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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…
I was thinking not so much the power brick, ... a weak 7805 that's not regulating properly, although to be ... 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 ... lines.
consider dodgy Ram chip A.
ram chip) the program outlined ... 170 sets the whole of upper memory to 170, again ... 32767 to 170 does not affect any other memory ... -
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 ... -
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 ... is slightly different, but that's not important ... -
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 ... Spectrums.
I will not be requiring [I]any[/I ... for the that-which-shall-not-be-named system, thank ... what suffix they are (not at home right now).
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 ... my head. Hopefully I've not got /RAS and /CAS mixed ... -
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…
Almost certainly the lower 4116 RAM. The ULA normally gets ... warm ULA is generally not a sign of any ... does so because the lower RAM went bad.
RAM. Refer to the diagram ... 16K because it has an upper memory fault).
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…
... Since kroah's document does not completely specify the computer players ... However we must still allocate RAM for this array with a ... g_land[45]". All such RAM allocated to gobal variables with ... using the amp2[] array containing upper ranges for all 9 outcomes ...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…
... ghost moves back to the upper centre of the maze. This ... eating the ghost has been detected. This means sometimes the ghost ... by the player. I have not yet found an elegant solution ...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…
... the 32K eprom - there's not really any such thing as ... 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 ... their Spectrum collection is just not right. I'm truly disappointed ...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 ... with the Z80's PC not in an expected place, and ...BBC MicrosAny speccy peeps on here also have a collection of Beebs ? :) I have a fair few (and some accessories) , il try to get some pics later if anyone is …
... boxed BBC Micro that doest not work. I turn it on ... out both the upper and lower portions or Ram to see if ...sinclair zx spectrum issue 6a (again) - how to repairHi All, Is there someone who may explain what these jumpers can be used for. [url]http://forest.no-ip.org/repair/jumpers.gif[/url] <- this is from …
... power supply circuit is probably not providing the +12V and -5V ... . I wouldn't replace these RAM chips until the power circuit ... upper bank. Traditionally these are 64Kx8 chips with half of the RAM ... -4 or -3 is not. You must not connect L and H ...'orange' on a spectrumalways wondered why spectrums could never seem to achieve the colour orange? wasn't one of the default colours, and don't remember seeing anything th…
... whichever screen was paged into upper memory.[/QUOTE]
Yes ... statement to print to the upper memory screen.
... " or "ram disk" however, the command syntax for this is not immediatly ... almost, but as you say not quite.
What ...ZX128/+2 unrainer (HAL10H8)[url]http://velesoft.speccy.cz/zx/umbrella/umbrella.htm[/url]
... is bad I register value detected. If software UNRAINER is ... arrived (hope I have not to pay much tax ... here in Germany it was not possible to get PALs - one ... Omegas DNA demo may not work with the hardware ... look for other reasons like RAM timing?
...WTF is this???[url=http://cgi.ebay.es/Spectrum-128-Emulator-ZX-Interface-2-ROM-Cartridge_W0QQitemZ170254558796QQihZ007QQcategoryZ50223QQrdZ1QQssPageNameZWD2VQQcmdZ…
... doesn't add 80K of RAM et al. merely 128K BASIC ... of ram disc in the upper end of the normal 48K RAM.
not all that many were sold ... could then add the extra RAM - especially as the guy who ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... machine stack in the upper part of RAM. Overwriting that will also ... brief search, I found two RAM-testing programs today written in ... a good speccy RAM-testing util?
If not it probably ... have to relocate parts of RAM (like the system variables), ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... ?[/QUOTE]
It's not something I've done myself ... tests the lower 16K of RAM. (Select (S)OAK test)
The second program tests the upper 32K (both use a machine ... be suitable for testing the RAM of any 48K speccy.Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... absolutely fine - what you've not seen is that it sets ... 's just that it's not selecting a different row or ... they are 1 bit chips, not 8 bit chips. So you ... - look for which bit is not correct, and that's your ... 16K for the 4116 RAM, and the upper 32K for the 4164 ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... going to knock together a RAM test routine today but my ... break and so I'm not going back in until tomorrow ... .2 of [b]16/48K RAM Tester[/b]:-
[strike ... a single wrong bit is detected on a pass, but you ...Jetpac questionHi all, I just bought a copy of Jetpac off of Ebay and I'm having problems. To start, I'm trying to play it on an issue 2 Speccy with Interface 1, 2 …
... of RAM
JR NC,Detected_48K
;16K was detected ... font address
; Does not support wrapping onto next line ... HL
CALL QUICKPRINT ; not end of string, print character ... program is that it does not test the first part ...4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?
The 4116 RAM usually causes it, because it' ... the upper 32K has a fault, sometimes the machine will not use ... as a 16K Spectrum - but not crash. But if the lower ... left of the PCB. The upper 32K is in two rows ...1K Minigame : 3D RacerLast year I started to code a 3D Racer in 1K. The print of the road was however quite flickery so I put it away to pick it up this week again. I deve…
... it 16K/48K only might not be a bad idea.
upper memory for speed.
RAM and alter it on the ...issue 6a faultyHi All I got issue 6a pcb from ebay with status faulty pcb had bad voltages when I power up I changed tr4 ztx650 and all voltages got back on ic6 I h…
... separators). 330 ohm is NOT enough. It needs to ... from the screen to the upper memory. As the Spectrum ... writes certain values to the upper memory. Because the resistors ... data coming from the lower RAM to the ULA. When ... back out of the upper memory. But you'll ...Spectrum+ - multiple issuesHi all Yesterday I picked up a Spectrum+ (via eBay) to add to my collection. Now, before any of the names I recognise from the last few months of l…
... the keyboard membrane). Your upper 32K of RAM is also almost certainly ... program to test the upper 32K of RAM. You may need to ... easiest. Remember Spectrum RAM is one bit wide, not 8 bits wide ...Photos of MODIFIED ZX SpectrumsIf you have ZX Spectrum/clone with any modification(s), please release photos: (or send me your photos to --SPECCY(a)SEZNAM.CZ--, I upload all to my …
Lower 16K RAM (the 'video RAM') replaced with a static RAM:
[URL ... replaced the upper 32K with an SRAM as well (not visible in ... mod is rather straightforward (read: not interesting) - must have been done ...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…
... , as if DOS is active, RAM Page 7 is here instead ... will switch in the correct RAM bank to the top 16K ... just need to specify the RAM bank (0-7) you want ... in the C register (not the B register, as I ... dos routines from the upper bank (as ram page 7 is active ...
