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16k Spectrum.How come emulator's in 16k mode don't provide 32 ram-pack support.
... 173537]Isn't emulating a 16k Spectrum a bit pointless? ... since all the 16k software will run on 48K ... have never actually used a 16K Spectrum and have bid ... />
On an emulated 16K,
PRINT PEEK 32768 and ... always set the top of RAM at 16K. -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... voltages required to run the RAM. +/- 5V and +12V. ... test and replace lower RAM. The RAM can be sort of ...
test and replace the upper RAM. Same procedure - remove, socket, replace ... with known good RAM, test removed RAM.
Test ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... voltages required to run the RAM. +/- 5V and +12V. ... test and replace lower RAM. The RAM can be sort of tested ...
test and replace the upper RAM. Same procedure - remove, socket, replace ... with known good RAM, test removed RAM.
Test ... -
toasted soeccysHello, ive jsut bought a pair of speccys on ebay (one 16k issue 2 & a prob 48k issue 3) unfortunaly the genius who sold them tried to see if the wor…
... opportunity. Same goes for the upper RAM block too, the hot air ... available that runs using no RAM. Basically, you just remove the ... ROM. It goes through testing RAM as it goes, displaying on ... -
Features that emulators don't haveI believe most of us use more than one emulator, mainly because there isn't one emulator that has all the features we need or want to use. We also kn…
[QUOTE=obo;177352]Oh, and I want to see faulty upper RAM emulation for the 48K model...
Si[/QUOTE]
How about dodgy power supply emulation whilst we're at it? -
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…
... , 5 problems. Power cirquit, z80, upper ram, tr8/9, lowsy picture quality ... checked out, rom z80, ula, ram everything. When i powered the ... -
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…
... you overclock your processor and RAM you can do the same ... says it's bad upper RAM, but the RAM has not only been ... -
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…
... dodgy - it HAS to be upper RAM or A15
I ... a short routine to test RAM. -
On a 48K issue 6A......how can i isolate the 32K block? I want to test if there is any fault on the 4116's , leaving the 4532's out of the equation. Will removing the …
... for each pin of each ram ic to rom, logic, ula ... also test the tracks of upper ram just in case something was ... interfering with lower ram but still... nothing. No broken ... -
Dead Spectrum +Hi all, I've recently dug out my old Spectrum + with the idea of repairing it. When I last looked at it, when I was much younger, I was soldering a …
... />
I think it's upper ram, any other ideas guys? Am ... -
"Lost" 48K expansionToday I dug up my Speccy after more than 10yrs of inactivity. I bought it as a 16K in 1983, than I had expanded to 48K and never had problem. Until t…
Assuming the upper RAM is working at all ... of eight 4116 RAM chips, and upper memory, from 32768 ... has by testing the RAM, and evidently, on ... first byte of upper RAM) which indicates either upper RAM is not ... 8 chips for upper memory - each RAM chip is attached ... -
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…
... This model has a "common RAM field", like in 128k models ... , there's no contended RAM and there's no Z80 ... it's 64K of RAM, lower 16K are not used and ... They come with 1024MB of RAM and onboard Betadisk (TR-DOS ... #8000, #C000), there are 32 RAM pages and up to 32 ... -
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.
... , so the CPU can access upper memory at the same time ... be quite high if the upper RAM could overpower its outputs through ... -
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.
... be quite high if the upper RAM could overpower its outputs through ... way around, writes to the upper bank were being overpowered by ... -
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.
... 1 threshold is for the upper RAM... if it's TTL levels ... -
Spectrum Diagnosis: Purple is not my colour!Hi, I thought the self-fault-finding amongst you might appreciate my learning experience this afternoon in fixing my home-made speccy 48K. Yesterda…
... all 8 of the lower ram chips with another kind of ... /> I had already removed all upper ram chips (and installed bases) untill ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... daughterboard for replacing the upper memory with static RAM (basically, it'll ... be to remove the bad upper RAM, put chip sockets in, then ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... instead of eight for the upper RAM block. I'd love to ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... instead of 4164 for the upper RAM block in a 48K machine ... use 4464s for both upper and lower RAM. The 4464 is a ... 15) and have quadruple redundancy RAM...
If replacing a ... -
Alternative chips for upper RAM blockDoes anybody know of a way to use 4464 chips instead of 4164 for the upper RAM block in a 48K machine? If not 4464 then something a little more avai…
... 4464s for both upper and lower RAM. The 4464 ... 15) and have quadruple redundancy RAM...
... actually replacing ALL the upper RAM with two 4464 chips ... /> Old Amiga motherboards and RAM expansion cards could be a ... use the extra RAM as a RAM disk of sorts ... -
Paging MemoryAny idea why this short piece of code doesnt work, just crashes. I am just messing with paging memory in and out (not achived this yet) and reading t…
... block of memory exists in ram twice, but PC would still ... just from paging it into upper ram.
Unless there is ... when you page it into upper ram as well. -
Interface rom - Need help to dump itHi, I have temporarily an interface that is similar to a multiface. It has an NMI button and displays a menu where states can be saved and pokes ent…
... ok. Haven't tested the upper ram, as the other machine uses ... of tms. Anyway, without the upper ram the machine wouldn't return ... it were a problem with upper ram, it should.
I ... -
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…
Good news.
I tried searching for the chips on the site but got a bit lost.
Do they do the TMS RAM chips?
I have a faulty TMS4532-15NL4 chip. All my BIT 6's in upper ram are pulled high! -
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…
... /> Do they do the TMS RAM chips?
I have a ... my BIT 6's in upper ram are pulled high![/QUOTE]
Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…
... solid memory tester for testing upper RAM for data bit errors and ...Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…
... solid memory tester for testing upper RAM for data bit errors and ...Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…
... solution (only want to test upper RAM) or a firmware solution (I ...Faulty M1 LineHello, I've got a new DivIDE but it's not working with my Spectrum 48k+. I've got a sneaking suspicion that it's a faulty M1 line. Is there any way …
... can get the 4116 or upper RAM off a Speccy in a ...Faulty M1 LineHello, I've got a new DivIDE but it's not working with my Spectrum 48k+. I've got a sneaking suspicion that it's a faulty M1 line. Is there any way …
... did to remove a faulty upper RAM chip. Only ever done it ...
