Are there any interesting articles or books that explore some of the lesser used BASIC commands/functions e.g. DEF FN, IN, OUT etc?

The Spectrum BASIC manual only glosses over them without going into a lot of detail.

Necros.

... links a bit.
Fixed - DEF FN lines were getting their last ... compatibility meant that REM and DEF FN behaved incorrectly.
Fixed - REM ...

... links a bit.
Fixed - DEF FN lines were getting their last ... compatibility meant that REM and DEF FN behaved incorrectly.
Fixed - REM ...

A while ago Phil demonstrated a nice example of recursiveness in a DEF FN function. Sadly it doesn't appear to be online anymore and I have difficulties finding it out myself: does anyone have a good example? Thx.

... GO TO 20
60 DEF FN M$(IE)=""+M$(IE)+""" is ... evil"
70 PRINT FN M$(IE)
REM etc ...

I have a function: DEF FN t(t$,m,t)=USR ... , for an example: LET bc=FN t("t$()",mcworkspace,mcputt)
DEF FN t(t$,m,t)=m ...

... br /> [code]
4 DEF FN p(a)=PEEK a+256 ... br /> DEF FN g(v)=v-FN h(v)*256:
DEF FN h( ... 5):
LET newVARS=FN p(23627)+machine_code_length+1:
" POKE 23627,FN g(";newVARS;")"'
" POKE ...

... following:

[CODE]100 DEF FN a(x,y,p$)=CODE ... TO y)
110 PRINT FN a(3,4,"Paddy")[/CODE ...

... br /> 10 DIM s$(6912): DEF FN p(a)=PEEK a+256 ... 1):
DEF FN l(v)=v-256*FN h(v): DEF FN h(v ... )=INT (v/256):
LET udg=FN ... 14,0,FN l(df),FN h(df),FN l(dl),FN h( ... searches the DEFADD area (where FN variables are defined) before ...

... also a method using DEF FN (see [post=561279]this ... they both work, the DEF FN wasn't totally satisfying, ... shortage of them) :); the DEF FN definition is shown below. ( ...
[code]
1 DEF FN b$(n,a,b,l ... br /> 2 DEF FN l(v)=v-FN h(v)*256: DEF FN h(v ...

... as 'b']
. eg. FN f("z$()","b",find) -or ... - FN f("z()","",find)
* ... with value 'b'
. eg. FN f("z$()","wxyz",fill) -or ... 'b' (may overlap)
. eg. FN c(22528,22529,127,CHR ... p1[,p2...,pn],r1" or "DEF FN f(p1[,p2...,pn])=USR ...

... it to work?

DEF FN j$(s,l)=CHR$ PEEK ... (s)+VAL$ "FN j$(s+1,l-1 ...

... that uses a$=b$ via DEF FN. I thought it was written ...

... be taken off again.
* DEF FN m(s$)=USR mc: LET ... bc=FN m(s$): whereby mc can ... string details from within the DEF FN statement using the DEFADD pointer ...

... it quick it expects the DEF FN r() to be at the ... DEF FN r(g,s,l)=g:
DEF FN c()=FN p(23621): DEF FN p ... (a)=PEEK a+256*PEEK (a+1):
DEF FN g ... (v)=v-FN h(v)*256: DEF FN h(v ...

... to assign them in a DEF FN statement. Space for these ... be automatically created within the DEF FN statement itself by the BASIC ... and used independently of any DEF FN statement, which allows quick ... be done as a recursive DEF FN.

Finally, knowing ...

... like:

[code]
DEF FN P$(Y)=CHR$ 0+CHR ... , and:

[code]
DEF FN P$(Y)=CHR$ 19+CHR ...

... within a function defined by DEF FN)?

... . For example, in:
[code]DEF FN j$(s,l)=CHR$ PEEK ... (s)+VAL$ (("FN j$("+STR$ (s+1)+","+STR ... {A8} thus:
[code]DEF FN j$(s,l)=CHR$ PEEK ( ...

... />
[code]
10 DEF FN p(a)=PEEK a+256 ... 1):
DEF FN l(v)=v-256*FN h(v): DEF FN h(v ... )=INT (v/256)
20 DEF FN ... q(a$,b$,l)=33: RESTORE 20: LET fnq=FN ... b$,l)
42 REM FN q() PARAMETERS
a$= ...

... "IZX icons"CODE
20 DEF FN z(r,c,i)=USR ... this:

[CODE]FLASH FN z(5, 8, 16)[/CODE ...

... $(row,col) where FN c$() is defined as DEF FN c$(r,c ...

... of commands in the range DEF FN (206) to COPY (255) which ... additional indent (currently set for: DEF FN, LPRINT, DATA, REM, FOR, INPUT ...

So, is there any reason why this user defined function works in SpecBAS but not BASin?

[code]
10 DEF FN m$(a$,n1,n2)=a$(n1 TO n2)
20 LET a$="TheManInTheMoon"
50 PRINT FN m$(a$,12,15)
60 STOP
[/code]

...
* Fixed a bug in DEF FN recursive functions (thanks to Miguel ... .
* ZXC3 version excludes the DEF FN fix, and moves the cursor ...

... /> 9999 LET t1=FN t(): LET t2=FN t(): LET t0=t1 ...

... Applesoft Basic program that used DEF FN (A command I'm not ... for yourselves:-

10 DEF FN M(N) = ((A / N) - INT ... LET O$ = ""
40 IF FN M(3) = 0 THEN O ... $ = "FIZZ"
50 IF FN M(5) = 0 THEN O ...