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Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... why the usual documented T-states (contention start at 14335) differ from ... the start and end T-states experience contention, not the one following ... T-states 14338-14343 experience memory contention.
The memory contention timing ... -
Contention and floating bus timingHello, I was recently playing a bit with memory contention and floating bus stuff in ZXDS and there is one thing which puzzles me a bit. It is the d…
... why the usual documented T-states (contention start at 14335) differ ... , the FAQ clearly states the contention starts at 1 cycle ... instruction, the contention starts 2 T-states before the contended ... is contended by the memory contention!!)[/QUOTE]
... -
I seriously think I've had enough of the USAThis morning has just made me wish I was back in blighty, I don't know how much more of living here I can handle. I can't believe I married into som…
... know, I've been around 24 states now..and this is about ... -
I seriously think I've had enough of the USAThis morning has just made me wish I was back in blighty, I don't know how much more of living here I can handle. I can't believe I married into som…
... know, I've been around 24 states now..and this is about ... -
SimCoupe 1.0 released[size=-2](for those of you that don't read CSS)[/size] SimCoupe, the SAM Coup? emulator, has been updated to version 1.0. This major release adds ma…
... br />
- Fixed ADC HL,rr incorrectly setting N flag
- Fixed ADD IX/IY,rr failing to set carry for ... in 24-bit mode [Win32]
- Improved efficiency of contention table ... and CPU register power-on states
- Improved DAC interpolation ... -
Memory Map/ContentionHi I'm new to speccy coding (well I did some z80 coding a few years back - like 20yrs ago :) ), and I'd like to get back into writing some scrolling…
... a correct map for memory contention?
Address Size Area ... /> 5800-5Aff 768b Attribs 32*24 bytes
5B00-7fff 08k ... -
I/O contention model questionHi everyone, Sorry for my poor english. Together with a friend we are working on ZX Spectrum 48k implemented in FPGA. We have found bug in the Spect…
... I/O contention.
The 48k Reference states:
... " These two effects combine to lead to the following contention ... 40 - 7F? | Low bit | Contention pattern
------------+---------+-------------------
No | ... -
AND,XOR,OR,BIT,RES,SET,CPL,NEG,RLC,RRC,SLA,SRL,RL, RR,SRA for BASICAs this was drifting away from the original INKEY$ thread I thought that I'd create a new one. So here's a routine to provide all of the above mentio…
... =N, RLC=(,RRC=), SLA=, RL={, RR=}, SRA=]
;operation # on variables ... ,"= ";USR 40021+VAL "),a"
24 PRINT "SLA ";a,"= ";USR 40021 ... +VAL "{,a"
33 PRINT "RR ";a,"= ";USR 40021+VAL "},a ... -
28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... DEFB 0
DEPTH DEFB 24
HIATT DEFW 0
LD A,24
LD (DEPTH),A
states, just at the start of the contention-free period ... *224 t-states, just at the start of the contention-free period ... -
24-Wide or 26-Wide Multicolour Tile EngineI've been playing about with more multicolour routines (8x1, 8x2 etc.) and have one a bit clever and suitable for a tile-based game. No particular d…
... .
It can be 24-characters wide and (up to ... ) 24 characters high, i.e. a ... /+2. The 48K and +2A contention scuppered it. -
Movin And A Groovin Horizontal Flip improvementOn the left is the flip horizontal portion from Andy Pennell'S excellent Movin' & a Groovin' machine code screen routines from Your Spectrum #19 (Oct…
... 's ate away the t-states.
Then the POP/ ... rrca ;a=HABCDEFG
RR C rrca ;a=GHABCDEF
LD B,24 LD B,24
FLATTR LD A ... -
Understanding contentionI'm trying to understand contention and its implications when some "weird" bus cycles (such as I/O cycles with I/O addresses in the contended memory …
I'm trying to understand contention and its implications when some ... both memory and I/O contention. Memory contention causes T1 to be ... memory contention makes T1 to be enlarged 6 T-states if the ... for instance, to avoid memory contention) that begins at the ... -
Has any programmers recently pushed the spectrum to the limits?Hi there. Ive just discovered this great forum and I was brought up with the speccy 16,48 and then 128k. Im just wanting to know if there are any re…
... DEFB 0
DEPTH DEFB 24
HIATT DEFW 0
LD A,24
LD (DEPTH),A
; Hit here at 14164 t-states
LD SP, 5820H ; Load ... ; Hit here just as the contention-free period starts - start pushing ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... tightest corners in Pacman were 24 pixels between turns - 16 for ... time, 8 T-states when contended. The RAM contention pattern on a ... 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore a loop ... containing 40 (16+24) 4T instructions will take one ... -
Mr Do! ?Not exactly a new idea (at least twenty-seven years old now :-o), but how about a port of Mr Do! to the Spectrum? There was never an official one, ev…
... tightest corners in Pacman were 24 pixels between turns - 16 for ... time, 8 T-states when contended. The RAM contention pattern on a ... 128T (16*8 ) contended, 96T (24*4) uncontended. Therefore a loop ... containing 40 (16+24) 4T instructions will take one ... -
BUG in zxspin and SpecEmu - read Loading speed in WAV fileI'm created a new save, but it can run at 44.1 KHz, to test it, i make a new file from WAV 44.1 KHz to 88.2 KHz. Load this file in a emulator zx-spin…
... . I capture some T-States between two OUT.
