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48K: Half of copyright message in the middle of the screen?!Issue two. Has 74LS08 over the Z80, but the ULA is 5C112E-3 (I think this should be a 5C102E??? - I have one, but I'm not sure if it is working, at l…
... 'm quite sure that the lower memory chips are ok.
All ... ) working ULA, CPU, ROM and lower memory.
Two wires of ... -
New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…
... and the voltages at the lower memory when turned on are -4 ... -
displaying all memory activity in a screenDunno why I keep thinking about this, but here goes Is it easy enough to add a screen to an emulator that shows every memory address' activity.... …
... an emulator that shows every memory address' activity....
Im ... the activity on the dispkay memory?
Does all that ... of every bit in speccy memory
Thst leaves plenty of ... -
Hooky - hook ZX ROM and rewire RST and NMI to RAM - rantThis is a rather long rant. Not for short tempered. :) The objective is to hook into RST "vectors" and NMI on a Spectrum without affecting the normal…
... overwriten. Bummer. What if we replace RAM checking
code with ...
; ... loop code sets every memory location to 2.
uploop ... : so one way is to replace code between 0x11D4 and 0x11EF ...
somewhere in ROM /after memory check/ and rewire it to ... -
New from Paul Farrow, the ZXC4This is exciting stuff!!!! Sorry if ive stepped on your toes Paul, wanted people to hear about it!!! [QUOTE]Hi I?m happy to announce the release o…
... but it also allows full 16K ROM programs to be used ... character set bitmaps down in memory (hence improving program compatibility).
16K/48K Spectrum) which has a ... -
Spectrum rubber key memory upgradeIf a 16k spectrum has a 32k fox upgrade kit installed anyone any idea what board revision we would be expecting to find in this machine? And was this…
If a 16k spectrum has a 32k fox upgrade kit installed anyone any idea what board revision we would be expecting to find in this machine? And was this an after market kit or one offered by sinclair?:grin: FANX -
16k box question.Did some of the 16k versions come in polly inserts in a plain brown box like the one ive just picked up or is it just a case of the black box with th…
Did some of the 16k versions come in polly inserts ... few issue 1 and 2 16k spectrums especialy on ebarf lately ... -
Slow/fast games - change speedSome ZX games are too slow or too fast. Problem with speed is aslo in russian ZX games or thanks to different memory layout on zx128 and +2a models. …
... games or thanks to different memory layout on zx128 and +2a ... slow. One POKE 43315,0 replace HALT instruction with NOP and ... -
Great to be back....and with fun to comeHi all, 1982: I bought a new 16k issue 2 in 1982, eventually got microdrives and a dktronics keyboard (version 1). Built a home made eprom programme…
... :
I bought a new 16k issue 2 in 1982, eventually ... will be the original IC). Memory etc will be single chip ... -
ZX81 + 16k RAM Pack + Original PSU... What's it worth?Hey guys Got my ZX81 this morning its in excellent condition.. [IMG]http://s30.postimg.org/iwetzxku9/IMG_20140818_142443.jpg[/IMG] However, my T…
... ZX81 with original PSU & 16k RAM pack actually worth here ... -
For Sale?? Offers? Spectrum ZX81, PSU & 16k RAMHi all I've got a ZX81, 16k RAM pack & original PSU here I purchased sadly it won't work with my TV and I don't want to hack it apart to make compos…
... /> I've got a ZX81, 16k RAM pack & original PSU ... -
Next step for fixing my speccy?Hi guys, I've picked up my faulty Spectrum aiming to fix it. So I followed the excellent JouledperCoulomb videos on Youtube for the basics and I am …
... been a reason for failing memory and it does not ... am afraid whatever killed the memory will also destroy newly ... installed memory?
Are there ... / should check before replacing the lower memory?
Thanks,< ... -
Wanted: ZX81 boxed with 16k RAM PackI'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D …
I'm looking for a clean, working and good condition ZX81 with original Sinclair 16K RAM Pack. Would prefer if it was in a box. Oh and if you have 3D Monster Maze that would be the icing on the cake, thanks. -
ZX81 ULA questionRecently, I got a nice bundle of kit comprising of a ZX81, Memotech keyboard, PSU and brand new 16K Sinclair Memory pack. The ZX81 has a ULA with no…
... keyboard, PSU and brand new 16K Sinclair Memory pack.
