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Re: GUS Frustrations

Posted on 2021-03-31, 17:21

Apparently enough people projected their inexperience to bankrupt the company. How easy was it to figure things out without internet, back when everyone didn't have a PhD in Retro? No need to figure out anything - it was all described in the manual. Also, the history of Gravis sound cards was …

Re: Newly made ISA CL-GD5434

Posted on 2021-03-07, 16:01

Would it be safe to conclude that machines that are too old to support the ISA memory hole BIOS feature are probably also too old to have anywhere near 16MB of RAM installed anyway, so it wouldn't be an issue either way? I'm afraid not. The "memory hole at 15M" option is common in PCI machines, …

Re: ET4000AX variants

Posted on 2021-03-06, 13:15

Does the "plain" ET4000 even exist, or are all of them ET4000AX? I don't know about plain ET4000, but there were ET4000C - https://www.vogons.org/viewtopic.php?p=917253#p917253 It's from 9002 - which probably predates all AX chips, one of the earliest being from 9009 - https://www.vogons.org/ …

Re: ET4000AX variants

Posted on 2021-03-06, 08:44

the ramdac was originally a look up table to convert 256 palette colours into R/G/B values. once you leave 8bpp your leaving half the function of the chip behind. In other words, RAMDAC in modes greater than 8-bpp doesn't use the RAM section, only the DAC. Not necessarily. In 15/16bpp modes, you …

Re: ET4000AX variants

Posted on 2021-03-06, 08:33

Can't find the datasheet for ATT20C490 (can anybody help?), but I guess it latches 24 bits from 3 cycles. ATT20C490: https://datasheetspdf.com/pdf-file/530532/AgereSystems/ATT20C490/1 Thanks... so it indeed does latch 24 bits from 3 cycles. With such a RAMDAC, it might be possible to add TrueColor …

Re: DOS drivers, .sys vs executable

Posted on 2021-02-28, 17:21

in DOS
There's actually a PC-98 DOS program called ADDDEV that allows you to load .SYS drivers at any time. It also bundled a program called DELDEV to unload them at any time. Not sure if something similar exists for IBM PCs. There's the DYNALOAD in PC DOS 7.0/2000, but I experienced some issues with it. …

Re: DOS drivers, .sys vs executable

Posted on 2021-02-28, 13:13

in DOS
Oetker wrote on 2021-02-28, 08:02: every mouse driver I've seen was a .com file Search for "mouse701.zip" - contains both .COM and .SYS files. SYS drivers occupy slightly less RAM, because there's no Program Segment Prefix. But COM/EXE drivers can be loaded at any time, and occupy no RAM until …

Re: A new mTCP is available! (version 2020-01-01)

Posted on 2021-02-18, 14:01

in Milliways
Measurements without debugging: download to RAMdrive: 113 KB/s upload from RAMdrive: 650 KB/s With debugging - see the attachment. Also, I wanted to see how much can a 386 score in an environment that's saner than ODI+ODIPKT, so I've installed Linux... Red Hat Linux 5.2 Kernel 2.0.36 time wget -O / …

Re: A new mTCP is available! (version 2020-01-01)

Posted on 2021-02-17, 13:57

in Milliways
To see if the new flow control code is the problem can you rerun the trace but use the 2015 code? See the attachment. Also, I've tried with the FTPSRV. Again, transferring a 10 MB file in BINARY mode. The modern Linux box is now the client. Jul 5 2015 PUT to RAMdrive: 561 KB/s GET from RAMdrive: …

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