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If you've got a real working MF128,IF1, and MDR combo can I ask a favour?So, if you do have a real Multiface 128, Interface 1, Microdrive and, oh yeah, a Spectrum (48k or 128k) that are all working, can I ask a favour...? …
... invoke with:
;
; PRINT USR 32768
;
; a result ... (err_sp),sp
ld bc,0 ; clear bc
ld de,gethook ... address of HOOK-CODE in bc register
ret
;[/CODE]
[BASin] Bug report and question[B]1. Bug report:[/B] BASIC Editor behavior I'm using a variable to store the contents of the BC register. But the BASIC editor works strangely. I t…
... store the contents of the BC register. But the BASIC editor works ... />
[code]10 LET a=USR 32000
20 PRINT a ... />
[code]10 LET a=USR 32000
2020 PRINT a ... :[/B] Other than typing "randomize usr 0" on the editor is ...Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…
... /> ld sp, (spp)
pop bc
ret
spp ... a PRINT USR expression. But the contents of the BC register aren't ... underscore) in place where the BC contents should be seen. What ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... 0 to 65355 in the BC register.
We will ... the value 0 into the BC register, ready to increase it ... a value into a register or register pair.
The ... is different for each register or register pair that is ... 0; "Your score was "; USR 33000
Now RUN the ...Can a guy that traveled on the short bus learn machine code...Hmmm So after some soul searching I figured it was time to finaly nail spectrum machine code. Its so frustrating to sit infront of a basic listing w…
... returned, you type in PRINT USR 61440 (or whereever you decided ... with a value
Increment register BC
Return
... a
[code]
PRINT USR 61440
[/code]
... to copy the manipulated register to the BC register pair so it can ...ZX rom type detectionHere is routine for fast detection of zx rom / computer model. [URL="http://velesoft.speccy.cz/other/ZXROMDETECT.zip"]http://velesoft.speccy.cz/othe…
... zx48 rom and return in BC register value 0-7 signed zx ... be code used via PRINT USR xxxx
[B] ... address (#09AC).
Routine return register BC=0-7 for ZX rom ... (C),A
LD BC,0
LD A ...Calling machine codeOccasionally I see on ZX computers (mostly the spectrum, but I think also the '80 and '81), how someone made their machine code and wrote the bytes i…
... like this:
[code]PRINT USR 60000[/code]
If the ... leaves an integer in the BC register, then that integer will get ... can also do
[code]USR 60000[/code]
if you ... sometimes see
[code]RANDOMISE USR 60000[/code]
Can someone ...How do i learn to programAll the years i had a computer the only one i could program was the Texas Instruments Ti99/4a and when using extended basic with its so simple sprite…
... ,201)
Then type USR 32767 [ENTER] and you ... machine code to load register A with 100. Pretty ... br /> Poke that in then USR 32767 again.
This time ... the contents of the BC register pair when it returns ... LD (BC),A) and increases PC. In BASIC USR xxxxx will ...Why Hex in place of Denary?Ok - most MC books / tutorials advocate the use of hex instead of denary. But the Speccy doesn't actually have a Hex converter so you need to write …
... USR xx function always returns the contents of the BC register ... to BASIC. So PRINT USR 30000 has two effects ... />
PRINT USR 30004 will jump into the ... /> So if the A register still contains 6 from before ...
PRINT USR 30000 (run the routine at ...Emuzwin / Spin AssemblerHello lads. Wondering if anyone can help. I've decided to look into playing about with some code using the Emuzwin or Spin built-in assembler. Are th…
... machine code", RANDOMIZE USR "Address..." or LET L=USR "address...". There are ... BASIC operates the USR function returns whatever the BC register is holding. So ... entering PRINT USR 60000 would ...Pocket Clive - 2 QuestionsHello, I've just started using Pocket Clive on my iPaq pocket PC, excellent emulator BTW. 1. I have just wrote a small BASIC program to randomly pi…
... FRAMES byte, and the r register. The resultant 16 bit value ... SUB 210
30 RANDOMIZE USR 65268
40 LET s ... /> ld a,r ; the refresh register is used for the low ... ; return the result in the bc register pair
That seems ...Noob to Z80 needing +3 helpI'm quite new to z80 programming, but i'm attempting to write some kind of windowing system that will run alongside BASIC on my +3 with Kempston mous…
... gets whatever was in the BC register pair. To communicate parameters ... the end of the USR call and read them ...
[code]
let r = USR 32768: REM move 3,100 ... ,20
let r = USR 32768, "move 3,100,20 ... "
let r = USR 32768, "move", a, 100, ...question about RST 10hhow do you set the position of the text when using 'RST 10h' to print to screen?
