I've never owned a BBC Micro, but I'm on Twitter and there's a BBC Micro bot that will take BBC BASIC code you tweet at it and show you the results.

Links

Characters

The BBC Micro allows you to create your own 8x8 characters for use in programs, here are a few I've made (except the dog, that comes from the manual), remember to change #charnum# to your desired character number

checkerboard: VDU 23,#charnum#,170,85,170,85,170,85,170,85
inverse checkerboard: VDU 23,#charnum#,85,170,85,170,85,170,85,170
dog: VDU 23,#charnum#,32,98,226,62,62,35,33,33
left triangle: VDU 23,#charnum#,128,192,224,240,248,252,254,255
right triangle: VDU 23,#charnum#,1,3,7,15,31,63,127,255
Fibionacci: VDU 23,#charnum#,1,1,2,3,5,8,13,21
Fibionacci 2: VDU 23,#charnum#,8,13,21,34,55,89,144,233
"broken jpeg": VDU 23,#charnum#,129,126,66,90,90,66,126,129
bowtie: VDU 23,#charnum#,129,195,231,255,255,231,195,129
inverse bowtie: VDU 23,#charnum#,126,60,24,0,0,24,60,126
maltese cross: VDU 23,#charnum#,126,60,153,255,255,153,60,126
spiral/@: VDU 23,#charnum#,255,1,253,133,181,189,129,255

Space Invader 1: VDU 23,#charnum#24,60,126,219,255,36,90,165
Space Invader 2: VDU 23,#charnum#24,60,126,219,255,90,129,66

Heart Outline: VDU 23,#charnum#0,102,153,129,129,66,36,24
Heart Half: VDU 23,#charnum#0,102,249,241,241,114,52,24
Heart Full: VDU 23,#charnum#0,102,255,255,255,126,60,24

Frogger: VDU 23,#charnum#60,153,189,255,60,255,129,102