Producer: Psion, 16K
£4.95

A very good copy and a classic version with the best graphics of the lot. Nice bright yellow asteroids which shatter satisfyingly. A bit slow, although the shattered fragments change direction and move faster. Alien ships are well defined graphically. Using Z/X for rotation and SPACE/ENTER for fire/thrust is quite good, but H for hyperspace takes some getting to in an emergency. No skill levels, which means the addictivity rating is low, but good value at the price. No joystick option.

Producer: Psion, 16K
£4.95

A very good copy and a classic version with the best graphics of the lot. Nice bright yellow asteroids which shatter satisfyingly. A bit slow, although the shattered fragments change direction and move faster. Alien ships are well defined graphically. Using Z/X for rotation and SPACE/ENTER for fire/thrust is quite good, but H for hyperspace takes some getting to in an emergency. No skill levels, which means the addictivity rating is low, but good value at the price. No joystick option.

Producer: Psion, 16K
£4.95

A very good copy and a classic version with the best graphics of the lot. Nice bright yellow asteroids which shatter satisfyingly. A bit slow, although the shattered fragments change direction and move faster. Alien ships are well defined graphically. Using Z/X for rotation and SPACE/ENTER for fire/thrust is quite good, but H for hyperspace takes some getting to in an emergency. No skill levels, which means the addictivity rating is low, but good value at the price. No joystick option.

INTERFACE GAMES ARE FAST BUT NOT FURIOUS

John Gilbert reviews the ROM cartridge software currently available.

The Sinclair Research Interface Two has had few kind words said about it and that it is not surprising. The add-on is supposed to give the Spectrum the ROM potential of the Atari games consoles and computers into which you can plug ROM cartridges which will load games into the machine directly on power-up. It should have been the ideal add-on for users who want a quick-load device and no messing with tape recorders or even Microdrives.

The main difficulties with the idea are that the software available consists of reproductions of arcade games which are already on the market and that many software companies have been deterred from producing software for the interface because of the conditions attached to ordering.

At the moment companies have to order batches of 1,000 cartridges in a sector of the market which is not fully-established. It is a risky business even for a company as established as Melbourne House or Psion. The situation could develop so that Sinclair is the only company producing the ROM cartridges. It certainly has the monopoly now.

The first ROM packages, together with their colourfully-styled display boxes, to arrive on the market were titles which already existed on the cassette format in the Sinclair software library. They included Planetoids, Backgammon and Space Raiders which are all from Psion.

The packages, one of which appeared originally on the ZX-81, are not particularly innovative or awe-inspiring and they are certainly not the kind of titles which would be expected to be produced when bunching a new peripheral for a prime-selling microcomputer. It is as if Sinclair could not wait to get Interface Two out of the way and so complete its obligations for peripherals for the Spectrum. One reason may well have been that the new QL machine was occupying its thoughts.

Backgammon featured as the only mind game in the first release, the others being held back because the Psion games were the quickest to produce. It is a pity that Backgammon was first instead of the chess package, which was left until later - chess has a far greater appeal to the majority of home computer users. Fortunately there was a gap of only two months before Chess was released and it has proved to be one of the better software packages in the launch.

Space Raiders is a painfully slow version of Space Invaders and could just as well be bought on cassette more cheaply. There are three spaceships with which you can fire at the aliens which amble across the screen.

Once you have finished one screen of the game, and that is not difficult, you will progress to the next level which is just as difficult or easy as the first. That makes the game a push-over and there is little challenge to tax even the newcomer to the arcade game scene.

Like most of the games in the range the price of the program on cassette is only £5 but the ROM version costs almost £10. Considering that the software does not show off either the graphics, colour or sound of the Spectrum to best effect it does not seem advantageous to buy the ROM version.

Planetoids is another arcade game with a familiar theme. Your spaceship first appears stationed at the centre of the screen and asteroids start to close in on it. You must try to destroy them and avoid the ones you miss. Alien spaceships make your task even more impossible.

The standard of the game is reasonable for the market, even though it was first produced in late 1982. The graphics are better than the original Atari version of Asteroids. The ship and the planetoids have been given a solid, almost three dimensional quality.

