I bought one of these exact boards from China a few months ago. They are a little pricey at around $25-30. Also recently I bought a 486DX and motherboard on Ebay. I am hoping that this card, via the USB stick, will give me an easy way to transfer DOS programs downloaded on my main PC to the 486. I …

Just FYI, on my own minimum 8088 PCB I use the RDY inputs of the 8284 clock generator to implement single stepping. When RDY is held low, the CPU stalls in what appears to be the T3 state (I find the waveforms in the 8088 datasheet quite unclear), and the RD and WR strobes are active (low). Raising …

@kdr thank you. I followed the link and found the following (which I was previously unaware of)... "From left to right the columns are: CPU address/data, CPU flags, bus address, bus data, DMA requests and acks, interrupt requests, bus flags, bus states for CPU and DA accesses, transfers, prefetch …

@mkarcher - thank you. I have always seen AEN used to decode port addresses, but never really understood what it did. @reenige - thak you. The waveforms are interesting, although I'm not clear what each column is tracing. @rasz_pl - thank you. Very interesting links. Seems to confirm that memory to …

So the story is, I have designed and built a 8088 PC compatible PCB, using the standard I/O chip set (8259 ICU, 8253 Timer, 8255 PPI) and I am currently debugging the system. I use SRAM so no need for complicated refresh using DMA. For simplicity I omitted DMA, hoping that I could read the floppy …

why to use a XT-IDE in such a newer computer setup ? I need a way to get files onto the (new) retro computer, such as drivers and software apps (e.g. Doom), from my main computer. I thought that this ISA adapter could be a possible solution. A 1.44M floppy is useful but often limiting. theres …

Quick update. I tried on my other newly purchased Slot 1 motherboard (Award BIOS based) Acorp 6VIA81. It has 3 ISa slots. I plugged in the XT CF-Lite with the unconfigured (apart from the checksum byte) EEPROM, which was programmed using ide_386.bin. I now see the little menu and messages. It scans …

By the way, I am practically a complete newb as far as this is concerned . In other words, I know just enough to be dangerous, but not enough to fully realize what I'm doing . Ha, ha! Me too. Thank you for the pointer. I didn't quite understand the discussion, but I understand that your BIOS needs …

darry wrote on 2021-09-16, 20:27: Did you use XTIDECFG to configure the XTIDE BIOS BIN file before writing it to the EEPROM ? Yes for the original ide_xt.bin, but no not for the ide_386.bin. I did generate the necessary checksum for both versions using my stand-alone programmer.

OK, so I did the "make my own ISA card ROM" experiment. I used the XTIDE source code as a guide. I had already downloaded the source and confirmed that I could compile it using NASM (*). The instructions on the Universal BIOS website were very clear. I had to very very heavily cut down the code. …

I recently bought some old PC hardware with the idea of using it to rescue data from old hard disks, 3 +1/2 and 5+1/4 floppy disks. Due to the surprisingly high cost of 286,386 and 486 motherboards, I decided to buy a slot 1 motherboard since I already have a 333MHz Celeron(*) (which I remember …

PCI CLK connects to ISA CLK via a 75 ohm resistor and connects to the 74F74 clock and also to the CLK LED. PCI FRAME connects directly to ISA OSC and also connects to the FRAME LED. PCI RESET connects directly to ISA RESET and goes into GAL U1. One output of GAL U1 goes to the RESET LED. I get the …

I very recently bought four of these cards via AliExpress. I asked for them to be shipped from the UK (to the UK), to avoid issues with import duties. They arrived after about a week, so I assume that they already had stock in their UK warehouse. The cost was higher than I expected from searches …