. Not sure if there are 90 / 75 MHz models with this sort of integrated heatsink. Never seen one. Anyone knows? https://i.imgur.com/mHd7TbF.jpg?2 Plus this 200 MMX overdrive: https://i.imgur.com/kxstp44.jpg?2 All of these are working. They just need compressed …
Re: Bought these (retro) hardware today
Posted on 2019-11-02, 15:55
Good question. Not sure. Some SCSI sound (like CT1770) use some flavour of Adaptec AIC chip which look no different to the one used on some AHA controllers. I wonder if you could use the same trick as you are using - putting Adaptec ROM BIOS into the 3Com boot ROM socket?
Re: Bought these (retro) hardware today
Posted on 2019-11-02, 13:04
This is the reason why I prefer using sd2scsi devices rather than CF2IDE. They can be powered from the bus (scsi termination power) and no need for ugly molex power cables. Great solution though!
Re: Bought these (retro) hardware today
Posted on 2019-11-02, 12:23
Are you using the GUS as IDE controller for CF card? Cool! I thought it is ATAPI only... There's no such thing as an ATAPI interface. Well, technically, there is such a thing as "ATAPI Interface". And in fact the letter I in the ATAPI stands for "Interface". However, lets not play games with words …
Re: Bought these (retro) hardware today
Posted on 2019-11-02, 11:41
rikukos wrote: I know I overpaid by a big margin for this but what the heck..It is such a cool upgrade for my PS/2 Model 30-286. […] Show full quote I know I overpaid by a big margin for this but what the heck..It is such a cool upgrade for my PS/2 Model 30-286. Are you using the GUS as IDE …
Re: Fast Ethernet on ISA
Posted on 2019-11-02, 11:20
Simple DMA is actually slower than PIO. What these cards need is Bus Master DMA. As we know ISA Bus master is a kind of black magic. I'd check if it is enabled. Run the config tool for the card in DOS and make sure it is on and there is DMA channel set. Looking into 3C515.c source code, it looks …
Re: Fast Ethernet on ISA
Posted on 2019-11-01, 16:30
Not sure about the speed. But you can avoid the FTP by using netcat. Something like: On one end: nc -l 8888 > /dev/null on the other side: dd if=/proc/kcore bs=1000 count=1000 | nc 8888 Then you can experiment with block size
Re: 486 SX 16 & 20 MHz
Posted on 2019-10-30, 14:29
While I hear what you say about implementation quirks and practice vs reality: - I don't currently own one, but I've definitely seen a working 386 VL-Bus system (typically late boards that shipped with soldered 386 or SLC/DLC that also had 486 upgrade socket). Visit the 'System Specs" section on …
Re: 486 SX 16 & 20 MHz
Posted on 2019-10-30, 12:08
VL-Bus Specifications It looks like they are encoding missing A1, BLE2#, BHE2# signals into BE0#, BE1# and BE2#.
Re: 486 SX 16 & 20 MHz
Posted on 2019-10-30, 11:45
This is from 2.0 from 1993. I know, what you want to say. But 1.0 spec revision is nowhere to be found and there is a plenty of evidence the 386DX/SX bus support has been always there and is implemented by targets as documented by various VGA controllers datasheets. The 2.0 is basically added …
Re: 486 SX 16 & 20 MHz
Posted on 2019-10-30, 10:58
I'd say there is a difference between 386 and Pentium/Nx586. Pentium/Nx586 surely cannot be interfacing directly. If for nothing else its 64-bit 60/66 MHz electricals would be a problem. The VL-Bus spec states that: Hosts other than 386- or 486-class CPU may require control translation circuity …
Re: 486 SX 16 & 20 MHz
Posted on 2019-10-30, 09:40
Scali wrote: Not really. That was actually a quote from VL Bus specs which goes into details about what the differences between VESA Local bus and 486 Local Bus are 😀
Re: 486 SX 16 & 20 MHz
Posted on 2019-10-30, 09:27
But these were extremely rare and generally quite buggy (seeing as VLB is a direct connection to the 486 bus and technically *is* 486-specific. There were also Pentium boards with VLB but they never worked quite right either, for the exact same reason). Happy Nx586 VL-Bus user here... I think it is …
Re: Bought these (retro) hardware today
Posted on 2019-10-29, 17:00
Well, Fast Ethernet cards for ISA can't achieve 100 Mbps, but still, they are faster than 10 Mbps ones. Also, the irony: there are Fast Ethernet cards for ISA, but probably not a single such card for VLB. Nice example of how short-lived VLB was, isn't it? https://www.vogons.org/download/file.php?id …
Re: Bought these (retro) hardware today
Posted on 2019-10-29, 11:20
HanJammer wrote: Also 100Mbps LAN card supposed to work in the ISA slot is not really ideal idea to start with... True. I wish they made this in VL-Bus 😊
Page 47 of 55