Peter's site blog

The real first IBM PC: The (almost portable) IBM 5100 ! 
Monday, January 21, 2019, 11:11 PM
Posted by Administrator
Most of us can't remember this "PC" (no, not an Intel PC, of course).
But it even has elements (parts) which are similar to the first IBM PC (e.g. the power switch).
In 1973, a prototype for programming APL was build, named SCAMP.
IBM developed it further to the Model 5100 (followed by 5110, 5120).
It already had a 16bit "CPU" (in fact, the CPU is a module with more than one IC), which addressed 64KB RAM, and had also a kind of bank switching for accessing memory (like the later CP/M 3.0 computer).
I am fascinated about it's mass storage (a QIC magnetic tape) and it's professional finish (... what else do you expect from IBM in 1975 ?). Beside APL, it can be programmed in machine language and of course in BASIC (not Microsoft BASIC !).

This is an advertisment which praise the systems versatily and obvious portability (24Kg) ;-)
Interestingly, the first IBM PC got the model number 5150... also not by accident.

Last but not least, a popular japanese anime series and movie and also a well known video game for several game consoles named "Steins;Gate" has also an IBN 5100 (sounds similar, eh) as a guest star. See here:

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Merry XMAS and a happy new year 2019 ! 
Tuesday, December 25, 2018, 02:00 PM
Posted by Administrator
I wish you a merry christmas and a happy new year 2019 !

Btw. There is an Amiga demo existing, which contains digitalized singing ("Leise rieselt der Schnee", means "silenty is falling the snow") and a colorful picture showing a lot of Santa's ... but it's an unusual demo, hard rock inspired a bit, and the gestures are unusual, too ....

There are other Amiga demos which shows 3D effects and more, but not really XMAS related.

Also, I've found an improved version of CPMLS (running on Windows).
Take a look at to get more infos.
Really useful.

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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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