The program has a wrapround screen which allows your spaceship to go off one side and return on the other. That causes a strange effect when your ship fires across the screen, as the missiles will disappear off one edge and reappear somewhere else. The rogue missiles could even cause you to have some nasty accidents shooting at yourself.

Those packages comprised the ROMs available at the launch of Interface Two and there was a considerable wait until the other ROMs were launched in December.

The new packages include some old favourites from Melbourne House, already in the Sinclair software library, and some releases introduced by Ultimate Play the Game.

The Melbourne house offerings feature the clown of the software scene. The newest Horace adventure is not on ROM but it is pleasant to see Hungry Horace having a re-birth and Horace and the Spiders on ROM.

For those who know nothing of the Horace myth he is a little round, Pacman-type creature who has the habit of annoying everyone he meets.

Each of the games has a cute plot and Hungry Horace sees the round man taking the part of a Pac-man. He is, however, no ordinary powerpill eater. He has to eat the flowers in the park and avoid the keepers who will throw him out if he is discovered. If you go through one maze into another there will be more surprises and if you are adept enough you may start to think that there is no limit to the number of mazes in the game.

Horace and the Spiders is slightly different Horace has to dodge the spiders to gain points before he can reach the main part of the game which takes place in a cobwebbed house. You must destroy the spiders and their webs if you are to win the game.

The Horace adventures are a pleasure to play and it is good to see them in a format where they can be loaded immediately you feel like a quick game.

The range of Ultimate games is also worth having on cartridge, although they could be bought more cheaply on cassette from that company.

In chronological order, Jet Pac was the first game Ultimate produced for the Spectrum. In it you play a spaceman whose task is to deliver and assemble spaceship kits and to collect valuable treasures on the way. You will be faced with all kinds of odd creatures which you must avoid and destroy to complete your task.

The other games from Ultimate are Pssst, which involves a robot keeping away the bugs from a sunflower, and Cookie, which involves a chef bouncing ingredients for a cake, avoiding the nasties in the larder and keeping clear of the bins. Both games are arcade standard in quality and benefit from the ROM treatment.

The only mind game in the second release of ROM software is Chess. It is the original cassette version which has existed since the title was launched, with no changes. That is surprising since Mikro Gen, the original manufacturer of the game, has produced an upgraded version.

The game is standard so far as computer chess goes with options for playing or setting-up the board to play in particular situations. There are 10 levels and the highest, nine, takes several minutes to make a move. Each move for both you and your opponent is monitored in seconds, minutes and hours on a chess clock above the board on the screen.

The future of the ROM interface is still uncertain and many software houses are unsure what they will do in the way of supporting it. It seems unlikely that any large-scale production of programs on Sinclair standard ROMs is planned in the software industry and Sinclair could be in the unenviable position of having a monopoly of ROM software.

Sinclair Research hopes to produce some language and utility packages for Interface Two but the company still has no idea which language or utilities will be available, or when. It is likely that a ROM version of Micro-Prolog will be available soon but no firm date is being given even for that step forward.

The indications are that it will be the last interface for the Spectrum. The buffer at the back of the board will support only a ZX printer and Sinclair has given no intention of producing more peripherals for its home market machine. It would therefore seem logical to support the interfaces it already has as far as it can and to promote the use of those devices as much as possible. As far as Interface Two is concerned it has crept on to the market with more of a whisper than the bang which was expected.

MASTERING THE ROGUE ROCKS

Asteroids became one of the craze games of the early 1980's after the worldwide successes of such mega-games as Space Invaders and Galaxians.

It is considerably more difficult than those earlier games, where you had really only two controls to worry about. Asteroids added hyperspace, thrust, rotate left, rotate right and fire.

The game places you in control of space ship being bombarded by a shower of meteorites that come at you relentlessly from the four corners of the screen.

Using your controls you must spin your ship around to shoot the asteroids.

You can also dodge in front or behind the rocks using the thrust button.

If things get a little too hot and a collision seems certain the hyperspace button will make you momentarily disappear and then replace you at random on the screen. But this could prove as dangerous as blasting away at the oncoming role!

Extra points can be earned by shooting down the mystery flying saucers which spin in and out of the asteroids.

