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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: …

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

Posted on 2021-02-17, 00:14

in Milliways
Interesting, but I suspect it is related to your packet driver setup. Well, yes, it *is* a special setup - one of those elusive 100 Mbps ISA cards, with no native packet driver, therefore the need for the ODI shim. Nevertheless, it all works fine with the 2015 version. For your specific machine - …

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

Posted on 2021-02-16, 12:17

in Milliways
I've found some performance problem in the FTP client in recent mTCP versions... The client machine: 386DX-40 3C515 using ODI driver + ODIPKT.COM The server is a modern machine running Linux. All tests done transferring a 10 MB file in BINARY mode. All numbers in KBytes/s. Jul 5 2015 download to HDD …

Re: Questions on CoPros

Posted on 2021-02-12, 22:48

in Milliways
Come to think of it... Even with an FPU, floating-point instructions are slower than integer instructions, right? Floating-point is only good when precision is important. And games weren't about precision, games were about speed - so it was all based on simplified, integer-only math.

Re: Questions on CoPros

Posted on 2021-02-12, 11:48

in Milliways
I think that support for FPU also depends on the tools used to create the game. See eg. Scorched Earth - mostly written in Borland C++, which means that FPU support is added automagically if only there are any floating-point variables. On the other hand, there are games written mostly (or …

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