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Re: PC/XT/AT (inside) WIP topic
[Re: Kale]
#112959
03/24/18 02:26 PM
03/24/18 02:26 PM
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Joined: May 2012
Posts: 467
shattered
Senior Member
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Senior Member
Joined: May 2012
Posts: 467
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8088 is for 'intelligence', acceleration of writes is done in hardware -- quoting IBM Systems Journal article:
When the CPU is ready to update the memory, there are several modes that may be used.
During a memory access, the CPU may write to a four-pixel bank in any of the following ways:
(1) to all four pixels;
(2) to only one pixel;
(3) from the first pixel to pixel 'x' (where 'x' = 2, 3, or 4);
(4) from 'x' to 4 (where 'x' = 1, 2, or 3).
Additionally, the writes to memory may be accelerated by writing to a 20-pixel group in any of the following ways:
(1) to all 20 pixels;
(2) to any bank of four pixels;
(3) from the start of a 20-pixel group to the end of any bank of four;
(4) from the start of any bank of four to the end of the 20-pixel group.
Writing to one of addresses in 0x32020--0x3203f range triggers the acceleration on next memory write. Pull request coming soon 
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Re: PC/XT/AT (inside) WIP topic
[Re: Kale]
#113041
04/02/18 10:59 AM
04/02/18 10:59 AM
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Joined: Feb 2012
Posts: 60
Switzerland
Tinu
Member
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Member
Joined: Feb 2012
Posts: 60
Switzerland
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Hello
Please excuse such a beginners question. I went through the manual, the Wiki, this thread, but could not find an answer.
So far I played with specific machines (IBM XT for example). Now I wanted to play with specific software and choose a matching IBM Clone.
Some people apparently use the "ct486", which seems to be a generic PC, unrelated to any other machine (at least -listbrothers or -listclones reveals nothing).
This driver runs fine, and is good for software of the DOS / Windows 3 area. For Windows 95, at least a Pentium or better a Pentium II would be a better match.
As a Pentium machine the "at586" exists, but is listed as "not working". This one is embedded in the "ibm5170" universe.
It appears that the Intel Pentium II and Pentium III are coded, but I can't find a machine that actually uses one of these CPUs.
Finally the question: What machine would be a good choice for the late 90ies (Win 95-98, OS/2 Warp 3 etc.)?
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Re: PC/XT/AT (inside) WIP topic
[Re: Kale]
#113045
04/02/18 07:31 PM
04/02/18 07:31 PM
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Joined: Jun 2013
Posts: 28
Kaede
Member
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Member
Joined: Jun 2013
Posts: 28
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I believe MAME defaults for ct486 are more than enough for running Windows 95. According to W95 official requirements anyway. As you noticed, at586 is not working yet*, so for games that required a Pentium 1 to run decently, MAME won't do. Look for alternatives (PCem, virtualization software, Direct3D wrappers...). *more accurate information below 
Last edited by Kaede; 04/02/18 07:42 PM.
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