... , fails maximum of 184 T-States.
What ... 184 T-States T-States or 184 more. a 4.24% error ... 16 * 4341 = 66288 T-States, the frequency changed.
... 80f0 c6 40 $07ts
rr c ; 80f2 cb 19 $ ... -
Incorrect Spectrum +3 emulation: different results on Fuse and SpecEmuWhen developing and testing [URL="http://www.worldofspectrum.org/infoseekid.cgi?id=0027591"]Rotatrix[/URL], I noticed different results on Fuse and S…
... to be as much as 24 T-States between ZXSpin and, basically ... so it's already in contention. Successive lines line up too ... the line-by line memory contention. The problem has always been ... two lines in succession, in contention, it's fallen into synch ... -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... , the T column the T-states that number of executions would ... loop is now only executed 24 times, and the reduced number ... /> rr l
rr h
rr e
rr d
rr c
rr ... -
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... DE,nn ; columns 23 and 24 (*)
LD BC,nn ... PUSH DE ; columns 23 and 24
PUSH HL ; columns ... tolerance" of about 35 T-states against interrupt delays.
... synchronization". Luckily, lack of contention makes it run faster, ... -
A new full-screen bicolor engine called NIRVANA[I]OK, there's something I need to clarify first: Nowadays if you write [B]"multicolor"[/B] everyone assumes it refers to "multicolor 8x1" (an attri…
... DE,nn ; columns 23 and 24 (*)
LD BC,nn ... PUSH DE ; columns 23 and 24
PUSH HL ; columns ... tolerance" of about 35 T-states against interrupt delays.
... synchronization". Luckily, lack of contention makes it run faster, ... -
New bicolour game coming very soon.And they say budget software houses can't afford to advertise :-D [IMG]http://i1142.photobucket.com/albums/n608/daveyboyhughes/elstompo_advertsmall_…
... DE,nn ; columns 23 and 24 (*)
LD BC,nn ... PUSH DE ; columns 23 and 24
PUSH HL ; columns ... tolerance" of about 35 T-states against interrupt delays.
... synchronization". Luckily, lack of contention makes it run faster, ... -
30-column 8x2 multicolor (even in 48K)I don't recall any 8x2 multicolor routine for 30 columns that would work on all Spectrum models (including the Spectrum 48K), so I decided to write i…
... ,80 (put 4,5)
(24-25,26-27 shown) ld ... bc ;+304,312 (put 25,24)
(26-27,28-29 ... .
Numbers are T-states starting from +0 (the last ... ). These numbers are written for contention scheme 7,6,5,4 ... -
The Quiz to end all quizzesHere it is - The Quiz To End All Quizzes. You will have a whole [B]month[/b) to answer the questions presented here. 1. All answers give 1 point un…
... Defense Initiative) of the United States and you must arrange it ... the main menu?
24. In which city from a ... -
Better late than never: the answers and results of the Quiz to end all Quizzes!First of all I would ask to excuse myself with those who have been waiting for the answers. But, besides work, study, etc., I had problems in verifyi…
... Defense Initiative) of the United States and you must arrange it ... menu?
Colony
24. In which city from a ... -
spectrum in united statesIs there any way to use a Spectrum in the United States? I notice all the ones I have seen on ebay have a power plug very different from the kind use…
... a Spectrum in the United States? I notice all the ones ... -
XarkLooking through my collection of games I came across Xark. The MIA states that its by Contrast but my version says HITECH. I'm attempted to make it …
... came across Xark. The MIA states that its by Contrast but ... by: madmekon on 2002-12-24 23:33 ]
[ This ... -
OT, but I thought this was funny...I was clearing my hard disc out a few days ago, and I found the following, that I'd downloaded some time back. Re-reading it, I again thought it was …
... . Delegates from the original 13 states formed the Contented
Congress ... the Constitution of the United States was adopted to secure domestic ... ruined Booth's career.
24. Meanwhile in Europe, the enlightenment ...
