Philips P3105

This was the third computer that I got , after the beloved Sinclair Spectrum and a CASIO FX-750 calculator with a BASIC interpreter. It was bought in Summer of 1989 , and it was a big jump , compared with the old spectrum , not only in size, but also in the use of disk and the hard disk
(20 Mbytes).

The CPU was an intel 8088 , that can run at the "normal" (4.x Mz) and "fast" (8.xMz,) speed , and has a program to change the the speed internally , the 3.5 drive (720 Kb) where added the same
year, and it was an "high density" drive, but the floppy controller only support the double density
(720kb).

The monitor was monocrome (orange one), with a mixed CGA/Hercules card and an amazing memory of 768 Kb, (640Kb of normal RAM used by MS-DOS and another 128Kb that only with MS-DOS 5.0 and the special software "Qemm" where possible to use for driver.

The Operating System was old MS-DOS 3.30 ,and also in the following years I upgraded the machine to other Operating Systems up to MS-DOS 6.2 , installed the "stacker driver", (to duplicate the hard disk space), and played a lot with it.

I remember also to play with the minix 1.x operating systems (booting from the 360Kb disk drive) and also booting the MS DOS 1.1 , that don't provide the "subdirectory feature (it was mostly a clone of the CPM operating system, other software that runs in this machine was the microsoft windows (from 1.x to 3.11), the GEM Desktop (digital research clone of MacOS graphical environment) and so on.

Sinclair PC200

This was the last machine produced by Sinclair after the company was bought by Amstrad , and in fact the "sinclair name" is only a commercial brand as it seems that the model is not derived from the work of Sinclair Research, but directly from Amstrad.

This is also the only "PC" clonic from sinclair, and it was intruduced in the late 80's, when the amstrad.

The computer is similar to the Olivetty PC1, and other PC clonic in the sense that has the keyboard and CPU integrated in the same chasis, it has a 8086 compatible micro and a 720Kb 3 1/2 disk drive.



As curiosity the computer has output for a CGA monitor and also a TV monitor, in this other picture you can see the TV , CGA , Serial and parallel connectors, and also the
expansion bay.




After some problems (it's very difficult to find a CGA monitor to test the computer) , I realized that I have some "TV" connectors from other very old computers like the sinclair spectrum so I tested and ....



Keyboard is not working ;-(, it seems that the computer has some keyboard problem, it's a pity as it seems that only 20.000 units of this computer were sold, so it is very difficult to find a working one.