Wednesday, 18-Dec-2024 10:52:59 GMT



Z88 Help & FAQ

4 - Odd Bin

Finding Z88's Version Number
There are three UK version numbers. To find out which one you are using you have to do the following:-		Put the Z88 in Index. Press the HELP key Press the Left Arrow key You should now see which version number you are running.
Magic Numbers
The Z88 uses an 8-bit microprocessor. What does this mean to you? Not a lot? What should it mean to you? Like a mileometer in a car that only has say eight numbers, the maximum number you can show on it is 99999999. Add one to that number and you will see 00000000. Although that can give you a low mileage car, it also gives you the wrong result.		There are two ways you can use this `limited number'. The first way is like the car mileometer example where you can count POSITIVE numbers from 00000000 to 99999999. The second way gives you half the numbers you had before but can use both POSITIVE and NEGATIVE numbers. Numbers read the same but can mean different things. Here are a few THREE DIGIT examples to show you what I mean.
Mileometer No   Positive No  Pos and Negative  998  998  -002  999  999  -001  000  000  000  001  001  001  002  002  002
Changing to Binary Having only some numbers give limitations. Unlike the THREE digit mileometer which can give us numbers up to 999, the Z88 uses binary numbers.		The maximum number of an eight bit number is 256 or 127 if it uses the positive/negative number. See Page Length Limitations in PipeDream's bugs.
OZ Gobbles Memory - Slowly
When you start an application, OZ - the Z88's operating system allocates some memory for that application to run in. In an ideal world what you would like to see is it returned to the pool of spare memory when the application has finished with it. This is what is supposed to happen when you (<>KILL) the application. What does our friend OZ do? He sometimes keeps a bit of it for himself and looses it.		What he has lost is what the technocrats call `handles.' This is one reason that you may find memory disappearing, it is not because your RAM pack has sprung a leak. OZ has lost his handles. You can get this memory back by periodically saving all your files - (see Back-up) doing a Hard Reset and loading all your files back again. Alternatively you could try a Soft Reset or remove an EPROM / ROM card which has been reported to sort out handles.
PipeDream
Mixing up Plain Text files with PipeDream format If you Load a file into PipeDream that is not the correct format you will see your file loaded incorrectly. It is easy to fix once you know what is wrong.		The most common mistake that is made is to load a `Plain Text' file into PipeDream without loading it as a `Plain Text' file. You will see the file only in Column A, twelve characters wide. If this happens, load the file again, but use the `Load as Plain Text' option set to `Yes' this time.
Saving a BBC BASIC program to a text file
Load the program into BBC BASIC. Then type []+S    This starts writing a CLI file. Then type LIST This lists the program whilst writing the CLI file.		When listing stops, stop writing the CLI file  by typing []-S The output has been written in :RAM.-/S.sgn This text file can either be loaded into PipeDream or downloaded to desktop computer.
More Static Electricity
Static electricity is all around us. It does irreparable damage to low current electronic circuits, such as those used in the Z88. It can be also responsible for the Z88 doing a Soft Reset when you are inserting the Mains Adapter lead. Inserting Mains Adapter lead Before plugging in the lead, do the following:- With your right forefinger, touch the metallic Serial Port socket. With your left hand get hold of the Mains Adapter lead and touch the metal plug. If you are still alive, plug the Mains Adapter lead into the Z88.
Sharing Same Power Source - WARNING
It might be tempting to run your Z88 and printer from the same power source. Using a car or motor boat battery source for example. There are many DC convertors that can convert from 12v to about 6.8v so in theory, save on battery costs. There is a major problem with this and that is that the positive pin of the power socket on the Z88 is connected internally to the 0v or Ground pin of the RS-232 connector. If you connect two items that are sharing the same power source you short out the power supply.		This does not happen when you are using separate mains adapters for each item because each power source is isolated from the other. You could run one of them from this supply but not both. At worse you will damage both the Z88 and the printer so DO NOT SHARE POWER SUPPLIES.

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	Help Section Contents Help Introduction 1 - Z88 Not Working 2 - Fault Finding 3 - Good Housekeeping 4 - Odd Bin 5 - Bugs 6 - FAST-TRACK 7 - File Conversion 8 - Mailmerge 9 - Printing

	Odd Bin Contents Finding Z88's Version Number Magic Numbers OZ Gobbles Memory - Slowly PipeDream More Static Electricity Sharing Same Power Source

	Z88 Internet Links Z88 Wiki Z88 Forever Z88 RAM Applications Z88 Development Group OpenSCAD Z88 3D Printer Card Details Project: Z88 Development: Summary Z88 Developers' Notes V4.3 Retroisle Keith Korner Colin Parsons (RIP) Z88 Page (Archived) Computer Classic Games Server including Z88 files (Archived) [GONE] Matthew Soar Home Page FWDcomputing on the Z88 and QL [GONE] Dominic Morris Z88 Projects Dennis Gröning - Cambridge Z88 BBCBASIC.org Use Graphics on your Z88 with the BBC BASIC Patch Rakewell Limited is not responsible for the content of these internet sites.

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