Hi everyone!
I have an old Portable PC that I put a 2MB memory card in, along with an EGA
card, sound card, and some other stuff. I'm doing my best to max it out.
Anyway, I'm having some trouble with hard disks. I have two hard disk
controllers: a Seagate ST02 SCSI/Floppy controller, and a Juko Labs D16-X
IDE controller. Now both of these cards work okay, except they recognize
some strange sizes for the disks. The only disk that seems to show up
correctly is a Quantum LP105S...the others I tried, all bigger than a gig,
are either not recognized, or recognized with the wrong size. This is also
the case with the IDE controller - everything is recognized at 10MB. I
purchased an LBA PRO card for my machine hoping to overcome the large disk
size problem, but all it does is freeze the machine...however, if I remove
the 8088 and replace it with a NEC V20, I get the banner for the hard disk
drive card, and THEN the machine freezes.
So my questions are:
1. Does anyone know a good solution for putting a large drive in an XT,
while still leaving it an XT?
2. Should I leave the V20 in? I've heard it has compatibility issues with
some programs, but I'm not solid on my information.
Regards,
Julian
This particlar can't handle this large due to decoding issues or
capacity issues (1GB is too large for 8088 than needed), either the
XT is a shoddy clone the TTL timings is not right if using a firmware
add on to handle large IDE capacities.
Hang on a second, this is an XT. In fact I assume 'Portable PC' means the
IBM 5155, which has a real IBM XT motherboard in there.
The motherboard BIOS on an XT does not support hard disks at all. The
hard disk drivers are in an extension ROM, conventionally placed on the
hard disk controller card. So if a particualr card won't support large
drives, it's an issue with the firmware on that card, not with the
motherboard BIOS.
The SCSI is best for this if stuck with 8088.
Otherwise keep under
500MB with IDE, not even 540, have to be under 500. Is the portable
standard XT or baby AT layout? Go with 286 or 386DX then everything
else will work as described. There are many 286 and 386 boards that
has XT mounting holes layouts. Choose carefully, there are so many
junk out there.
The problem with this is that the keyboard interface changed between the
XT and AT. And you pretty much have to stick with the original XT
keyboard on a 5155...
-tony