... />
Same as PRINT : RANDOMIZE USR START
[/quote]
BC-register)New utility - Arcade Game DesignerNo income tax, no VAT, no money back, no guarantee... In advance of SEUD's release I thought I'd release AGD to get people in the mood for game maki…
... back to AGD with Rand Usr 24000[/QUOTE]
That ... 't restart with the rand usr.[/QUOTE]
Thanks, I ... in the BC register pair. In other words, LET S=USR 34100 would ...New utility - Arcade Game DesignerNo income tax, no VAT, no money back, no guarantee... In advance of SEUD's release I thought I'd release AGD to get people in the mood for game maki…
... in the BC register pair. In other words, LET S=USR 34100 would ...Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…
... a PRINT USR expression. But the contents of the BC register aren' ... underscore) in place where the BC contents should be seen. ... LD SP, the POP BC is going to cause problems ... that's going to BC is from 2 addresses ... ahead. Maybe a simple, LD BC, (SP) will do the ...Understanding the StackSorry folks. I guess I'm going to be a pain for a little while. Hope it's ok with everyone. I'm currently studying the stack and wrote the little pr…
... the call from BASIC the BC register holds the value of the ... print from the USR command
PRINT USR start
[code ...Randomize usrHi, I've often wondered why/how they came up with RANDOMIZE USR <memory address> to invoke machine code couldn't they have used a better keyword (e…
As Arjun says, [b]USR x[/b] is a [b] ... useful (the contents of the BC register pair forms the integer return ... would all be using [b]USR x[/b] on its own ...Howto paint a squared zone of the screen ?You know what guys ? i begin to love this languaje. Cant understand why not put more effort on the 80's to learn it :( because it is really speedy. …
... need to place it into BC register. So, you need to do ... row number as result of USR function.Another machine code problem, sorry[CODE] OPCODE HEX ADD LD A,00 3E00 F000 PUSH AF F5 F002 LD B,05 0605 F003 LD C,06 0E06 LOOP F005 POP AF F1 ADD A,C 80 DEC B 05 …
The way USR works is it's ... .
When you do "USR address" it executes the machine ... number that was in the BC register pair. So you can do ... :
LET X = USR 61440
Then your ... address you called in the register BC. This isn't hugely ...Random numbers...Hi Folks, I am not an expert when it comes to random numbers. If I have the RANDOMIZE statement the beginning of a program and then proceed to gene…
... screen. Each "call" uses RANDOMIZE USR... - could this be affecting ... ?[/QUOTE]
The USR function invokes an assembly routine ... the BC register pair). In your program, replace [B]RANDOMIZE USR x[/ ... you are using [B]RANDOMIZE USR x[/B], every time ...Random numbers...Hi Folks, I am not an expert when it comes to random numbers. If I have the RANDOMIZE statement the beginning of a program and then proceed to gene…
[QUOTE=Einar Saukas;532515]The USR function invokes an assembly routine ... the BC register pair). In your program, replace [B]RANDOMIZE USR x[/B ... ] with [B]PRINT USR x[/B] to see this ... you are using [B]RANDOMIZE USR x[/B], every time you ...RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... complete, I type the RAND USR command and it works.
register keeps the value I manually ... the value of BC' at startup is now in BC register.
register with $FFFF at reset, the RAND USR works. Strage ...Where to start?..Hello, First off, sorry if this is in the wrong and sorry if the questions I'm about to ask have been asked and answered numerous time! Little back…
... br />
The BASIC function "USR 32768" or whatever will try ... processor's 'BC' register pair ('BC' is a 16-bit register that's really ... the 'result' of the USR function. Usually you just want ... for example:
LET X = USR 32768
Whatever you ...Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... .
Then use LET A = USR 60000 or wherever it's ... /> What happens when you do USR 60000 in BASIC is the ... the number 60000 into the BC register and calls the routine. When ... BC register at the time is returned as the result of the 'USR ...Xor-shift random number generator for Z80[QUOTE=Patrik Rak;320244]Come on, people, [URL="http://www.jstatsoft.org/v08/i14/paper"]xor-shift generators[/URL] devised by Marsaglia, that's the w…
... .
Then use LET A = USR 60000 or wherever it's ... /> What happens when you do USR 60000 in BASIC is the ... the number 60000 into the BC register and calls the routine. When ... BC register at the time is returned as the result of the 'USR ...OpenSE BASIC 3.1.1The eagle-eyed will have noticed that [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]SE BASIC[/url] got an update last week. As a te…
... FN handling, but because the USR function doesn't return the ... implementation of the USR function didn't return the BC register value. That ...OpenSE BASIC 3.1.1The eagle-eyed will have noticed that [url="http://www.worldofspectrum.org/infoseekid.cgi?id=0027510"]SE BASIC[/url] got an update last week. As a te…
... FN handling, but because the USR function doesn't return the ... implementation of the USR function didn't return the BC register value. That ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... 0 to 65355 in the BC register.
We will ... the value 0 into the BC register, ready to increase it ... a value into a register or register pair.
The ... is different for each register or register pair that is ... 0; "Your score was "; USR 33000
Now RUN the ...need a new method for m/c parameter assignmentI've been using a variable length function of the form: "FN a$(a$,a[,b...,z])=STR$ USR md" to search a data table and return a string result. By putt…
... $(a$,d1[,d2...,dn])=STR$ USR md:
LET a$=FN ... that "STR$ USR md" does not return "STR$ 'BC register'"; it returns the ...