We tested versions of the game so far available for the Sinclair Spectrum.

Meteor Storm was the closest to the arcade version of the three games we tested. The asteroids were represented as geometrical line drawings drifting weightlessly towards your ship.

The game displayed clear instructions on the screen and also showed you the value of the various asteroids and flying saucers on the screen.

All three games kept a running total of the high scores but Quicksilva's Meteor Storm took you a stage further than this enabling you to enter the initials of the top ten high scorers of the session.

This version also provides you with a keyboard overlay which, although it seems just like a gimmick, is actually quite useful in Asteroids-type games where you have up to five controls to concentrate on.

My main criticism of Meteor Storm is that the thrust button has inertia, causing you to drift helplessly towards an asteroid, frantically rotating and thrusting.

Sinclair's official software writers, Psion, entered the field with Planetoids. This is not as close to the arcade game as the Quicksilva version though the graphics are no less impressive for this.

Planetoids had the best fire mechanism of the three games tested. The missiles could be fired in quick succession and reached their targets swiftly.

The final version tested was Meteoroids from the new software writers - Softek.

This was not as good a version of the game as the others played. An admirable attempt had been made to simulate the rock-like texture of the asteroids but this did not work. They looked more like chewed up pieces of bubble gum.

There was really not much to choose between the other two - though for my £5 the Quicksilva version is marginally better because of its extra facilities and graphics.

Memory Required: 16K
Price: £4.95

Space Raiders and Planetoids are Psion's versions of the arcade games Invaders and Asteroids. Anyone who still has an appetite for these games will find the Psion products more than adequate.

SINCLAIR RESEARCH OPENS ITS SPECTRUM SOFTWARE LIBRARY

John Gilbert assesses the new major range of cassettes and finds they do not compare to the machine's qualities.

When the Spectrum was launched, Sinclair stressed that a software library containing business, household and games cassettes would be released soon.

The first batch of tapes was launched at the Personal Computer World Show in September. The launch was billed as one of the great attractions of the show. Spectrum owners were looking forward to putting their machines to good use. Unfortunately, unlike the Spectrum computer, the new tapes are disappointing.

The Spectrum library, with a few exceptions, seems to be a repeat of the ZX-81 range of tapes launched in early 1982. The new software library comprises several sections which include the Fun to Learn series, Pastimes and Games. There are also several cassettes, such as Bio-rhythms and Vu-calc, which stand alone.

There is a set of five games cassettes. Each contains four 16K games which have been written for Sinclair by ICL.

The games are very simple and it is easy to lose interest in them in a very short time. Several of them, such as Martian Knockout, Invasion from Jupiter, and Galactic invasion, are all based on the same principle - guessing the velocity at which you have to fire a laser cannon at a group of marauding aliens.

The game consists of entering the guessed velocity and pressing NEW LINE. That becomes incredibly tedious after the first 10 minutes' play. The rest of the games are either of the Invader, Mastermind or maze types.

Daylight Robbery is not only the phrase which might be used to describe some of the new software but is also on the Games Three Cassette, although it has slightly more depth to it than some of the others. The player moves around a maze full of safes. For every safe which can be cracked the player will have the amount of money in it added to the total score.

The only danger encountered with entering the safes is that the player must dodge the guards in the maze. The game is enjoyable for a short time but it plays rather like Pacman and is much less addictive.

Of the five games tapes in the series so far, Games One seems to be the best value. It contains one of the few games which will last longer than five minutes. Labyrinth is an adventure maze game in which the player must fight monsters to find hidden gold in the maze.

Each of the games cassettes costs £4.95, which is somewhat expensive for what they contain. It would have been better to have sacrificed quantity for quality on this occasion. The illustrations on the insert cards are of good quality but people expect better games for the price.

Two of the cassettes in the library mysteriously are labelled Pastimes but would have been better-placed in the Games series. They include a Mastermind game called Secret Code; a memory game Kim; and a puzzle, Magic Square.

Magic Square is interesting for a time but soon it becomes just another trivial observation game. The computer displays a square filled with rows of letters of the alphabet in a jumbled sequence. One space in the square is empty. Letters can be shifted around using the blank to place the alphabet in the correct sequence.

