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How far are we from a single-chip 100% ZX Spectrum compatible solution?I really like to read about the projects of some geniusses here on WoS who are working on their ZX Spectrum clones. IMHO some main steps that have b…
... a Spartan-6 FPGA *including* memory for a 48K model. Without ... have to be a few external components. -
Some stupid 16K questions...Starting with... 1. Should a 16K Spectrum that's been upgraded to 48K behave [I]exactly[/I] like a 48K Spectrum? i.e. should the machine test/clear…
Issue 2 and Issue 3 had sockets for RAM upgrade, don't remember now about issue 1.
ZX ROM tests all 48k memory at start-up, so PRINT PEEK 23733 should give 255
for 48k. -
16k --> 48kI bought a zx and found out it was a 16k since when I execute PRINT PEEK 23733 I get 127 Does it mean I get a lesser model? What limitations do I h…
... I do. There are also external expansions, but I don't ... =0&turns=0&memory=1&language=0& ... : you can filter results by memory size. -
16k --> 48kI bought a zx and found out it was a 16k since when I execute PRINT PEEK 23733 I get 127 Does it mean I get a lesser model? What limitations do I h…
Try the memory test program ([URL="http://www. ... />
The easiest way to upgrade a 16K Spectrum to 48K ... -
16k --> 48kI bought a zx and found out it was a 16k since when I execute PRINT PEEK 23733 I get 127 Does it mean I get a lesser model? What limitations do I h…
... , is there any tutorial to upgrade to 48k if needed?[/QUOTE ... into my own memory problems. But due to memory problems of a ... -
16k --> 48kI bought a zx and found out it was a 16k since when I execute PRINT PEEK 23733 I get 127 Does it mean I get a lesser model? What limitations do I h…
[QUOTE=Zorn;671262]Try the memory test program ([URL="http://www. ... />
The easiest way to upgrade a 16K Spectrum to 48K ... -
Has the tower PC it's day?I was watching Click on BBC News the other day and it suggested that due to laptop and tablet sales rising steadily and traditional desktop/tower PC …
... thought I'd really better upgrade that 466 Mhz processor and ... . I sometimes plug in an external mouse if I feel like ... -
Spectrum +2A/+2B: How to tell?Hi all, Sorry if this has been asked before, but I've not found anything that can really help me tell. I've got a black +2, but would love to be ab…
... you own a guide to upgrade a +2A ( I have the ... -1" which was the planned external disk interface for the +2A ... />
*(There is actually an external way to test black +2s ... -
Altera CPLD vs Xylinx FPGAI will dig into the world of FPGA's, mainly to find something that can replace one or more GALs for my current and new projects. And it's never bad t…
... . However, most FPGAs need an external flash chip and have to ... tables can be used as memory (Xilinx calles it "distributed RAM ... example the Spartan 3 (if memory serves) has a 4 input ... -
Can't downloadHi there. I can't seem to download anything from the WOS archive. It seems to time-out or something. I have a fien intenret conection and can down…
... your computer or to some external device?
The computer ... to a USB-connected memory stick or external HD. I always get ... -
Upgrading from 48k to 128kApart from natural progression. What game(s) sold it to you that you HAD to upgrade and nag at your parents countless times after that point to get …
... made use of the extra memory such as Carrier Command and ... , not everyone could afford the upgrade. -
Upgrading from 48k to 128kApart from natural progression. What game(s) sold it to you that you HAD to upgrade and nag at your parents countless times after that point to get …
... liked to see a 128k upgrade for The Great Escape. A ... been made possible with the memory and maybe switch between a ... -
Upgrading from 48k to 128kApart from natural progression. What game(s) sold it to you that you HAD to upgrade and nag at your parents countless times after that point to get …
... school by 1989/90 an upgrade wasn't forthcoming, however much ... MSX for a while - more memory and a better screen mode ... -
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... .
info about divide memory 3Dxx mapping:
- is't ... internal ZX rom and connect external divide rom+ram. Problem can ... -
Another cause for DivIDE problems on 48K'sThe last months some topics were opened to discuss problems with 48K ZX Spectrums and DivIDE. Sofar we found: - Bad Z80's because of poor fanout (si…
... .
