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Beginner InfoI have trying to find some hardware information for use with assembly coding but havn't had much luck. For instance. How do I redirect the vertical …
... bit address by using the I register in the top 8 bits ... causes the word at address (I+255),(I+256) to be read ... routine that is able to register any number of ordered hooks ... -
ZX80 software wanted for a ZX80 siteHi everyone - I'm putting together a site about the ZX80 - I've noticed there's virtually no software available for it on the net so that's the part …
... is check the IX and I register. Normally, IX points to the ... displays the picture and the I register points to the character set ... memory.
If the register changes, they scan memory for ... you are refering to, I beleive is the difference between ... -
Games that crash because of contended memory.I find these are really annoying. You load up a game like Astro Marine Corps, Fantasy World Dizzy, Dizzy: Prince Of The Yolkfolk and so on (the init…
... />
Cisco Heat (Move I table):
POKE 31502,135 ... , but those who know what I mean will understand...
< ... /> This game always has the I register pointing at 0x77 (119), so ... a jump command, change the I register and voila - Robocop 3 running ... -
Codies help? Werewolves of LondonHi All, never one for shying away from the deep end, having only just dipped my toe in to the world of machine code I find myself trying to find out …
... area?
[/quote]
I agree with Dunny, sort of ... for a videogame.
I think the vast majority of ... /c programmers.
If I were to design any multitasking ... compare the contents of the I register and state of interrupts (which ... -
Assistance with IM2 routineI subsequently got a working IM2 routine.
... /> When the interrupt occurs, the I register is used as the high ... -
Assistance with IM2 routineI subsequently got a working IM2 routine.
... , aowen wrote:
Thanks. I knew it had to be ... something simple. I just don't understand why ... putting $fd in 'I' doesn't jump to $ ... call.
As I understand it the reason for ... is the value of the I register.
In a ZX ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... id is combined with the I register (with I the most significant 8 ... subroutine address stored at (I*256+0), (I*256+1) and peripheral ... subroutine address stored at (I*256+2), (I*256+3). Had peripheral ... /> Since we can change the I register to whatever we want, we ... -
Ebay - a couple of questions.Well I've been buying stuff from ebay india, but I was wondering if I'm allowed to buy stuff from other ebay locations like ebay UK and USA. That is,…
... . That is, even though I'm registered on the indian ... UK site? If not, can I register on the UK site and ... from overseas Ebay sites, I'm pretty sure your registration ... is global. I registered with ebay.co.uk ... com without having to re-register. -
Ebay - a couple of questions.Well I've been buying stuff from ebay india, but I was wondering if I'm allowed to buy stuff from other ebay locations like ebay UK and USA. That is,…
... That is, even though I'm registered on the indian ... site? If not, can I register on the UK site and ... />
Also, last night I was outbid by someone who ... the item except me. I can't imagine someone watching ... often?[/QUOTE]
i never bid till the last ... -
Ebay - a couple of questions.Well I've been buying stuff from ebay india, but I was wondering if I'm allowed to buy stuff from other ebay locations like ebay UK and USA. That is,…
... site? If not, can I register on the UK site and ... />
Also, last night I was outbid by someone who ... the item except me. I can't imagine someone ... second. Sniping is good ! I havent lost out to any ... fellow snipers, i normally always put my maximum ... -
The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…
Though think of the I register in the $40-$7f range, the R register and memory refresh cycles :)
This is only my first attempt at controlling an effect that's been known about for years! -
Restore Registers Returning to BASICI should really know this, but I've not written code that requires a return to BASIC for a loooong time. What registers need to be preserved / resto…
... the EXX' would help.
I've actually got the code ... altering the I register but that made no difference. I think I've just ... missed something simple, tho' I was gonna look at it ... -
RealXThis may be a dumb question but will RealX ever get released?
... the values of the I register and the R Register, combined to form ... , this happens because when the I register falls in the range 0x40 ...
A7-A0 = the R register of the Z80
[/quote ... -
The BASIC ISRFirst of all, excuse me if my blatant ignorance about this topic makes me write some nonsense :) The thing is that I'm finishing a game in mixed BAS…
... at the value of the I register, and uses this as the ... interrupt routine, you then LD I, A (where A is the ... /> Does that make sense? Sorry, I'm kinda thinking this as ... I type :)
Contrary to ... -
Urgent Help needed to fix this: calling all machine code gurusI am currently trying to write tutorials on the amazing Orfeus music composer by Proxima which allows you to do multi channel music through the beepe…
... that to use the labels I think is the first problem ... be a problem setting the I register to #3b when in IM ... if that works.
