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question re. STR$ bugCould someone point me to whereabouts in the ROM this goes wrong? [code]PRINT PAPER 5;1;STR$ 234[/code] (Only the "1" prints in cyan.) It's not the m…
This routine (48 bytes) provides a BASIC replacement for STR$ which fixes those two bugs; use "FN s$(numeric_expression)" instead of "STR$ numeric_expression". I copied the ROM's method used in CIRCLE & DRAW for checking -1 -
Help needed... RND in machine codeI have been battling away trying to convert a simple BASIC routine (below) to machine code, but to no avail. The routine is used to fire 2 bullets a…
... b,$1D ;B= calculator code for VAL
rst $28 ;FP_CALC
defb ... next RND value on the calculator stack; the remainder does the ... -
Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
... by not using the FP calculator but I expect that it ... -
RND cyclical behaviourGood evening. I'm playing with RND function to show its cyclical behaviour, i.e. after 65536 calls to it, the next one will return the same value of …
... b,$1D ;B= calculator code for VAL
rst $28 ;FP_CALC
defb ... -
Maths problemHi guys! I'm having a bit of trouble with a small section of code in Basic. I am spinning a wheel around with numbers 0-9 on it (think of the code w…
... with the Spectrum's calculator at RST &28.
Calculator literal &32 ... top two items on the calculator stack where m is the ... -
Basic BASIC help needed RNDHi all, I have recently re-discovered an old program I wrote in the early 90s which would do generate random lottery numbers. I know little now, an…
... br /> RNDFUN: di
rst $28 ;FP_CALC
defb $A0 ... 1D ;B= calculator code for 'VAL'
rst $28 ;FP_CALC
ld b,$09 ;B= calculator code for 'x -
Custom Menus on the ZX Spectrum +3Today, my Friends, i have the pleasure of presenting a program i have written which gives a set of custom menus on the +3. The main features of my p…
... to use the Floating Point Calculator, such as [url="https ... entry points into the calculator that call the relevant ... entry into the calculator is via the [b]RST $28[/b] call followed ... by a number of data bytes representing calculator ... -
Macros and PasmoHi guys. I'm starting out with Pasmo for writing some stuff for the +3, and i'd like to use Macros for the calls to the BASIC ROM, where' you'd othe…
... write something like:
[code]RST $28
DEFW RoutineAddress[/code]
MACRO CBAS RoutineAddress
RST $28
DEFW RoutineAddress
ENDM ... -
New SPIN 0.3a releaseHi all, here's the next version - mainly a maintenance release, with new bugs :) Here's what's new: V0.3a - Bugs and more tapes -------------------…
... />
original
--------
EF RST #28
EF15 DEFW #15EF
D7 RST #10
patched
URGENT programming question !I've gotta draw a line from machine code using the standard routine at 24B7, which expects the delta-X and delta-Y values on the BASIC stack. I put t…
Hey, mystery solved !!! I know how to do it - I push X1 and X2 on the stack, call RST #28 to subtract them, push Y1 and Y2 on the stack, call RST #28 to subtract, and call the DRAW routine.]
Can't believe it was so easy. :)Competition: Sadistick routine on Spectrum ROMMy vote goes to BEEPER at #03B5 Let's ear you pick! :) And a great BOHHHHHHHHHHHHH to Dr Ian Logan & Dr Frank O'Hara for their description about the…
[quote]
On 2005-05-02 17:23, AE.Vasconcelos wrote:
Nope... Floating point in assembler is too much for me to handle.
[/quote]
Hint: RST 28Homing missile routine - help neededI am attempting to write a routine which will allow a missile to home in on a player. Basically the sort of thing you see in most shoot-em-up games. …
... could use the FP Calc (RST 28) in the Rom, but this ...Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
... two more bugs :
28 ) Enter debugger. Go right down ... it thinks $0000 contains the RST 28 ($EF) opcode.
29 ...Spin problems/issuesI am running Spin 0.666 and have noticed a few issues (some are bugs, some might be just me). I am using Vista sp1 (yeah I know!), and I've seen Dunn…
[QUOTE=Jimmy;278083]28 ) Enter debugger. Go right down ... it thinks $0000 contains the RST 28 ($EF) opcode.[/quote]
Haven ...+3 BASIC and RST 8I've been working on adding commands to the BASIC interpreter, in a similar style to how Interface 1 does it (catch the RST 8 error trap). This works…
logical operators and the calculator stackI was wondering if there was a utility which would provide the list of commands needed for the ROM calculator to evaluate a logical expression. For e…
... faster than the built-in RST #28 forth-like interpreter.Recent talk of developing new SpectrumsHi all, I can see from a few threads on here that some Wossers like Vasil and Aien 8 are interested in developing more powerful Spectrums or improvi…
... an FPGA, because when the RST 28H instruction is read, instead ... the Z80 from fetching the RST 28. (There's some more detail ...Need in beta-taster`s helpHello to all. I have developed hard-soft emulator of ZX Spectrum 48, but there are problems in work. My topics is: [url]http://www.worldofspectrum.or…
IN or INKEY ?just curious which is better to use.. I have a menu done.. and use 6/7 to go up down it + space to cycle thru the options (using inkey).. obv. if I w…
... the intervening operator. So perhaps RST $20 is used to scan ... stack the logical operator, call RST $28 and then call FP_TO_BC to ...IN or INKEY ?just curious which is better to use.. I have a menu done.. and use 6/7 to go up down it + space to cycle thru the options (using inkey).. obv. if I w…
... stack the logical operator, call RST $28 and then call FP_TO_BC to ...Calculating percentage..or even calculating percentage. Maths and asm I find verryyy tricky. Can anyone suggest the easiest/best way to calculate a percentage from two 1…
... value
call STACK_BC
rst #28
db #05 ;/
db ...M/C mathsHow would I do the equivalent of LET A=B*7 in machine code?
...
CALL $2d28 ;STACK_A
RST $28 ;FP_CALC
DEFB $04,$38 ...number padding functionI wrote a number padding function in BASIC a while ago, but when I came to want it again I couldn't find it, so I've done this enhanced [url=http://w…
...
call $33b4 ;STACK_NUM
rst $28 ;FP_CALC
defb $2e ;str ...Graph Plothi! please, help with code: [PHP]For x=-100 To 100 For y=-100 To 100 If (x/2-25)*(x/2-25)+(y-50)*(y-50)<200 Or (x/2+25)*(x/2+25)+(y-50)*(y-50)<200 th…
Here's a much quicker version; the BASIC now only takes 50 seconds, and the assembler is reduced from 318 secs to 17 secs. There's still scope for further improvements. The significant change is that it only executes the inner Y loop with valid plot points ...calculator and sinusok, look at the Sysel's routine: [PHP]3 5b00 *s 4 5b00 tabsin = #7000 03 mksin 19.11.1995 Busy soft …
[CODE] rst #28
db 34h ; ; 34 stk_data< ...SE Basic IV Buffy v4.1 source (WIP)I've been doing a major refactor on the SE Basic source and I'd appreciate a code review from anyone who has time to look at it. I've almost certainl…
... fdel ; remove from calculator stack
fce ; exit calculator
... org 0x2cda
nxt_dgt_1:
rst get_char ...
fce ; exit calculator
rst next_char ; get next character ...
