Quantum Lap , Sinclair QL

In 1984 sinclair launched the QL, Quantum Lap, as a computer aimed to a more professional sector, it has some revolutionary aspects (it was based in the 68008 Processor, a 32 bit processor with a 8 bit interface, ( 8 bit connectors and hardware was cheaper and price was always one of the basic features of Sinclair machines).

The system has a revolutionary "multi tasking BASIC interpreter", 128 Kb of RAM and instead of using the expensive floppy drives (remember 1984 , 5' 1/4 floppy were still common in 1990, or the slow and sequential tape system (like the spectrum ), uses their own technology , the "microdrive"

Microdrives were in fact small tapes that were inserted in the unit and must be formatted to be ready, to use, allowing to store about 85kb of data.

As the tape runs quite fast, the tape must be formatted in sectors , so it can be used as a random
device (instead of the typical sequential tapes).

Here is the a view o the unit, the QL came with two units

As this machine was targeted to the profesional market it come with a full "Office Software", in four
microdrives and other blank microdrives.

The package was "Quill" (the word processor), Abacus (spreadsheet ) , Archive (Data Base) and Easel (Graphs) that provides most of the usual needs for an normal user.

The machine provides two serial interfaces and was able to connect to other QL machines using their own network protocol (similar to token ring), and be connected to a normal TV or a computer monitor, also has serial interfaces ,

Sinclair Spectrum 48k

This was the first computer that I got, in 1984, the current keyboard is newer , as it was purchased as a normal sinclair and late converter to the "plus" one (the only difference was the keyboard).

The machine has a zilog z80 microprocessor and has 16kb of ROM and a RAM memory of 48Ks, including 6912 bytes for the graphics display and other system variables so only about 40,5 kb where employed normally for games and software.

The programs where loaded from a tape (I still have too much tapes full of programs ;-), and it was possible to program in BASIC and machine code, the graphic resolution was not great , but some of the programs are still amazing .

In order to save RAM space the BASIC interpreter assingned one of the ASCII code to each of the language keyworks, so for example the "print" command employs only a a byte of memory. A complicated combinations of keystrokes allow to produce all the symbols, one of the various emulator was named "JPP" , due to the fact the "J" key directly puts the "load" command and the double quotes wre in the "P" key so JPP was roughtly load "" , the order to load any program form the tape.

In this picture you can see the power plug for the external power adaptor , the expansion slot and the tape plugs for connecting the machine to and external tape. Later sinclair models (+2) have the
tape incorporated to the machine.

I'll try to find all the hardware (for example a game save device, parallel port, etc) that I 'd for this machines

The most usual problem with this macine was the keyboard, under the plastic cover in the Spectrum 16k and 48k, there were this plastic membrane that was easily broken when you tried to play games, and the only solution was to replace it.