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Any interest in new low-cost mass-storage interface with 512K RAM?I've recently added support to ResiDOS and the +3e ROMs for SD/MMC card interfaces; in particular, ZXMMC (which has no onboard RAM and so is only sup…
... to crate a non-volatile RAM disk one of the best ... /> It works like normal static RAM (no burst mode) but retains ... and some logic to select upper or lower byte and interface ... -
Wanted 10 - 4116 Ram ChipsHi Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minimum of …
... :
"4116 - Dynamic RAM NMOS 16kx1 150nS 16-pin"
or
"4116 - Dynamic RAM ... /> They also have "4164" (Dynamic RAM NMOS 64kx1) in versions from ... -
Wanted 10 - 4116 Ram ChipsHi Can any one help I am trying to get hold of 10 4116 RAM chips for a 48K Spectrum. Does any one know who might stock them. I can get a minimum of …
... :
"4116 - Dynamic RAM NMOS 16kx1 150nS 16-pin"
or
"4116 - Dynamic RAM ... /> They also have "4164" (Dynamic RAM NMOS 64kx1) in versions from ... -
Zx Spectrum Laptop (again)I've been reading all the old treads about a possible portable speccy. I even found the one about the Speccy Laptop. But it seems there's a lot of ne…
... 16K pages), single 512K static RAM (I think this can be ... the voltage regulator in the upper left doesn't even have ... -
TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…
Won't initialize above 16K RAM - well, either A15 on the ... the chip select for the upper 32K is fried. It's ... between the lower 32K and upper 32K based on the state ... -
TV Modulator. Can it be repaired?Is it possible, to repair tha TV modulator (after removing it) if it gives wavy picture? I replaced both transistors (tr1/2) and both electrolytic ca…
... than the 7805, but the upper 32K RAM runs off just +5v ... -
Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
... , with the top of physical RAM (PRAMT) being set at 32768 ... lines.
consider dodgy Ram chip A.
Setting ... (both bytes in the same ram chip) the program outlined above ... 170 sets the whole of upper memory to 170, again the ... -
Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
... keeps going to the same Ram chip when a fetch or ... should be going to an upper memory chip the program won ... always going to the same RAM chip ........
HMMMM .... it ... -
Anybody fancy coding this?blah de blah de blah Please ignore, poting error.
These days, use flash - don't bother with eprom. You can replace the ROM by making an external board that connects to the edge connector, and nails ROMCS high just like ZX Interface 2, so that the on-board ROM never gets selected. Simple decoding logic ... -
Spectrum 48K ROMHi Can anybody help I have an Issue 6a Circuit Board which has a faulty ROM Chip. Is it possible to program a ROM Chip with the 48K ROM and fit it as…
... 6a circuit board has the RAM selection jumpers for OKI and ... middle of the board the upper one is marked [B]IN ... holes, at the moment the upper two [B]IN[/B] holes ... are bridged and the upper two [B]Out[/B] holes ... -
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…
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which will show up RAM errors in the lower part ... higher part, the upper 32K and the bank-switched RAM. And you ... press the red button. Bingo RAM and ULA I/O diagnostic ... -
InterfaceHi I'm building a spectrum emulator. I've tried to build it as modular as possible, for example I have a zx class that have input and output devices…
... a Spectrum (both ROM and RAM) has what are known as ... 16K bank or upper 32K bank (the way the RAM gets selected ... -
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.
... am after a 48K spectrum RAM chip: [B]TMS4532-4[/B ... the lower bank to the upper bank, and from the ROM ... -
Disable onboard memoryWould this work...? Access to onboard I/O can be disabled by holding IORQGE high. Would it be possible to create a MEMRQGE in a similar way to disa…
... the onboard RAM. (I'm only thinking about the upper 32K which ... -
Yesteryear's Computers.Ahhhh ... [URL="http://www.computerworld.com/action/article.do?command=printArticleBasic&articleId=9023960"]back in the day[/URL] when a 300mb system…
... mobo (XT clone), with 1MB RAM, monochrome graphics, 12" amber monitor ... created a 360KB RAMdisk (on upper memory) so I could load ... -
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
... certainly the lower 4116 RAM. The ULA normally gets ... does so because the lower RAM went bad.
