Hot answers tagged

29 votes
Accepted

What are these weird long ISA slots on this 386 board? (not VLB)

I found this page on the motherboard, which says they are some sort of "32-bit external memory card." What are these slots? They are exactly that, memory expansion. This is a rather early ...
Raffzahn's user avatar
  • 219k
17 votes

How to use ISA card in modern PC

There's basically two possibilities you may find: The ISA card is a fairly trivial piece of hardware, using I/O ports or memory-mapping only. In this case, it is pretty likely an USB-to-ISA or PCI-to-...
tofro's user avatar
  • 34.1k
14 votes

IDE SSD pulling down data bus

If you are talking about a 44-pin 2,5" IDE to 40-pin 3,5" IDE adapter, that adapter is purely passive and can't be buggy. You are perfectly correct to expect that an conforming IDE device ...
Michael Karcher's user avatar
14 votes

What was the "32-bit" ISA bus (connector) extension for 80386 PCs?

No, this sound card is definitely not intended for such a slot that expands the ISA slot to 32 bits. This is a Compaq-specific sound card meant for a Compaq-specific ISA slot extension. There is no ...
Justme's user avatar
  • 30.4k
11 votes
Accepted

On an ISA bus, is data read on the falling or rising edge of /IORD?

The answer is, on neither edge really, as the data is read some time before /IORD rises. The /IORD is an active low signal for any peripheral to start or stop driving the bus. It is not a latch signal ...
Justme's user avatar
  • 30.4k
11 votes
Accepted

How to build an ATA controller for the AT bus?

A proper ISA IDE interface is quite simple, but not as easy as it might sound. There are some strange corner cases you should consider for full AT compatibility. You can find schematics for ISA IDE ...
Michael Karcher's user avatar
11 votes
Accepted

What was the "32-bit" ISA bus (connector) extension for 80386 PCs?

Were those slots manufacturer-specific or was there some kind of (unofficial) standard? Manufacturer specific. (Well, there was EISA, but I guess it's safe to assume that this question is explicitly ...
Raffzahn's user avatar
  • 219k
10 votes
Accepted

AT system without −5 V

If it works and the voltages are within tolerance then it should be OK to use it. The only thing that might affect things is that normal ATX supplies may regulate voltages according to 3.3 V output, ...
Justme's user avatar
  • 30.4k
10 votes

What are these weird long ISA slots on this 386 board? (not VLB)

Photos of the manual of (nearly) that board appeared on the VOGONs forum in https://www.vogons.org/viewtopic.php?p=844188#p844188 . They clearly spell out that these slots are 32-bit memory slots ...
Michael Karcher's user avatar
8 votes

How do I terminate an ISA bus correctly?

Pull-ups are required (for the lines that are used) but the series resistors are optional. You may wish to place 0Ω links (on /IORC et al.) between the processor's bus and the ISA bus; if you ...
Alex Hajnal's user avatar
  • 9,340
7 votes

IDE SSD pulling down data bus

The interfaces between really old IDE host interface and much more modern ATA can be difficult in terms of compatibility. The 286 may have an IDE interface from the era before even ATA-1 standard ...
Justme's user avatar
  • 30.4k
7 votes

How to use ISA card in modern PC

As mentioned is a comment above by @scruss, some manufacturers (such as ARS Technologies) have created a USB device that provides an USB-ISA bridge and an ISA slot. It is an expensive option, as it's ...
Kaz's user avatar
  • 8,056
7 votes
Accepted

How do I terminate an ISA bus correctly?

The classic ISA bus has very little need for bus termination. For example the first IBM PCs, such as the PC, XT and AT for example did not use any bus termination, and their ISA bus worked fine. So, ...
Justme's user avatar
  • 30.4k
6 votes

What was the "32-bit" ISA bus (connector) extension for 80386 PCs?

The 32-bit extension to ISA was Extended ISA but it doesn’t add any additional connectors, instead adding extra pins to the part of the existing edge connector that is reserved for insulation.
Tommy's user avatar
  • 36.6k
5 votes

Using a Roland LAPC-I without a PC

According to the video description, the creator of the video connected only to the +5V, -5V and ground lines of an ATX power supply If you are, as you write, "unlearned in electronics", I'...
Michael Graf's user avatar
  • 9,900
5 votes

IDE SSD pulling down data bus

I thought a drive's IDE interface is supposed to stay in high-Z unless one of the chip selects are asserted? Anyone know what's going on here? This is correct, even the latest parallel ATA standard ...
jpa's user avatar
  • 1,696
4 votes

On an ISA bus, is data read on the falling or rising edge of /IORD?

Each signal read on an edge needs specific setup and hold time, especially when driving a bus. Therefore, enabling the bus driver with LOW on /OE is correct. It takes some time until all output ...
the busybee's user avatar
  • 1,054
4 votes

On an ISA bus, is data read on the falling or rising edge of /IORD?

You've disregarded the propagation delays of the circuitry. For reads... The CPU/DMAC is under full control of the transfer, inc. when read data is latched and what /IORD is driven to. At the end of ...
TonyM's user avatar
  • 3,658
3 votes

Using a Roland LAPC-I without a PC

Michael Graf already pointed out the basic way to get it working, so here a few additional information bits about the LAPC-I that may help to understand the setup involved: Name It's mostly known ...
Raffzahn's user avatar
  • 219k
3 votes

How to build an ATA controller for the AT bus?

How to build an ATA controller for the AT bus? You can't, as there isn't any. You want to connect IDE-Drives, right? IDE stands for Integrated Device Electronics. Which simply means that the full ...
Raffzahn's user avatar
  • 219k
3 votes

How to use ISA card in modern PC

The Rasteri has come up with a way to connect an ISA card (at least, an ISA sound card) to systems with a TPM connector, up to Broadwell-era or AM4 systems; see his dISAppointment video for details. ...
Stephen Kitt's user avatar
3 votes

How to use ISA card in modern PC

Our custom ISA test cards are working in a more modern PC. The system uses a PICMG 1.0 single board computer with a Intel gen. 4 I5 processor and a PICMG 1.0 backplane Full-size PICMG 1.0 with LGA1150 ...
Josh's user avatar
  • 39
2 votes

Connecting SCM Swapbox PCMCIA reader (ISA) to modern PC

I think this swapbox could be connected to a more modern machine, but it'd require some soldering work to achieve. From looking at the connectors on the cable and card reader, it appears to use a ...
Kaz's user avatar
  • 8,056
2 votes

How to use ISA card in modern PC

I found 2 boards for socket 1150/1151: cost about 270$ us: http://aicsys.com/Industrial-Motherboards-MBC-6605.html cost about 140$ us: https://ipc.msi.com/product_detail/Industrial-Motherboard/ATX/...
Hellraiser's user avatar
2 votes

On an ISA bus, is data read on the falling or rising edge of /IORD?

The data on the ISA bus is read at any time (not specified) at which the target is ready, before the host terminates the cycle. There is some default delay starting at the point of time in which /IORD ...
Michael Karcher's user avatar
1 vote
Accepted

10 pin --> 26 pin VGA controller pinout and Card compatibility with American Megatrends Super Voyager VLB-III

Page 54 of the motherboard manual gives the pinout of its custom 10-pin connector as follows: Pin Signal Pin Signal 1 N/C 2 N/C 3 N/C ...
Kaz's user avatar
  • 8,056

Only top scored, non community-wiki answers of a minimum length are eligible