The ... -
ZX-Assembler file handling concept[QUOTE=clausjahn;777075]Dear readers, At this time, it's a good time to ask you, the future users, how to implement the file usage. Let's suggest so…
... well as RAMTOP address, the memory data can be split-down ... a shorter compiled result could replace the datablock value easily.
Better arrangement for video memory?While doing some documentation work for the ZX-Uno project, I compared the advantages of the weird layout of the ZX Spectrum against a linear layout.…
... of character in video memory
ld b ... Y0
Memory address (ZX Spectrum arrangement)
Memory address (C64 arrangement)
... byte of the display memory address, we increment ... high byte of the video memory address)
16k to 48K upgradeHi everyone I was just wondering if anybody knows if it is possible to upgrade a 16k Speccy to a 48k with the required RAM chips. If this is possibl…
Hi everyone
I was just wondering if anybody knows if it is possible to upgrade a 16k Speccy to a 48k with the required RAM chips. If this is possible where would i get them from.
thanks a lot
BenammiPictures of 48k ZX Spectrums Showing the Important Voltages[SIZE=6][B]Pictures of 48k ZX Spectrums Showing the Important Voltages[/B][/SIZE] [URL="https://farm4.staticflickr.com/3841/15005543009_7bcf3b3031_o…
... /> [*]The +12V (for the "lower" 4116 16k RAM chips, bottom left of ...Android memory questionErm, I was sure there was already a thread about this before but I couldn't find it, perhaps it's deleted or something. So I'm asking this again. I …
... ), but it fills up its memory pretty fast (and gets real ... the SD card help reduce memory usage?
Thanks in ...Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …
... the diags were reporting both lower and upper RAM were healthy ... .
Now suspecting a lower RAM issue, I entered and ... some lengths to ensure that memory is well exercised.
Noob repairs of an S2 and S6AI received two Spectrums a Series 2 and a Series 6A both of which are not working. I don't know anything about electronics so thought my lad and I wo…
... this :)
For the 16K S2:
I've not ... something to do with a memory upgrade, it appears to actually ..."Zombi Terror" for ZX81 16kHi everybody! Our last game "Zombi Terror" is now available on Sinclair ZX81. The port was coded by our friend Paulo Silva (Nitrofurano) and myself …
... /> The game only works on 16k expanded computers.
As ...Keyboard for ZX Spectrum 16k/48k or HarlequinThere is a keyboard developed originally for use with the Harlequin but maybe used as well with any 16k/48k ZX Spectrum. The keyboards offer a great …
... used as well with any 16k/48k ZX Spectrum. The keyboards ...Air Traffic Control RomeLuca has taken an old game he wrote in basic back in 1987 and with a bit of help from me and Einar he's managed to get it into 16k. [IMG]http://www.…
... managed to get it into 16k.
[IMG]http://www ... /> A BASIC program for the 16K/48K/128K Sinclair ZX Spectrum ... Italy, stored inside the Spectrum memory, which displays some districts beacons ...Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... such problems, the paged in memory behaves itself as it should ...Smokin... more 48k woesHi, it looks like I've converted another Spectrum 48K+ into a smoke machine. I'd been rebuilding an Opus Discovery unit and everything looked good. …
... a diagnostic ROM and the memory is all OK, as is ... ver.4S motherboard with Zorns lower RAM module and a composite ...Issue with Issue Two[img]https://dl.dropboxusercontent.com/u/25300140/Spectrum/Edited_ImageEasyImageEditor_20141111_84.jpg[/img] I'm working on an Issue Two that was sh…
... border. I changed the upper memory and the result is as ... .
Is it the lower memory then?48K Upper memory issues?Having more issues with the 48K spectrum I just fixed that had the black screen in this thread [URL="http://www.worldofspectrum.org/forums/showthread…
... end.
Ran the memory test
PRINT PEEK 23732 ...AGD memoryHow low has anyone got AGD memory showing but still works without crashing or errors. My Monty game is showing 30 and will not allow you to open any…
How low has anyone got AGD memory showing but still works without crashing or errors.
My Monty game is showing 30 and will not allow you to open any events to edit. If I add just one letter to any text it crashes big time, full reset.PANDEMIC - New game for 16K ZX81Just in case any of you sometimes tend towards the earlier flat-keyed friend, a top-down shooter for a standard 16K ZX81 - think Gauntlet with Microb…
... -down shooter for a standard 16K ZX81 - think Gauntlet with Microbes ...
