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Testing RAM Chips After RemovalHi I am going to use Winstons Hot Air Gun method of removing the RAM chips from a 4S circuit board. I wish to check the RAM chips, I have a Logic Pr…
... still on the Spectrum itself because you're going to have to refresh it ... , and be able to load and ... . This is of course presuming the Z80 works (you can usually tell ... . It uses LEDs so if the ULA is also toast, you can ... -
GrrrThere's nothing more annoying than finding out that you've managed to bridge /RAS and A3 on the bank of 4116s while putting in sockets. Naturally, th…
... my drill press instead of going over it with a solder ... . Then 8 new high quality sockets (the ones with the round pin holes ... testing the repair, I came back to the work bench to find my Z80 project ... -
Reading the border colorI am building a snap-button to my ZX-PC Interface. Is there a way to read the bordercolor which is set by an OUT-command. (and please don't tell me …
... you're not going to exceed the fanout capability of the Z80's address and data ... can be as simple as the ULA if you like, and just ... whichever port you decide to use to read the stored value back. ' ... from the Spectrum, and to act as a chip enable to read the byte ... -
ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... a fair price for a ULA chip?
Think ... if the ULA is any good, so you have to test ... and physically post it to the person that eventually wants ... allowed in the UK, he's not even going to make 4 ... the +D units he sells? Where else are you going to ... -
ULA chipHi. Where i can find a ULA 6C001E-6 chip for an 3B issue Speccy ? Also looking for one 7805 heatsink... Thank
... doesn't sell the other bits, has to test the chip before he ... mobile phones!
To be honest, the demand isn't there ... ULA problem (but it probably is).
The other two "sound" simple to ... is not going to solve it, I have to learn how to make my ... -
Why the name "8-bit computer"?The Spectrum was called an 8-bit computer, but what does that mean? For modern hardware and operating systems (32 or 64-bit) it seems to be the poss…
... Sir Clive was designing the Spectrum, he was going to release it as ... different pieces. The case, the keyboard, the main PCB, the power supply, Z80 processor, 16K ... small packet of Chuntey to put under the ULA.
Because of ... -
48+k speccy with interface 1 and microdrivehi im having a sortout at the moment and am selling some of my spares. it's a un boxed 48k speccy (not rubber keys) with a un boxed interface 1 with …
... ebay but the prices seem to range from stupidly high to next to nothing.[/quote ... ]
I'm in the ... same boat, lol, I have no idea what the going ... rate is at the moment. As you ... -
PZX file format draft[QUOTE=Andrew Barker;186084]To this date, there is no rival format for TZX, despite people saying they can do better. Well the challenge is on, prov…
... pilot tone the first sync pulse should be high and the other pulse ... refers to what polarity the standard pilot tone (i.e., the tone generated by ... standard ROM save routines) should have. It tries to ... -
I wonder if . . .An M68k could emulate a ULA. You know, like the ZX80 used the cpu for rastering the picture on the screen. This would mean that the people who clone…
... used the CPU to drive the display raster, the ZX81 still had a ULA to finish the ... , but if you want it to be "high fidelity" (i.e. not ... got to have a very fast processor - realistically, for a high fidelity ULA ... -
Why the name "8-bit computer"?The Spectrum was called an 8-bit computer, but what does that mean? For modern hardware and operating systems (32 or 64-bit) it seems to be the poss…
... Sir Clive was designing the Spectrum, he was going to release it as ... different pieces. The case, the keyboard, the main PCB, the power supply, Z80 processor, 16K ... small packet of Chuntey to put under the ULA.
Because of ... -
UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.
... (the point of the resistors is to separate the ULA's access to the bus from the CPU ... - the output impedance of the 4116 memory must be quite high if the upper ... RAM could overpower its outputs through the existing ... -
UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.
... - the output impedance of the 4116 memory must be quite high if the upper ... RAM could overpower its outputs through the existing ... being read from the lower bank by the ULA.
To answer an ... -
+2B ram chips?Hi all, I have got 2 Plus2B`s and 1 Plus2 gray case. Ok the one Plus2B don`t work, so I tried to see if I could pin down the problem. I changed the …
RAM or ULA chip would be my major ... has obviously been inside it. The ULA can be done, but as ... yourself the bother of changing it. Test the RAM first, then the ROMs ... to know....
The thing is, not many people are going to want to ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... be explained in a high level manner rather ... be the address of the integer i, etc. A memory address, on the z80, ... going to use it as an int*. Then the assignment to ... the other. Note the 0 byte to mark the end of the string.
