Vlodek_d
New Member
Good day !
First, I'm showing off a little: I finally assembled Kh8088, which had been working for a long time, into a case. For some reason, I love 19" cases)))
In the photo: Xi8088 by skiselev, CGA Redux by hkzlab, OPL2 and FDC by skiselev, VCF XT-IDE Rev 2 and ISA Backplane by Alexandru Groza.
However, there were not enough free slots to add a network card and and EMS card. I will have to do a little more metalwork to move the COM2 and CF card to a separate panel and free up two slots. But that is an optional option.
But there were several shortcomings that I (perhaps) did not pay attention to earlier, or they did not appear earlier.
1) During a "cold" start, the Xi8088 "hangs" at POST 08h for 20 to 40 seconds. Then it boots normally and during "hot" restarts this problem does not occur. I already found information about this problem in other discussions. There, as a reason, they indicated the need to use 82c59 of specific manufacturers, namely AMD. Unfortunately, I only have a Toshiba 82c59 at the moment. I have already ordered several sets of different 82c59, even including the ex-USSR KR1810ВН59А - so I will experiment. But maybe someone has already found other ways to solve this problem.
2) Periodically (quite often), 1.2 MB and 1.44 MB disk drives do not work well. That is, they work - write, read, copy from one to another. But when trying to format the diskette, the most various errors are issued. It is sometimes possible to make a system diskette by chance in one case out of ten. And then after that it is not always possible to boot from it. This is definitely not a disk drive problem or a controller problem - everything works fine on any other motherboard. Alexandru Groza wrote about the same problem with his 386SBMC project - and yes, I also faced the same problem with his 386SBMC. Alexandru Groza believes that the matter lies in the timings on the DMA. I have Xi8088 almost completely assembled on K1533 (74ALS), and maybe it is worth trying to replace Page Registers and X-Bus Transceivers with 74F? - simply, apart from the incorrect operation of disk drives, no other problems arise...
First, I'm showing off a little: I finally assembled Kh8088, which had been working for a long time, into a case. For some reason, I love 19" cases)))
In the photo: Xi8088 by skiselev, CGA Redux by hkzlab, OPL2 and FDC by skiselev, VCF XT-IDE Rev 2 and ISA Backplane by Alexandru Groza.
However, there were not enough free slots to add a network card and and EMS card. I will have to do a little more metalwork to move the COM2 and CF card to a separate panel and free up two slots. But that is an optional option.
But there were several shortcomings that I (perhaps) did not pay attention to earlier, or they did not appear earlier.
1) During a "cold" start, the Xi8088 "hangs" at POST 08h for 20 to 40 seconds. Then it boots normally and during "hot" restarts this problem does not occur. I already found information about this problem in other discussions. There, as a reason, they indicated the need to use 82c59 of specific manufacturers, namely AMD. Unfortunately, I only have a Toshiba 82c59 at the moment. I have already ordered several sets of different 82c59, even including the ex-USSR KR1810ВН59А - so I will experiment. But maybe someone has already found other ways to solve this problem.
2) Periodically (quite often), 1.2 MB and 1.44 MB disk drives do not work well. That is, they work - write, read, copy from one to another. But when trying to format the diskette, the most various errors are issued. It is sometimes possible to make a system diskette by chance in one case out of ten. And then after that it is not always possible to boot from it. This is definitely not a disk drive problem or a controller problem - everything works fine on any other motherboard. Alexandru Groza wrote about the same problem with his 386SBMC project - and yes, I also faced the same problem with his 386SBMC. Alexandru Groza believes that the matter lies in the timings on the DMA. I have Xi8088 almost completely assembled on K1533 (74ALS), and maybe it is worth trying to replace Page Registers and X-Bus Transceivers with 74F? - simply, apart from the incorrect operation of disk drives, no other problems arise...
