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Since my Commodore PC20-III is broken, I wanted to mount its HDD in my Philips P3105 instead. The P3105 has an XT-IDE interface on board, just like the PC20-III. The HDD in question is a WD93028-X. It was formatted in the PC20-III, MS-DOS 5 installed, and it used to boot just fine. But I can't...

For those of you who hadn't heard of Serdaco's OPL2LPT yet: there is a device that is basically an AdLib with a printer-port interface. Now, the PCjr may not have any ISA slots, so there is no chance of ever getting an AdLib installed... but it does have a printerport sidecar, so I thought I'd...

My Commodore PC20-III died the other day. It was powered on, and at some point, it just went dead. I tried to powercycle it, but not much happened. On a few attempts, the power led came on weakly, but then it went away again. I took the PSU apart and checked the fuse, but that was not it, fuse...

Over the years, I've heard various stories on the vertical retrace interrupt on EGA/VGA cards, and how this may or may not be supported, is broken, or whatever... So I want to put this myth to bed and find out what's what. To begin at the beginning... IBM first implemented a vertical retrace...

This is not my auction, but I recently bought some other stuff from this seller, and he notified me of these two batches of software he's put up on Ebay: https://www.ebay.com/itm/272979202584 https://www.ebay.com/itm/272979166315 Perhaps someone here is interested.

Perhaps some of you were aware that this past Easter weekend, the world's biggest demoparty was on: Revision. There was one release for 8088 there, it was a chipmod song using the sound routine that reenigne originally developed for the endtune of 8088 MPH. The rules required that the executable...

My demo group, DESiRE, has just released a megademo on the TI99/4A at the Synchrony demo party. Thought you might like it. You can download the binary here, if you want to run it on real hardware: http://www.pouet.net/prod.php?which=68783

Having toyed with a few clones over the years, I recently heard a recording of a real Covox that Trixter made. The sound quality was excellent, better than any clone I heard. So I'm looking for a real Covox. Clones need not apply.

I am currently playing around with Hercules graphics programming. I don't have a real Hercules card. I do however have two clones. One is an ATi Small Wonder, the other is a Paradise PVC4 (two very similar cards, perhaps even a shared design?). What I noticed is that these cards use a 16.257 MHz...

I have the following code: typedef enum { MACHINE_PCXT, MACHINE_PCAT, MACHINE_PS2 } MachineType; ... MachineType machineType; _asm { mov [machineType], MACHINE_PCXT } Now, for some reason, OpenWatcom complains about an invalid operand for the MACHINE_PCXT value (I ported this code over...

For my retro coding I use either Turbo C++ 3.1 or OpenWatcom 1.9. I wanted to write some common library code, where I use some #ifdefs to handle compiler-specific parts, so the same code can be used for both compilers. I stumbled upon this very useful page, so I thought I'd share it...

I have recently been toying around with the auto-EOI mode of the 8259A, to try and save a few bytes/cycles for time-critical timer interrupt stuff. I got it working on my IBM 5160. But then I got a 286 machine, and well... the plot thickened. Namely, I wanted to reset the PIC back to its...

I just read this news item: http://www.bbc.com/news/technology-34996402 Apparently a group of volunteers is building a replica of the EDSAC, which will be on display at The National Museum of Computing at Bletchley Park once it is finished. I would love to see this when it is finished. See it...

Some time before 8088 MPH, another demo was released by Genesis Project, which claimed to run on 8088+CGA: http://www.pouet.net/prod.php?which=65292. https://youtu.be/t83LHBOM4PE In actuality, it did not. It only worked in DOSBox. I have since righted that wrong, and I have now written a blog...

I have recently bought an Acorn Archimedes A3010, and am just learning about the machine and the OS. Eventually the goal will be to write some graphics/music routines and do a demo or perhaps even a game. The machine intrigues me somewhat because of a few reasons: - It seems to have been quite...

I've been toying with OpenWatcom as a cross-compiler for my old IBM 5160... and I ran into a problem. It seemed that as soon as I pulled in any code that used floats, it would lock up, even before it ever got to the main() of my program. I could not reproduce this problem in PCem, DOSBox or any...

The original IBM 5150 had a cassette interface, as most of you probably know. The PCjr also had one (which was compatible afaik). But on the 5160 it was removed... and we have never seen it again. Playing around with my 5160 the other day, I accidentally got it to boot in ROM BASIC, because the...

I have two machines which are Plantronics ColorPlus-compatible. One is the onboard video on my Commodore PC20-III. The other is a Philips P3105 which came with an ATi Small Wonder. (By the looks of it, the onboard video of the PC20-III is just an ATi Small Wonder copy-pasted onto the...

Here's one you guys might like: http://scalibq.wordpress.com/2014/12/24/test-drives-pixelized-transition-effect/ Basically an analysis of the transition effect used in Test Drive, and various tweaks to make it faster. Just for teh lulz.

For my democoding, I am looking for an original IBM PC. It needs to be a REAL IBM, since it has to be cycle-exact to other IBM machines in every way. This can be a 5150, 5155 or 5160, as long as it meets the following specs: - 512-640K memory installed (I think this pretty much rules out the...