8088 PC XT Compatible On An ISA Card. Second Build. 

I will have to try it. Have you gotten up to a 1.44mb drive to work?

@@elijahmmiller yes, and also 2.88 MB, although that requires an FDC that can do 1 Mbps

The system runs in minimum mode. I have been looking at adding an 82188 bus controller because it can handle both the 8087 and 8237 requests. I think in total it would add 3 chips to the system.

This is a 4 layer board. For the routing what I do is on one side the traces only go right to left and the other up and down. And the middle layers are the same. This keeps them from tangling up.

I have. One day I may try it out.

I have found anything over 10 mhz doesn't work well with the ISA bus. It is just too fast. I think you need to have an external bus controller that keeps the speed of the ISA bus below 8 mhz. Or something that inserts some wait states into the bus cycles. I have had some luck with a prototype running at 16 mhz.

I haven't ever looked into making a Graphics Card. Do you know where some good schematics are?

@@elijahmmiller GitHub, but most CGA VGA cards replicas are complicated. I remember the most simple cards were single W86855AF chip based HGC I thought you might have such a card.

No I have one blank left. I am out of town this week so I paused the eBay listing. I have 4 on my desk mostly built that I am waiting on some ROM chips to finish them out.

It is a generic multi I/O board. I think the brand is Gold Star.

Correct it is all SRAM. One advantage of the lack of the DRAM refresh cycle is there is a noticeable overall speed increase.

Of course! SRAM is what's used for cache even today, on cpu dies. I know YOU know this, but others might not.

No it would interfere with the Pentiums Address and Data bus