This sort of thing becomes useful if you want to write a program where the results might go either to the printer or the screen, like so… When BASIC is running, it has three streams normally open. Stream #1 is connected to the keyboard device (K), and is used by INPUT and INKEY$. best fixed asset management software in 2021 Stream #2 is connected to the screen (S), and is used by PRINT and LIST. Stream #3 is connected to the printer (P), and is used by LPRINT and LLIST. All of these commands can be redirected to use another device by including a ‘#’ followed by a current stream number, so…
Loading from tape
- Look through them, and do any that interest you or that seem to cover ground that you don’t understand properly.
- SCREEN$ is the reverse function to PRINT AT, and will (within limits) ‘read’ the character which is located at a particular position on the screen.
- ROM 0 is the ‘editor’ ROM and is the one entered when the +3 is first switched on.
- If your TV does have push-button channel selectors, then press one of them to select a spare channel (ie. one not normally used for receiving TV or video programmes).
- The example above is called the C major scale because it’s the set of notes between two C’s.
The above representation of the coordinate plane is one of the most basic forms, where each tick mark on the axis represents 1 unit. It is worth noting that the axes can be labeled in any number of ways, as long as each axis maintains a consistent interval. For example, instead of the x-axis counting up by 1, the first tick mark to the right of 0 could be labeled 2, the subsequent one 4, and the next 6.
Part 31The BASIC
The (red and cyan) lead-in should produce a clear, steady high pitched note, while the (blue and yellow) information part gives a much harsher screech. This will save the program onto tape using the filename SQUARES. When saving files on tape, you are allowed up to ten characters in the name. https://www.quick-bookkeeping.net/prepaid-property-taxes-deduction/ Unlike disk, you can use any characters you like and the name can include spaces. Mosaic graphics (see the following diagram) can then be produced by pressing the number keys (except 9 and 0). Pressing the letter keys (except T, U, V, W, X, Y and Z) produce user-defined graphics (if set up).
Chapter 4 How to load tape software
Everything the computer does in BASIC will follow these rules. Don’t worry about line 20 spilling over onto the next line of the screen – the computer will take care of this and align the text so https://www.quick-bookkeeping.net/ that it is easier to read. Secondly, there’s a black bar towards the bottom of the screen. This is called the footer bar, and tells you which part of the +3’s built-in software you’re using.
Error reports
Entry 0 must be preloaded with the first filename.type required. Entry 1 will contain the first matching filename greater than the preloaded entry (if any). Note that +3DOS format disks (which are the same as single-sided, single track AMSTRAD PCW range format disks) may have a maximum of 64 directory difference between overapplied and underapplied overhead chron com entries. If creating a file that will subsequently be LOADed within BASIC, then these bytes should be filled with the relevant values. Files without headers have their EOF position recorded as the byte at the start of the smallest 128 byte record position greater than all written record positions.
This is the complete Spectrum character set, with codes in decimal and hex. If one imagines the codes as being Z80 machine code instructions, then the right hand columns give the corresponding assembly language mnemonics. As you may be aware certain Z80 instructions are ‘compounds’ starting with CBh or EDh, these are shown in the two right hand columns. Where a character changes between 48K and +3 (128K) modes, the 48K version is given in brackets after the +3 one.
From now on, we will show keywords to be typed in upper case letters; however, you may continue to type in lower case letters. As we have already discussed – because these lines began with numbers, they were not obeyed immediately but were stored away as program lines. Type in the following first two lines of a program (which will eventually print the sum of two numbers).
