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Opus Discovery "the big switch on" (after 20 years)I have a few of these Opus Discovery's with different Eproms in that have not been swiched for 15-20 years or so . I am in no rush to switch any on …
... programmer. The programmer can then read the data and copy it ... the ROM is in to read and copy the data. As ... read each memory location that maps to the ROM (so the first 16k ... -
NTSC Compatibility?Correct me if I'm wrong, but wasn't the Timex 2068 the only NTSC clone built of the ZX Spectrum? And I use clone lightly... From what I underst…
... writes. It has to read the video memory (pixels/colors) for the ... to contend at least a 16K bank and that 8K would ... decides to read/write from video memory (or any memory in the 16K lower ... guess I need to re-read the memory contention chapter a dozen ... -
Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…
... for errors in individual bits / memory locations.
So basically ... ;51916"]On saying that I read that the power rails have ... . Better: use 4164's, try 16K*4 or 64K*4 DRAMs ... -
Testing 4116 type DRAMsHappy New year All! I'm managed to find some time to repair some more Spectrums :) woo hoo. I have a couple with busted lower RAM, Sooo, I appr…
... in order to read or write to the memory matrix contained within ... the expansion/edge-connector. A 16k Spectrum would be more suitable ... 4116 DRAM to the upper memory area. Whatever way you go ... -
Question of contentionI'm not desperate to go digging through technical descriptions in depth, but one thing bugs me about the Speccy's video contention model - and that's…
... normal memory cycles). By using page mode, the ULA can read two ... bytes for every memory access.
16k byte DRAM chips) of the ... normal memory access :-)
Also, the CPU has to read an ... -
128K programmingDoes anyone know any good resources on assembly programming for the 128? All I'm after is an "idiot's-getting-started-guide" on how to utilise the…
... 64k of memory, these are divided into four 16k blocks.
16k block can have either the ... can set the ULA to read the screen from bank ... ways to use the extra memory:
1. Back ... executing code in the top 16k bank and you switch ... -
128K programmingDoes anyone know any good resources on assembly programming for the 128? All I'm after is an "idiot's-getting-started-guide" on how to utilise the…
... 7) at the top of memory to write to it, at ... 't page it in to memory at the usual screen address ... memory and write to the screen at address 49152, then immediately read ... the same data back from address 16384, as the same 16K ... -
128K programmingDoes anyone know any good resources on assembly programming for the 128? All I'm after is an "idiot's-getting-started-guide" on how to utilise the…
... memory and write to the screen at address 49152, then immediately read ... the same data back from address 16384, as the same 16K ... -
ZX Dandanator! Mini - Cartridge system for SpectrumsHi All, I'd like to present a little HW I've developed during the last three months. It's aimed at providing a console-like usage experience for a…
... all of the storage space (read only!) from your own programs ... controller that would page-in 16k slots in the rom space ... from a 256byte non volatile memory, changing boot options or changing ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... 8k to 16k?
When paging memory on an instruction read, the ... in of the Disciple's memory (RAM or ROM) takes all ... from the currently paged in memory (the Spectrum's ROM). The ... -
Where does the BASIC program sit 48K Spectrum memory?Hi there First post so be gentle, I've had a spectrum since the 80's and have recently started programming it for fun again. I wrote the followin…
... and writes to the first 16K of RAM must contend ... you can only read or write that memory for two out of ... your machine code in higher memory on a 48K machine ... has to write to screen memory, it will be slowed ... is, and how much memory it needs for variables to ... -
ZX Dandanator! Mini - Cartridge system for SpectrumsHi All, I'd like to present a little HW I've developed during the last three months. It's aimed at providing a console-like usage experience for a…
... explaining is, when you read from non-volatile memory, where the number ... don't split between 16K slots (must be 16K or smaller)
16K ROM slot.
4. Force ... -
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 …
... ..Was the Fox "conversion PCB" (memory module) fitted to Spectrums prior ... /> 2) 16K Spectrum upgraded in factory by addition of Memory module.and ... />
Can an EPROM programmer read a 6116 RAM chip ? . I ... an EPROM but could it read it anyway? -
Disabling the ROM without removing the whole thingHi! I've got my hands on a non-working issue 6a. I suspect the ROM may be bad, but other things may be faulty as well. I've read that in an otherwis…
... high. The Z80 CPU will read this as RST 0x38 (op ... again. The result being that memory fills up (and wraps around ... is repeatedly stored in every memory location.
