This is a utility program for the Amstrad CPC-464. It will give you access to a double height character set similar to that found on the BBC micro. The program provides Basic with two new commands by using the RSX capability of the Amstrad. The two new commands are Top and Bat. Anyone familiar with the BBC will know that to print in double height in Mode 7 two lines must be used, e.g.: 10 PRINTTAB(1,10);CHR$(141),"This is an example"
20 PRINTTAB(1,11);CHR$(141),"This is an example"The second line is printed one line lower than the first and CHR$(141) informs the BBC that double height is required. My version for the Amstrad works in a similar way. Any string that already exists in your Basic program can be printed in double height. The syntax is as follows. |TOP,@a$ (This prints the top line as in line 10 above)
|BOT,@a$ (This prints the bottom line as in line 20)The words Top and Bot must be preceded with the | symbol, this is the shifted @ key. Both words must then be followed directly by a comma and the @ symbol then the string to be printed, a$ is used in the example but in fact any string can be used as long as it exists. Also the top and bottom halves of the double height characters can have different Pen and Paper colours, e.g.: 10 X$ = "QWERTY"
20 LOCATE 1,10:PAPER 1:PEN 2: |TOP,@X$
30 LOCATE 1,11:PAPER 2:PEN 3: |BOT,@X$Any character from 32 to 126 can be printed using this utility and it can be used in any mode. The only restriction is that the string to be printed must not exceed the screen width e.g. 80 characters in Mode 2, 40 in Mode 1 and 20 in Mode 0. To enter the program simply type in listing 1 and run it. The data in line 250 is poked into memory first. This is not in fact part of the finished program but is a small machine code routine that transfers a copy of the original character set to a different part of memory thus saving you having to type in an extra 760 bits of data. Once this is completed the data containing the new character sets — one for the tops and one for the bottoms — and the machine code that supplies the two new commands is poked into memory. If all is well the new commands are logged on and a message is printed using the new facility. To save the resulting code use SAVE "D/H.BIN",B,38200,2371To reload it either type as a direct command or as the first line of your own program SYMBOL AFTER 0:MEMORY &9537:LOAD"!":CALL &9E20Your Computer | ★ AMSTRAD CPC ★ DOWNLOAD ★ |
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CPCrulez[Content Management System] v8.7-desktop
Page créée en 369 millisecondes et consultée 1660 foisL'Amstrad CPC est une machine 8 bits à base d'un Z80 à 4MHz. Le premier de la gamme fut le CPC 464 en 1984, équipé d'un lecteur de cassettes intégré il se plaçait en concurrent du Commodore C64 beaucoup plus compliqué à utiliser et plus cher. Ce fut un réel succès et sorti cette même années le CPC 664 équipé d'un lecteur de disquettes trois pouces intégré. Sa vie fut de courte durée puisqu'en 1985 il fut remplacé par le CPC 6128 qui était plus compact, plus soigné et surtout qui avait 128Ko de RAM au lieu de 64Ko. |
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