The address ... -
8-bit or 16-bit registers?I'm playing around with writing a Speccy emulator for mobile Java at the moment. I did a quick and dirty port of Qaop, which does run but at less tha…
... I'm guessing not) to access the high and low bytes of ... to access the high byte). The best use for the bytecode is usually to ... assess how best to ... br />
I'm going to plug away at doing more ... -
Notation questionI wasn't quite sure where to put this post, so anyone's welcome to move it whereever may be more appropriate. So I'm reading about Z80 interrupts he…
... , if an input is never going to be used, you can just ... the transistors on a Z80 are MOSFET) which is very high impedance (on the ... the high impedance state). For an output (such as the address bus) this means the ... -
is the great british pub dying?the pub i went to last night has closed, the landladys leaving it cos her 6months lease is up and shes moving to portugal to run a pub. she said its …
... the wife are going to Austin sometime this year cos' her high ...
Hardly the sort these hardcore gangsta types ... after the bats head to Sixth Street, which is the Number ... etc....be sure to leave the wife at home ... ordering drinks to attract the locals. -
Does anyone have any working Ferranti's?Does anyone know where I might get hold of a Ferranti ULA5C112E-3?? I think this is the problem with one of my rubber key 48K's as it otherwise wor…
... finks us be twas the ztx650 tr4 -5volts driver ... is goin out ta milk the bull.:-o
going to the pin 1 of IC6.:roll ... all your help and for the Ferranti ULA.
Regards ... ![/QUOTE]
Ahr, the gorn an fixed it ave ... -
B: drive dont workHi all, I went to Maplin today got myself a DIY lead the one with the proper 34 way edge connector for the Spectrum+3 other end 34 way to floppy driv…
... a 34 way header plug going to the +D interface, red ... both old ones that have the DS switches inside.
the twist, it switches round the drive to respond to a signal ... coming down the DS0 ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... high correlation between certain bits in successively generated random numbers. So, eg, the ... generated.
This came to my attention in the ... tables in order to generate the same distributions as ... the easiest way to do this is to take the program ... -
Platform Game Designer 2?I've started tinkering around with some code today and have decided upon a number of handy little features that it would be nice to have. For the li…
... play around to get the best results. Another way is to select the 3 or ... 's heavy going and horrendous to program in places. Much of the code ... generated when aliens are shot (should you want the ability to fire), or the ... -
Moving to the U.S.I've noticed that a few members here (Beanz, Andrew, etc.) moved from the U.K. to the U.S. Does that mean that the U.S.'s still a better place to liv…
... short term plans to move to the US bit I ... Lily likes it in the UK. For benifits such ... the cheap prices of our supermarkets.
But she hates the high ... taxes, the cost of eating out ... year, we are going to the US next week for ... -
Lucky or whatYou may have heard of freecycle. [url]www.freecycle.co.uk[/url] Some one the other night offered free Spectrum gear or it will go to the tip. I got…
... swapped over the Z80 black screen.
Swapped over the ULA same black screen ...
No idea if its the ... is Issue 2 but the Z80 has a wire going to pin 30 coming ... -
Anyone into anime?Hi I was just wondering whether any fellow WOSers are into anime at all? If you are, then I strongly recommend you watch a series called Monster. …
... high in the IMDB ratings, that's a result! I'm definitely going to ... catch up on that one, am I the only ... theme, which is bloody confusing to start off with, but worth ... -
Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…
... least I can try to give you a few ... so should have time to do some further work on ...
Yesterday, I was trying to work on this game whilst ... really concentrate on it properly to be honest, which is ... however I should be able to give it my undivided attention ... -
Probably NOT the 80s thing I'm nostalgic for...Compare the photo here: [url]http://news.bbc.co.uk/1/hi/uk/6957589.stm[/url] And the one about 3/4 the way down this page: [url]http://www.thunder-a…
... that anyone's going to put it to the test, so the risk seems slight ... exactly the same even during the Yeltsin years. The Russians understand the need to keep ... accuracy that rely on high-yield nuclear warheads to ensure they damage ... -
Bad things you did as a kidOk, fess up. What's some of the worst things you did as a kid? For me: (1) Almost burning a neighbour's hedge to the ground. (2) Wiping a big dog…
... />
My cousin had a high powered air rifle. When I ... deck window, which cracked. The bus came to a halt and stayed ... there until the cops arrived. Needless to say I got ... /> We also used to go "cat creeping" - going through as many back ... -
PC Power supply for SpeccyHi all, after 13 years with out playing spectrum games I am eager to play the old games. Thus I got up to the garret checking my old stuff. Two of m…
...
If a 4116 is going to go down, don't forget ... enough to make it hot enough to melt the case of the Spectrum ... may end up paying a high cost.
... . If you have to re-wind the coil, then do ... is used on the edge connector to power other stuff. ... -
Project: M.u.l.e.Wokani came up with a great idea about trying an open-development approach for spectrum games, and I thought why not try with a game I have under dev…
... generated map and this is where the map is initialized.
The ... we select a plot left of the river in column 4 to receive ... For each plot selected for the high deposit, a splash pattern ... Beginning at memory address "g_land" (the start of the array of 45 ...