I'll look more after lunch ... -
Urgent Help needed to fix this: calling all machine code gurusI am currently trying to write tutorials on the amazing Orfeus music composer by Proxima which allows you to do multi channel music through the beepe…
... (with the modifications I mentioned above regard the BC register), and you ... , and it'll alter the I register, so you'll need to ... .
If I had more time I'd rip out the ... for you... but right now I don't have the time :/ -
Lunter's Z80 RegistrationHow can I register or crack Z80 v4.0 Please someone answer me.
[QUOTE=chixus;23135]How can I register or crack Z80 v4.0 ... />
To crack? No. To register? Z80 is not so good ... -
Russian clone of ZX-Spectrum 48kThe classic russian clone of ZX-Spectrum 48k [URL="http://sblive.narod.ru/ZX-Spectrum/Leningrad48k/Leningrad48k.htm"]http://sblive.narod.ru/ZX-Spect…
What are your questions? I can consult you.
... storage. It has the only I/O port - #FE (it ... , by access to any I/O address). This creates ... with #40...#7F values in I register, nothing breaks. In fact ... analog, with expansion slot. I beleive PCB can be retraced ... -
He's back......and he's got a new trick! AY Chip here. I've been away far too long. I would like to announce 'HatStand': for no adequately explored reason, I h…
... . The Z80 then takes the i register and uses that as the ... -
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…
... particular values of the I register.
[I]Edit: Sorry, ... as Patrik points out below.[/I]
[QUOTE ... .
[QUOTE]I already read this in your ... two.[/QUOTE]
I don't take the table ... as matter of fact - I point out that it ... -
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…
... " with particular values of the I register.[/QUOTE]
In fact ... QUOTE]
Oh, I see. I got it as that the ... />
Hmm, the data sheets I have seen explicitly mention the ... /> Thanks a lot, Chris, anyway. I really appreciate that you waste ... -
IM instruction - danger Will Robinson!!! :)Here's something I've wondered about for years: On page 102 of "Mastering Machine Code on your Zx Spectrum" by Toni Baker, there's an instruction li…
... the CPU looks at the "I" register and uses that as the ... -
ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... refresh cycle when the I register is at that magic ... .
Incidentally, I think you'll also find ... the lower 16K !!!! Mad I know! Issue 1 machines ... not have this resistor. I am currently investigating this.< ... will be out soon! I will also be releasing ... -
ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... .
However, I've been sifting through the ... and service guides and I think that NEC4116 chips ... />
Also, can I offer the following as proof ... only occurs when the I register is set to a ... .
Sorry I had to rush that description ... -
New tape releases - 128K only?As Jon's new Egg-Head game is 128K only, and splATTR has also evolved into a 128K only game - both due to memory constraints - I was wondering if the…
...
This program modifies the I register in the game due to ... t, it changes the I register so it points to 15359 ... it somehow.
I also had a +2A. Games ... above. 99% of games I tried, I made them work. Note ... worked for me, though. I had an MCM re- ... -
Blizzard's Rift in Spinanyone else having trouble playing blizzard's rift in spin, the game loads ok, you can select controls, select a system to visit but when you select …
... models - anything that set the I register in such a manner that ... -
48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…
... ).
[I]On a side-note, I wonder if setting ... crash even in 48 mode?[/I]
3) ... but Short Circuit 128 as I mentioned earlier is another) ...
8 ) Writing to I/O ports. Some games seem ... the 'snow' effect (setting I register between $40 and $7F) ... -
48K games that don't work on a +2Not sure if there is already a thread about this but recently I've noticed some old 48K games will not run on my +2 - even in 48K mode. Examples are…
... but the 'snow' effect (setting I register between $40 and $7F) will ... on a 48 machine. I'm not sure how + ... />
[/QUOTE]
I use a +2A with SE ... it (as mentioned) and I have never seen the snow ... effect occur ever. (I have seen it on a ... -
Boiler Room ScamsTonight I was called by boiler room scammers. In case you don't know what these are, they are people who cold call you, tell you of an AMAZING share …
... Telephone Preference Service too and I'm starting to get ... claiming you need to re-register every twelve months - which ... saying i have to re-register. Overall its been pretty good, i get ... it.
When i register with websites i never put my home ... -
ZX128/+2 unrainer (HAL10H8)[url]http://velesoft.speccy.cz/zx/umbrella/umbrella.htm[/url]
... in NMI menu is bad I register value detected. If software ... switch off unrainer and register I will refresh to original ... original I value. Software unrainer test this bad I register values:< ... br /> ZX48 - I= #40-#7F< ...
