8-Bit Software Online Conversion

DefChar 2.05 ============ DefChar is a simple character definition program. You can manipulate the character definitions in various ways. On the display, you see the character set at the top. On the left is the editing grid with the value of each line down the side. In the middle is a menu of operations performed on the whole set, and on the right, operations performed on the editing grid. The options in the menu are selected by pressing either the upper case letter (middle menu) or the indicated letter or character (right menu). The cursor keys move the cursor around the editing grid. Holding Shift down will scroll the grid. Pressing TAB or COPY flips the current bit. Pressing 0 or 1 will reset or set the bit. You can save the character set in two ways. Straight data, or as an Archimedes BBC font file. The former just saves the eight bytes of each definition one after the other. Saving as a Arch BBC font file puts the whole VDU sequences. You can load either type of file. If you load a straight data file, you are asked for the character to start loading at. If the file would extend past character 255, the loading stops after loading character 255. The saved character set can be loaded with *CLoad and *CSave, either as transient commands or in the CharRom. Archimedes BBC font files can also be loaded by *EXECing them (or *TYPEing or *PRINTing them). You can press Return instead of P to Enter a definition into the character set. The check character set option goes through the whole character set to see if any have been duplicated. You can also press * to do *-commands. You can also use a mouse to control the program. The Archimedes mouse and the AMX mouse are recognised. The *Mouse command provides an AMX mouse driver so you can use a mouse without an AMX rom plugged in. On the editing grid, the left mouse button sets bits, the middle button flips bits, and the right button clears bits. Clicking at the edge of the grid scrolls the grid in that direction. Clicking the left button on a character in the character set at the top of the screen Gets that character onto the grid. Clicking with the right button Puts the grid definition into the character set. Clicking the left button over the menus selects that menu option. To define the whole character set, it needs to be exploded. On the Master computer and with a second processor the character set is permanently exploded. On the Electron, B and B+ the character set is by default imploded. *FX20,6 explodes the character set, or the *Explode command. *Explode is provided in the CharRom and as a transient command. The transient command re-enters the current language after exploding the character set to take into account the change in the value of PAGE. You can put the *Explode command in a *EXEC sequence or on a function key if you want to automatically do something after, eg: 10 *KEY 0 CH."Prog2" 20 *FX138,0,128 30 *EXPLODE ON The *FX138,0,128 enters function key 0 into the keyboard buffer. The syntax of the *EXPLODE transient command is: *EXPLODE just explodes the character set with *FX20,6, and re-enters the current language. *EXPLODE ON explodes the character set and re-enters the language, but, on a BBC with no second processor, also puts some code on the Break intercept vector, so that the character set is re-exploded when Break is pressed. *EXPLODE OFF implodes the character set with *FX20,0, and disables any Break intercept code. History of DefChar and DefIcon ============================== Version 2.05, May 1993 ---------------------- DefChar loads font file if enough memory, instead of using BGET. This significantly speeds up network operation. Version 1.00 already did this for saving. Version 2.04, January 1993 -------------------------- Selects shadow screen mode to give more memory. Version 2.03, October 1992 --------------------------- Added ability to use mouse to scroll editing grid. Version 2.02, July 1992 ----------------------- Added a *POINTER 1 command so that Archimedes uses it's own pointer - it looks much nicer than the little cross-hairs. In fact, this was the only modification I had to make to DefChar and DefIcon to have them fully working on the Archimedes. Version 2.00, September 1991 ---------------------------- Major re-write implementing all the functions in the Spectrum and Amstrad versions. DefIcon re-written as a pure modification of DefChar. Version 1.??, 1987 ------------------ Initial version of DefIcon written, to edit Jet Set Willy sprites. This version of DefIcon actually had more features than the contemporary DefChar. However, the author then went to University and lost access to BBCs for quite some time, and so a lot of work got delayed. Version 1.00, 1985 ------------------ Initial version of DefChar, written to define the character sets in the CharRom. Only very simple editing allowed. In fact, some of the character sets were initially defined using the Spectrum and Amstrad versions. Pre-version 1.00 ---------------- Spectrum version of DefChar was a successful 'O' level Computer Studies project. Three versions exist. One purely menu-based, one command based, and one command-based modified to manipulate MEGAbasic character sets. Notes Amstrad version of DefChar written by Greg Heslington Spectrum version of DefChar written by J.G.Harston