info about divide memory 3Dxx mapping:
- is't ... internal ZX rom and connect external divide rom+ram. Problem can ... -
Full disk systems for ZX Spectrum?Hello. Although I don't use much more than TR-DOS, but an acquaintance of mine, a user of Atari XL/XE, always says (which is annoying and irritatin…
... , due to memory allocation etc. (yes you can upgrade to 2mb etc ... (and use ASM) = unlocks the memory :) -
maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …
... to do some processing & memory access on its own. For ... ]
That's how MSX2 memory mappers work. Discrete logic implementations ... internal + 1 or 2 MB external is the biggest you'll ... />
But despite 4 MB. memory mappers existing for decades (and ... -
Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... it will destroy every memory content from the beginning ... code writes to every memory location from 0000 so ... 3, or if some external device puts it into the ... whenever there is a memory access to 0000-3FFF ... each and every ROM memory location, everytime a write ... -
Getting PC into HLHello, here's a conundrum for you... Is there a way to obtain the value of the PC register (say into HL) without using absolute addressing such as C…
... , as it will destroy every memory content from the beginning of ... ]Your code writes to every memory location from 0000 so it ... +2A/+3, or if some external device puts it into the ... -
WIP: ULAPlus hardware implementationThis aims to be an "almost" plug-in replacement for the Sinclair ULA chip fitted in Spectrum 16K/48K/Plus machines. It comes in a form of a small PC…
... RAS signal to cause the external multiplexors to expose one half ... the time from the last memory access before pulling RAS down ... about to start a video memory read. During that time, the ... -
Stash of Spectrum games found in a house clearanceI just acquired this little lot for free. My sister found them and bagged them for me [IMG]http://i23.photobucket.com/albums/b357/mlucifersam/IMAG18…
... one also. memory is shocking, must get an upgrade from 3k (vic20 ... -
Multiface +3 AdviceHi, New to the forum after resurrecting my +3 and looking for a bit of advice on the Multiface 3 please. Quite simply is it worth investing in for…
... />
First of all - purchase external 3.5 inch floppy drive ... switches you can convert your external 3.5" drive into A ... your 3.5" diskette into external 3.5" drive and copy ... be loaded to bottom 16k memory.
128K games ... -
File comparitorI thought Taper might do it but its not quite what I was after. Unless I misunderstood that shows if tapes are identical or not but not the differenc…
... fit into memory. This is the controlling routine; the external GOSUBs refer ... -
Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…
... preemption, relocatable executables, slab allocator memory handling (to reduce fragmentation), decoupling ... kernel implementation (to allow different memory mappings to be used without ... debugging, I've implemented an external debugger which takes a snapshot ... -
Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... TTL, CMOS, EPROM, ROM and memory devices.
The first ... by taking out the upper memory chips and the support chips ... working.
The lower memory can also be the root ... /> Remember to apply all the upgrade modifications as defined per you ... -
Z80 internal compressionThis isn't exactly a ZX Spectrum problem, but since WOS probably has some of the best Z80 coders in the world, I thought I might ask anyway. For my …
... save to any external media (other than dumping the memory to PC ... -
Problems using Save"program" Line 10 in real +2A!!I typed a loader for a program and when I use the typical Save"program" line 10, the Spectrum just gives me "0 ok, 0:1" What can it be???? I dont w…
... you don't have an external disc drive connected to the ... one touched a part of memory stack, or contained machine code ... active or remained in RAM memory, a NEW instruction shouldn't ... -
Problems using Save"program" Line 10 in real +2A!!I typed a loader for a program and when I use the typical Save"program" line 10, the Spectrum just gives me "0 ok, 0:1" What can it be???? I dont w…
... you don't have an external disc drive connected to the ... one touched a part of memory stack, or contained machine code ... active or remained in RAM memory, a NEW instruction shouldn't ... -
Testing a +2I recently picked up a non functioning Spectrum +2 Grey (Issue 3 board?), and am just beginning to go through and see what needs to be done to it. I …
... , detach the powerlines from memory and reattach the chips one ... If machine boots, continue with memory testing
b. If ... capacitors
3. Check memory function
a. Use diagnostic ... 's diag cartridge in an external interface)
So ... -
Cascading transistorsMiguel (mcleod_ideafix) alerted me on an aspect of a design I'm working on where I am cascading transistors, which may give problems. This is the par…
... caused random erasure of flash memory regions inside the microcontroller.[/QUOTE ... use his professional knowledge to upgrade those retro machines.