Kim also displays a square but with numbers in it. The numbers disappear one at a time in a random sequence and the player must guess which letter has disappeared each time. Again, the game is interesting but becomes dull and repetitive after a time.

The games on the two cassettes do not warrant the title of Pastimes as they are too repetitive and because of the lack of depth the player may soon begin to feel disappointed. Pastimes cost £4.95 each.

The Fun to Learn cassettes provide the user with a series of question-and-answer races on various subjects. With only one exception the graphics capabilities and sound facilities of the Spectrum are not used to full advantage. Neither is there a real reward at the end of the tests to induce the user to try again.

The cassette which redeems the whole Fun to Learn series is Geography. The computer displays maps labelled with numbers and the user has to guess which numbers correspond to towns and countries displayed below the map.

The idea behind the cassette is good and the map display is reasonably detailed. The cassettes in the Fun to Learn series are £6.95 each.

The Bio-rhythms cassette from ICL is also very good value. The program will plot bio-rhythms and also calculate the critical days for the intellectual, physical and emotional cycles. The graphics are fairly good but the display is confusing when all the cycles are plotted on one graph.

The best cassettes in the range have been produced by Psion. They include Vu-calc, Space Raiders, Planetoids and Hungry Horace, a new Pacman-type game.

Space Raiders is an addictive space invaders game. The only thing wrong with it is that it is too easy to achieve a high score. Scores of 10,000 have been reached in less than 10 minutes.

Planetoids is an above-average asteroids game which is very difficult to beat for any length of time. The asteroids are displayed in 3D and the players'ship is easy to move around the screen. The game is more difficult to beat, faster, and much more fun than Space Raiders.

Hungry Horace is an ideal game for young children. It uses the Pacman mould but is a great improvement on the popular arcade game. Horace is a large purple blob with arms and legs. He wanders up and down the maze-like park eating everything in his path and avoiding the guards who try to capture him. He can scare away the guards by ringing-the alarm in the maze. If he can reach the exit he enters another sector of the maze and continues to the next exit.

The game is difficult but after a time a degree of skill can be developed in evading the guards. The mazes become more difficult as the game proceeds and we managed to reach only the third section of the maze. Hungry Horace costs £5.95 and is well worth the money.

The cassettes in the new Sinclair range can be split into programs which can be played and enjoyed again and again and those with which the user will easily become bored. There are no really outstanding cassettes in the range so far, although Planetoids, Bio-rhythms, Space Raiders and Hungry Horace can be recommended.

These games have the depth in them to be played for months, while the others may leave the Spectrum owner disappointed. All the cassettes mentioned use 16K memory. Further details about the range can be obtained from Sinclair Research, Camberley, Surrey GI15 3BR.

ARCADES BROUGHT INTO THE HOME

John Gilbert reviews more complex games.

Almost every major type of arcade game has been simulated on Sinclair computers. There are also new games which have an arcade format but have evolved on a microcomputer. The Spectrum is an ideal machine on which to play arcade games. The quality of them has improved substantially since the launch of the machine. Some of the first arcade games to be produced for the Spectrum were versions of Space Invaders, the game which started the arcade craze.

Spectral Invaders was the first to be announced by Bug-Byte, which was already renowned for its arcade and adventure games on the ZX-81. So far it is the game which most closely resembles the original arcade version. Although it is slow it is difficult to score points, as you can fire only one laser blast at a time.

Another invaders game, Space Intruders, was launched at about the same time as Spectral Invaders. The game is much faster and is recommended for those who like to keep their fingers on the fire button and amass a big score. The only criticism is that the aliens and mothercraft are very small and the mothership is blue on a black background and so is very difficult to hit. Apart from that Space Intruders from Quicksilva is good value at £5.95.

Namtir Raiders, for the ZX-81, is a space invaders game with a difference from Artic Computing. The player still has to face the hordes of aliens which come down the screen but the laser base can be moved up and down as well as left and right.

The player has five laser bases during the game and they can take only five hits from alien bombs. There are three levels of difficulty-easy to impossible. The game, costing £3.95, is addictive and the graphics are neither awkward in design nor jerky in movement.

