Jinxter wrote:

Problem: I don't seem to have a serial port on my IBM 5155? - See picture.
Could anybody tell what ports i have?

That is correct, a serial port was not standard back in the day. You need a separate ISA card for that.
I think the large connector is the external floppy connector on your floppy controller card.
The card with two connectors looks like an MDA card, so the 9-pin connector is monochrome video, and the 25-pin connector is a printer port (yes, this also was not standard, if you only had CGA, you didn't have a printer port).
The other card looks like a CGA card with composite and 9-pin RGBI output.

You can use the printer port to communicate with other PCs though. You could use the Fastlynx software for that (and you'd have to build your own cable, or buy one somewhere, since it's not as common as a nulmodem).

LapLink cable and INTERLNK/SVR also works.

I have now testet 8088MPH on my IBM 5155 with 256 KB RAM

https://www.youtube.com/watch?v=kopMLn0j9EI

Great! Sadly you can't run all parts of 8088 MPH with just 256 KB of ram. But the stuff that runs, seems to work perfectly 😀

I have uploaded a longer video showing the whole demo.
https://www.youtube.com/watch?v=0QiS2o2UaH0

Would there be a point adding a Adlib or SoundBlaster card to the IBM 5155?
The price of an AdLib card on eBay is ridiculous - So that is out of the question. But i guess a Soundblaster with 8Bit bus could be used - since it is Ad Lib compatible?

But why a sound card on an 8088 with CGA composite? How many games with Adlib or even SB sound is there for CGA 8088 games?
I guess the 4,77Mhz games was on the downhill in 1987 when Adlib came around? 1987 was also the year IBM 5170 (286) came. So was IBM PC/XT's with Adlib or SB used in the early of 8bit PC/XT computing?

An Adlib card can be used with many games on the PC/XT, but most will run unplayably slow. While the Adlib card was released in 1987, games did not make use of it until September 1988.

The IBM 5170 was released in 1984, and all IBM PCs, the PC, XT, AT, & XT/286 were discontinued in April of 1987.

Scali wrote:

Great! Sadly you can't run all parts of 8088 MPH with just 256 KB of ram. But the stuff that runs, seems to work perfectly 😀

Thank you for being considerate enough to make it handle low-memory systems gracefully, and still give them part of the experience! 😀

Fortunately it is really easy to upgrade a 5155 or 5160 to 640KB of RAM : http://minuszerodegrees.net/5160/motherboard/ … ard_to_640k.pdf

Jinxter wrote:

Would there be a point adding a Adlib or SoundBlaster card to the IBM 5155? The price of an AdLib card on eBay is ridiculous - S […]
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Would there be a point adding a Adlib or SoundBlaster card to the IBM 5155?
The price of an AdLib card on eBay is ridiculous - So that is out of the question. But i guess a Soundblaster with 8Bit bus could be used - since it is Ad Lib compatible?

But why a sound card on an 8088 with CGA composite? How many games with Adlib or even SB sound is there for CGA 8088 games?
I guess the 4,77Mhz games was on the downhill in 1987 when Adlib came around? 1987 was also the year IBM 5170 (286) came. So was IBM PC/XT's with Adlib or SB used in the early of 8bit PC/XT computing?

I have a SB16 Value CT2770 running on my XT 8088 10mhz clone motherboard. Probably the most useful thing that achieves is running the PC speaker through the sound card, sounds a
lot better than a tinny PC speaker.
I have tested it properly in Lemmings, runs a bit slow even at 10mhz but the sound worked fine. I also have a few 16bit IO cards that serial, parallel, and floppy all works well too. I didn't test the
ide but suspect it wouldn't work. I have a CF card PCB so no need for IDE anyway.

Imperious wrote:

Probably the most useful thing that achieves is running the PC speaker through the sound card, sounds a
lot better than a tinny PC speaker.

Good idea. Are there other ways of making the PC Speaker to sound better? Maybe an external jack with some sorth of electronics that improves the sound?

There is no reason why You couldn't run it through a 3.5mm stereo jack to an amplifier, but You would probably need to reduce the amplitude either by a
resistor network or use a potentiometer in line before the amp. I had to turn the volume down quite low in the sb16 mixer software to even things up
with normal sb16 output.
It doesn't sound half bad for what it is, suits the era of the early eighties. Sure even my Vic-20 and TI99/4a have far better audio, but I still like the early
games through PC speaker, all part of the early PC experience.

Today i got my ISA card with 384kb RAM. Now i have 640kb. This meant i could see the whole 8088MPH demo, and play more games.
Only mod i am waiting for know is a Compact Flash adapter that first at the back brackets. With this i can access the CF without opening the cabinet.
What other mods should i have on an IBM 5155?