As the ... to write to the lower 16k of RAM.
Is ... -
Another 48k Speccy acting as a 16K model.Hi all, I originally was going to post asking for help to fix the new addition to my family a very nice condition Issue 2 sold on ebay as a 16K model…
... whole 64k bytes of memory (16k bytes ROM, 16k bytes RAM, optional 32k ... CPU is attempting to read non-existent memory, the value may be ... ULA read from the screen memory.
By no working memory, I ... -
Interupt service routinehas anyone set up a interupt service routing with pasmo? this one I tried resets the speccy EDIt- I placed the code after the END directive, I fi…
... and 49151, since the lower 16K of RAM has access speed ... issues and the upper 16K of RAM is paged in ... probably write your own keyboard read routine).
Finally, remember ... gaps and patches around your memory, but if you're really ... -
Spectrum Next in the ArchiveWhen the Spectrum Next is launched, should it be added to the archive, and games archived as per usual WoS usage? There are a lot of new games annou…
... a program that works on 16k speccy but not on a ... if there's more than 16k mem and fail)[/quote]
memory locations. The RAM in the ... programmer may written programs that read the data from the non ... -
Reading Disks via ASMI'm hoping to port my Amstrad game to the spectrum (See the link in my sig for info) I will be targeting the 128 and +3 - the game will not work on …
All disk read ops are done through one ... version had to page in 16k of extra code into the ... loading (it was always in memory on 128k) - but this will ... -
hacking controls for atic atac?I was wondering if there is any way to hack in game controls? In particular for Atic Atac. I prefer to use keyboard controls for most games, but the …
... new routine somewhere else to read whatever rows required and return ... is likely easier with a 16K game as long as you ... 't mind it not being 16K only then you can simply ... new key routine into upper memory anywhere I guess... -
Why can't you make a BASIC program as big as you want?Let me rephrase that. Is it possible using BASIC to write a program that can be multi part? In other words one that can LOAD lets say a story, in se…
... txt adventure on yr 16k zx, just have a ... main program A, saving memory for another part and ... memory.
- Using upper memory to store the levels and read ... you can release the memory used by a program ... it will need some more memory to doing the "merging ... -
Better keyboard = better sales ?Just a random thought. I want to start this by saying although I did not have a + model new, I was never really a fan of this keyboard as it was n…
... the CPU wants to read a byte from main RAM ... from RAM, the first read gets four of the required ... bits, the second read gets the remaking four bits ... even worse than on a 16k ZX Spectrum.
memory (such as ROM).
... -
Bit of fun - one change onlyI also posted this on another marque's forum (for their products) to see. Its just a bit of fun really. OK, if you could of made one change to a S…
... display data can be read ahead of when it ... br />
Remapping memory, be it RAM or ROM ... easily override the ULA memory control logic. So either ... banks. Say the top 16k of memory.
Indeed ... ZX Spectrum+. As DRAM memory prices were falling, a ... -
New Utility to Transfer Z80 Snapshot to +3 DiskSince getting a Gotek for my +3 it has been my go to machine. The biggest downside however is the lack of older games on disk format with pretty much…
... to 32766. This is then read by the loader code to ... -
Useful Hacks and Alterations ArchiveBeyond infinite lives and 'cracked' games (which I don't like much) there are several really useful hacks of Spectrum games that make them - more pl…
I wonder if some of the games where the controls were 12345 were not always thought of as for joysticks, but merely as you can read one half row perhaps, saving precious memory. More a case with 16K games, perhaps where you use another half-row aka QWERT -
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... machine code - fill up the memory with about 700-and-something ... the Blue as it required 16K of memory. When I came up ... the ZX80 (anything up to 16K) which uses all eight of ... did. And in order to read the hex output from my ... -
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…
... did was just get the memory contention circuitry to override the ... the intended refresh of the 16K byte ‘lower’ RAM did not ... line. This is a hardware (read ULA) fault. The work around ... -
More "What could have been"... The Z280.So in chasing up the Loki specs, I happened upon some parallel developments... And had Sinclair gotten to make the Loki, there could have been some i…
... a normal i/o read cycle to read the keyboard state. ...
* You mentioned full ram memory mapping. Some important spectrum devices ... in its own memory in the bottom 16K using the expansion ... Spectrum Next, memory accesses in the bottom 16K are also hidden ...