RAM. Refer to the diagram ... changing out the 4116 RAM. You'll probably find ... 16K because it has an upper memory fault).
Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
[QUOTE=swift240;202206]Just had a look at the old style C64 diagram the RAM chips in those are 4164.[/QUOTE]
You can use those in the UPPER memory block.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…
... ". However we must still allocate RAM for this array with a ... plot g_land[45]". All such RAM allocated to gobal variables with ... ,4]. You will find the upper part of these ranges in ... using the amp2[] array containing upper ranges for all 9 outcomes ...Poorly Spectrum + Fault diagnosis help needed!Hi, I've got a Spectrum+. Sometime in the past I broke it and sent it off to be fixed. It came back working good as new, but with an issue 2 board i…
Thanks to the kind RAM chip doner, I got the ... that I discovered that my upper 32k wasn't working. Using ... a speccy with dead lower RAM. :???:
I think this ...+2B problem stillHi all, I have a spare +2B that still dont work. Richard kindly sent me 4 x 4464 ram chips but the +2B still dont work I have swapped over both ROM`s…
Oh well, that means I have 4 RAM chips, 1 Z80, 2 ROM`s, 1 upper case, 1 lower case, 1 Tape deck.
Couldn`t find the partridge in the pear tree.Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... - all working bar the upper 32K RAM since one of the chips ...Speccy just snuffed it while playing 3D Pinball :(I have two speccys but the one I use most has just given up the gost! :-( game froze up and now all I get is flashing patterns and lines:-( Everyt…
... - all working bar the upper 32K RAM since one of the chips ...Wtf??I won this NZ auction earlier this week [url]http://www.trademe.co.nz/Browse/Listing.aspx?id=116509561[/url] and have been to collect the hardware th…
... of any 32K chip (static RAM, EPROM, ROM, flash - whatever, it ... high when you want the upper half, A14 low when you ...At the Carboot sale today.Today at the carboot sale I picked up An Acorn Electron -I see these all the time, An Official Branded BBC Micro Datacassete Recorder - I'v…
... shortly after too (bad lower RAM). Before I repaired it, I ... machine's motherboard has bad upper memory and is currently on ...At the Carboot sale today.Today at the carboot sale I picked up An Acorn Electron -I see these all the time, An Official Branded BBC Micro Datacassete Recorder - I'v…
... shortly after too (bad lower RAM). Before I repaired it, I ... machine's motherboard has bad upper memory and is currently on ...A vexatious questionThis is kind of a follow-up to a question about RST #8 and hardware that I wrote in the development forum a while ago. To summarize that: certain ha…
... bus is for the upper 32K of RAM). But there's still ...Gamasutra article on the er.. other computer.I know that some of you own and love the c64 (heretics!). This article may probably interest you: [url]http://www.gamasutra.com/view/feature/1991/a_…
... working Spectrum (no case, no upper memory, issue 4 board), and ... hard disc and extra sideways RAM, the other with a plain ...4116 and 4164 chipsI've just found the following supplier for 4116 and 4164 RAM chips. about $0.80 each.. not bad. [url]http://www.jameco.com/[/url] It's a US site. I…
... (or other species of Spectrum upper memory, so long as the ... means a memory speed of 150ns, the rest after that usually ...Changing the colour of the loading 'stripes'I was wondering if it were possible to alter the default colours of the standard ROM loading 'stripes' via BASIC, mabye a POKE command of some descri…
I'd also like to point out that to get the ROM routine working properly from RAM it needs to be in the upper 32K of memory.Changing the colour of the loading 'stripes'I was wondering if it were possible to alter the default colours of the standard ROM loading 'stripes' via BASIC, mabye a POKE command of some descri…
[QUOTE=ghbearman;227871]I'd also like to point out that to get the ROM routine working properly from RAM it needs to be in the upper 32K of memory.[/QUOTE]
Why is that?
