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Very interesting... an authentic conversion of the Taito Invaders in QBASIC ! 
Friday, December 14, 2018, 03:00 PM
Posted by Administrator
It is crazy what can be done with QBASIC (for DOS).
Even the "original" Taito Invaders game, having a *real authentic* look, can be implemented in QBASIC. While looking for GWBASIC samples, I found also some QBASIC samples.
This one was the best one I ever found. It runs with any VGA (screen mode 13).
It was the result of a competition in mid-1996 for retro arcade games written in any version of BASIC. You can download it from the referenced page (related link at the bottom).

It can be easily played by using

Left - Left CTRL
Right - Left ALT
Fire - Right SHIFT
Stop program - Esc

A screenshot of the running game (unmodified):

Meanwhile I have slightly modified the program so a highscore is temporarily saved also, because then it's possible to compare your skill with others (if played on the same computer). The modified version includes also the QBASIC source, just download it from >here<. It looks of course similar:

Take also a look at the other programs James Eibisch published on the referenced "related link" page.

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A rare ECB System: Elzet/P (Elzet-80 series) - Z80 portable in industrial case 
Sunday, November 25, 2018, 12:00 AM
Posted by Administrator
Today I want to show you a meanwhile really rare ECB Z80 system from 1982. It has a ECB-backplane, so many ECB-cards (like the important Z80 CPU Card, the RAM and the FDC-card, and last but not least also a VIDEO-80 (terminal) card) can take place.
The systems exists also in a desktop case, but this one has a "portable" case from Schroff.
Portable means, it has a handle to carry it, but it's unexpected heavy (~20 Kg).
The Z80 CPU runs with 4 MHz, and it has at least 64KB RAM (you can add more) and two quad density floppy drives with 800KB storage capacity.
Usually it runs with CP/M 2.2, which is not extraordinary for an ECB system.

I got the system with a broken power suppy and I had not enough space and also not enough time to repair and run it, so I swapped it against two Microprofessor MPF-1(B) with someone which has space and time enough (I can ask him if you like to exchange infos/expirience etc).
To get an expression how expensive it was, see the offer also from mid 1982:

If you look (=google) for further infos about this system, you will not find so much helpful.
If you're looking for a system disk, I can send you a TELEDISK image file.

Related link points to the wikipedia entry for ECB.
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Elektor SC/MP system, now the real pictures 
Saturday, November 10, 2018, 09:10 PM
Posted by Administrator
CPU (SC/MP 8A/500D aka INS 8050)

I/O board

keypad (self made, not the original pcb)

The related link points to the Elektor site with the related article overview.

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Elektor ("Elektuur") SC/MP - the real device and the emulator 
Thursday, November 8, 2018, 12:00 PM
Posted by Administrator
Somebody told me his father had experimented with the SC/MP processor many years ago, so I pleased him to look after this again. He found the "archived" boards, and now he handed over this to me. This is great, because the CPU is already about 43 years old, and very rare.
I will try to make photos from it, and also to run it again.
Unfortunately the first thing I have to figure out is what happened with the power supply, which looks a bit exotic and perhaps the capacitors are already died, too.

While looking for documents about the SC/MP, I found some hints about a website, which offered also an emulator. Unfortunately the author of the website, Sipke de Wal, already died in 2004.
So I tried to find it on and yes, I found something about it here:
But the emulator can't be downloaded anymore (written in Visual BASIC 6.0), so if anybody knows where to find "", plz inform me.

Sipke wrote about the availability of the emulator in 2001, see also

Picture of the emulator:

The dutch Elektuur magazine from 1977 can be found here:

The archived english versions can be found here:
Look for the issues 11-1977 to 03-1978 for the SC/MP system itself,
later issues covering cassette interface and other extensions

A really nice photo can be found here:

Some other sites also referring to SC/MP related informations, see related link.

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Raped IBM PC/XT on Youtube, ignorance for details at it's best 
Saturday, October 13, 2018, 12:00 PM
Posted by Administrator
Some people might have cool ideas, also to modify originals for a new functionality.
If someone try to modify an original IBM PC/XT to implement a new PC in it, it might be still worth to mention it, especially if the conversion to a modern PC is subtle (not intrusive).
So if someone do this but let the PC still look like the original, and make it possible to use the original floppy disk drives (but with the modern hardware inside), it would be even cooler.

The opposite is ugly. If you destroy half of the original case (e.g. the backside) and if you just use the floppy drive bezel, but remove the rest of the drive(s), it sounds like a brutal modification, without any style.
And even more worse, they use the floppy drive bezels, but mount them reverse (upside down), see the picture taken from the Youtube video:

But judge yourself about the (not well done) conversion, see "related link".

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