The game which is gaining popularity with 48K Spectrum owners is Time Gate, from Quicksilva. The authors claim that it is the ultimate in 3D arcade space action. The game is loaded in two parts, the first being a lengthy instruction manual. After the manual has finished you can load the game. The object is to destroy a race of aliens called the Squarm who are trying to colonise Earth. The enemy fighters are also seen in 3D and so are the planets on which the player can land to refuel and repair the ship. It is by far the best arcade action game so far for the Spectrum and costs only £6.95.

Asteroids is also becoming popular on Sinclair machines. One of the first companies to launch a version for the ZX-81 was Quicksilva. It was a good version on such a small machine and is still proving popular.

Quicksilva has also introduced a Spectrum version called Meteor Storm. It has the added attraction of speech before play. It is difficult to hear the words but we are informed by the authors that it says "Meteor Alert... Meteor Alert...". Meteor Storm is a novel version of Asteroids and costs £5.95.

Sinclair Research has a good game of asteroids, called Planetoids, in its new Spectrum Software library. The asteroids are in 3D and much careful design work on both the asteroids and the player's ship seems to have gone into the game. Planetoids costs £5.95.

Artic Computing seems to be the only company to have produced a version of Galaxians for the ZX-81. ZX-Galaxians looks like Space Invaders but the invaders are 'V'-shaped and are supposed to be inter-galactic birds. The birds swoop from formation and bomb the player's laser base. ZX-Galaxian is slow in action but can still be a very addictive game. It costs £4.95.

Defender is still a much-sought-after game in the arcades and Artic Computing took advantage of that early by producing a version for the ZX-81. The graphics are not particularly interesting and the spaceship which the player flies across the landscape is made up of a series of blocks which look only slightly like a ship.

Despite those criticisms, the original idea behind the game is still there and the Artic version can be exciting, as you see the enemy ships rushing at you from the other side of the screen.

With the arrival of the Spectrum, many manufacturers found an interest in the arcade game Scramble. The best and fastest version so far is from Mikro-Gen. In the game you have to go through caves which become smaller and smaller as it progresses.

The game becomes progressively more difficult and can be run in slow, normal and fast modes. It costs £3.95.

Silversoft has a Scramble-type game called Ground Attack. It works on the same principles as the Mikro-Gen game but is much slower. There is a good deal of blank screen between game rounds and the average waiting time between rounds is 15 seconds. Ground Attack costs £5.95.

The range of arcade-type games on Sinclair machines is always increasing. Manufacturers seem to feel safe in producing standard arcade games such as Space Invaders and Scramble. Those games, especially for the Spectrum, are becoming more imaginative and the graphics and sound more impressive.

Manufacturers have to be careful about copying ideas from other games but with the imagination of some of the firms in the Sinclair market, children and many adults will be kept happy with arcade-type games on the ZX-81 and Spectrum for a long time.

Space Invaders games have now been overtaken by Pacman in popularity.

Bug-Byte, 98-100 The Albany, Old Hall Street, Liverpool L3 9EP.

Quicksilva, 92 Northam Road, Southampton SO2 0PB.

Artic Computing, 396 James Reckitt Avenue, Hull, North Humberside.

Sinclair Research, Stanhope Road, Camberley, Surrey GU15 3PS.

Mikro-Gen, 24 Agar Crescent, Bracknell, Berkshire RG12 2BK.

Silversoft, 20 Orange Street, London WC2H 7ED.

Official Sinclair writers Psion have entered the battle for Spectrum asteroids with Planetoids.

This game is not quite so close to the arcade original as the Quicksilva version though it is none the less impressive for this.

The game has an excellent fire mechanism - the missiles could be fired in quick succession and reached their targets swiftly. The game had the essential five features - rotate right, rotate left, fire, thrust and hyperspace.

This version also includes the missile-spraying UFOs which really add spice to an Asteroids screen and usually warrant a torrent of abuse after one of their more successful excursions.

One drawback was the lack of inertia on the thrust button. This makes the game slightly easier to play but would upset the purists who want to play arcade Asteroids on their own TV sets.

Despite this one reservation, the game plays pretty good Asteroids and is a more than reasonable piece of software for £5.95.