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Another Spectrum is brought back to life.Hi Spec-chums. I have been having bit of busy afternoon with repairs today. I've brought back to life a Panasonic Super-VHS recorder, and more intere…
... it could still be a RAM fault.
If you ... , but that there is a lower RAM fault.
Note that ... -
ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…
... and hence NOT accessing the ‘lower’ RAM, the value on the data ... -
ZX Spectrum rescued from a friend, has Issues.Hi guys, I've recovered this ZX spectrum 48K from a friend. It's a 1984 ISSUE 6A. He told me the last time it was turned on was about 30 years ago!.…
... and hence NOT accessing the ‘lower’ RAM, the value on the data ... -
More on the Cheetah RampackI should be more careful about doing "repeats" ( I should learn some manners) but I could not find anything recent on these . But here is on WOS …
... could read enough to see "Lower RAM error at 57FFB " And "32K ... Upper Ram OK" ( I think this means ... is OK) .Then it said "Lower Ram error encountered ". Two of the ... ,IC4 were listed in the lower middle right of screen.
The Different Approaches To Upgrading the ZX Spectrum from 16K to 48K This is probably something that has been covered before . I will take a look to see if I can find anything on WOS
... is also interesting that RAM pack wobble and other ... a common cause of lower RAM failure , I got ... job in showing up lower RAM failure though I cannot ... wobble from the Cheetah RAM pack I got with ... upfront initial RAM upgrade risk 2) ongoing Ram pack wobble ...The Different Approaches To Upgrading the ZX Spectrum from 16K to 48K This is probably something that has been covered before . I will take a look to see if I can find anything on WOS
... ve already brought an upper ram module from Retroleum. The 74LS ... that I repaired with a lower ram module. Only thing I will ... your replacing previously fitted faulty ram, then you have to do ... benefit with a lower current draw with the ram modules though. Other ...The Different Approaches To Upgrading the ZX Spectrum from 16K to 48K This is probably something that has been covered before . I will take a look to see if I can find anything on WOS
... had figured out that replacing lower RAM would be tricky with a ... . So the Ram modlues can replace lower and upper RAM leaving lower RAM in place ...48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…
... 2 between the upper and lower ram. It gave symptoms of a ...48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…
... 2 between the upper and lower ram. It gave symptoms of a ...48K ZX Spectrum 48K Recap (Capacitors) Or Not?I have seen arguments "for an against" on this subject by some "high calibre" experts . So if the experts can differ on this question then my questi…
... are only "slightly damaged" (say lower Ram failture) so this is where ...How can I fix a problematic Retroleum Smart Card. I did not do anything "WRONG " with it but I did but it on a flexible cable and this seems to have "upset" it .Since then It does not perform the …
... this . It said lower RAM was OK . Upper Ram failure at $FFFE .Then ... colour palette test confirms upper RAM error encountered . Suspect IC21. IC ...How can I fix a problematic Retroleum Smart Card. I did not do anything "WRONG " with it but I did but it on a flexible cable and this seems to have "upset" it .Since then It does not perform the …
... 2 that had no Upper Ram at all . I connected up ... top of screen it said "Lower RAM error ar S7FF0 (the last ... said "No upper RAM detected"
The lower part of the ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... surprised this maybe caused the lower ram error but maybe soldering the ...Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... across an Issue 2 (lower Ram only) and managed to ... IC4
And lower RAM ERROR at $7FFB.
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Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... across an Issue 2 (lower Ram only) and managed to ... IC4
And lower RAM ERROR at $7FFB.
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Not bored with the Boards.Going through some old tapes stored rather badly I came across an unlikely item that that I must have stored away quickly with other low grade items …
... . This time ,the lower Rom tested OK so basically ... started , as the lower RAM failure shown with the ... speak with just the upper Ram problem.
RAM and suspect ICs in the lower RAM at ... So something had caused lower RAM failure this time What ...12V missing on an issue 3I’ve been working on an issue 3 Spectrum +. It shows thin distorted vertical stripes on bootup. +5 and -5V are all right but the 12V line measures ro…
... Card menu. I tested the lower ram in a known working motherboard ...If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... the Z80 to refresh the “lower” RAM (the 4116 DRAM chips) is ... write to this area of RAM, it is only freshed by ... documentation being wrong about the RAM banks used on the 128K ...If Sinclair computers had not been sold...I was just having a random thought. If Sinclair Computers (or the rights to them, not sure how it 'worked' back then) had not been sold to Amstrad…
... machine with 80k bytes of RAM (imagine the marketing, more ... dump the 4116 (or equivalent) lower RAM chips. Which is where the ... />
If you retain the lower RAM, and use 64k bit DRAM ... for the upper RAM, you get: 16k (lower RAM) + 64k (upper RAM, some of ...Speccy 4A board problemHi all. I was hoping for some help with my Speccy (with 4A Board) before I send it off for repair. When I power it on all looks fine (i.e. copyright …
... it does not have enough RAM to run :-(
... could be a RAM fault, most likely the ‘lower’ RAM (4116 or equivalent ... corrupted due to faulty ‘upper’ RAM.
The quickest and ... try to eliminate the ‘upper’ RAM, you could disable it. Then ...doubt about swapping ULA in an issue 2 boardIs it possible to swap a 6C001E-6 ULA type with a 5C112E ? I have this issue 2 board that is not booting, it shows me a black border with horizont…
... DiagROM gives me lower RAM errors, it says all lower RAM is faulty, or ... at the 7805.
RAM IC's are MM5290N
I replaced just one RAM with a modded 4164 ( i ... still shows me an entire lower RAM failure.
I'm ...Direct drive LCD screen - looking for information on previous projects people may have attempted.Hi All, My first post, so please forgive and guide if I've posted in the incorrect section. I'm a speccy user from way back in the 80's, but m…
... the Z80 writes to the ‘lower’ RAM area to generate it’s ...Were the full Sinclair Loki specs ever actually known?I was just curious. A lot was leaked to the media, but the exact specs seem different depending on source. Some say it could support up to 512x256 an…
... refresh of the 16K byte ‘lower’ RAM did not work as intended ... obviously worked, even if this RAM was only being refreshed by ... and the Z80 accessing the RAM, they did not try to ...Anybody got a parts list for an Issue 3b please?I've got a schematic, but does anyone have a parts list with the values just for the resistors and capacitors? Just would save me sometime going thro…
... you use a lower ram board or mod 4164 ram you could do ...what soldering / disordering equipment do you usemy experience with zx spectrum / amstrad cpc boards 1.cheap solder braid (not good) need to try some better, any recommendations when i looked i go…
... small door ..its removing them lower ram chips that i have to ...Are 128K games more likely to crash than 48K ones?Hey, guys. I've been doing some experimenting with various games and even some music demos and apps, and I'm beginning to reach a conclusion that …
... switches ROM and/or RAM banks into/out of ... . But the 16K of ‘lower’ RAM still comes from one set ... 32K of ‘upper’/‘expansion’ RAM still comes from the other ... set of 64K byte RAM chips.
... to load in a diagnostic/RAM test program.
Max RAM for ZX Spectrum gamesHow much RAM can be used for single level/whole game? On tape writing.
... between contended and uncontended RAM is a hardware thing.
RAM there is. This RAM is often known as the ‘lower’ RAM.
RAM. This ‘upper’ RAM is uncontended. The Z80A ... /> In the 128K models, the ‘lower’ 16K which has the screen ...
