Questions tagged [zx-spectrum]
For questions about the different versions and products of the Sinclair ZX Spectrum computer
144
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Using Sinclair ZX Microdrive is it possible to random access a text-file?
I wish to build a small database using Sinclair ZX Microdrive: one can think to create a text file using some simple BASIC. For simplicity let's say the record is 512 bytes in length, i.e. the same as ...
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ZX Spectrum+ 48K with faulty memory writing address
I have ZX Spectrum+ 48k (board issue 6a) with writing to memory issue.
When I try to write a value by POKE command to address 49152 (C000h) then it overwrites additionally value with address 16384 (...
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What are the electrical properties of the EAR and MIC sockets on a ZX Spectrum, and can they be connected between machines?
I'm interested in the possibility of connecting two ZX Spectrum computers together using as simple an interface as possible.
The ZX Spectrum has two mono audio sockets at the back labelled EAR and MIC....
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How did "Super Wonder Boy (in Monsterland)" defeat the Multiface One?
The Multiface One was a memory dumper for the ZX Spectrum 48K with a button that generated an NMI to run code in its ROM that could dump the machine state to mass storage (CMT/cassette tape, diskette, ...
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How did ZX Spectrum games loaders prevent the use of MERGE?
The MERGE command could be used on early games to load the first BASIC program block without it auto-running, but in later games, the use of MERGE caused the machine to hang. How was this achieved?
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ZX Spectrum - guidelines for porting to PC and more are appreciated
I want to make a surprise for my father.
Back in the 80s my father made a game for a custom clone (called Santaka) of the ZX Spectrum. I have all the digital files needed for it to work, but I'm ...
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ZX Spectrum interrupt handling: maskable and NMI
Is there a skeleton for handling the interrupt on the ZX Spectrum? Can I read it?
I need the ZX Spectrum to handle an interrupt from a device and I have no idea where to start from.
I like the idea of ...
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BASIC line input buffer location on ZX Spectrum
I'm currently writing a ZX Spectrum emulator (I know there are plenty, but it's a project).
I'm having an issue where it keeps repeating the last key press even though I know the port lines have been ...
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Was the ZX Spectrum used for serious number crunching?
From Eurogamer’s obituary of Sir Clive Sinclair:
Sinclair never intended for his computers to be games machines, but
that was what the market decided they were. Within the space of a few
years, the ...
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How do I use the extra commands in the Spanish version of the 128k Spectrum ROM?
The Spanish Inves/Investronica version of the 128k Sinclair Spectrum had a rather different ROM from the English 128k Speccy.
Error messages were in Spanish, there were extra letters and punctuation ...
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How are the extra BASIC keywords of the Timex Sinclair 2068 that the ZX Spectrum didn't have encoded?
I've read that the BASIC of the Timex Sinclair 2068 is a superset of the BASIC of the Sinclair ZX Spectrum with a few extra keywords.
The extra keywords are: DELETE delete BASIC program lines,
FREE ...
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What is the size of the border of the ZX Spectrum in scanlines/pixels/bytes?
The bitmap area of the Sinclair ZX Spectrum is exactly 256 x 192 pixels.
Surrounding the bitmap is quite a wide border area which is generally just one colour but loading and saving from tape changes ...
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Does the .sna snapshot file format for Sinclair ZX Spectrum emulators support a 16k variant
I'm playing with emulator and file format programming again.
One of the common game snapshot formats for the Sinclair ZX Spectrum is the .sna format.
I know it comes in a 48k format and a newer 128k ...
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What was Sinclair's intention with the Microdrive?
The ZX Spectrum was announced with support for both standard cassette tapes and Sinclair's new Microdrive format -- although the latter wasn't released for another 17 months.
Given that the necessary ...
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Spectrum 128K +2 Power Supply Buzzing and over voltage
I've seen a similar question to asked here but but I'm not sure it fully addresses the issue I'm having. I'm using a PSU the same as this one from the 128K +2
According to this site, this PSU ...
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Is there a version of Python that runs on a QL, Speccy or a Commodore?
Does any Python port run on any Speccies or Commodores? I am hopeful about QL, since:
Based on a Motorola 68008 processor clocked at 7.5 MHz, the QL
included 128 KB of RAM, which was officially ...
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How did the various Soviet ZX Spectrum clones support Cyrillic text?
There may be no one single answer to this question, since the various clones might have done this all in different ways. And of course, some clones do not have the Cyrillic text support at all. I'm ...
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Did John Carmack really invent "Adaptive Tile Refresh"?
John Carmack is credited with making fast-paced arcade games like Commander Keen possible on an IBM-PC that had no specialized graphics controllers suited for those, thanks to the "Adaptive Tile ...
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Why was Carrier Command for the ZX Spectrum superior to the C64 version?
The ZX Spectrum version of Carrier Command has 3D rendering, while the Commodore 64 version, despite a greater amount of RAM, was inferior in comparison. You open the in-game map and there's Google ...
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Is I/O port 0xFE reserved on the eZ80?
TL;DR
Following on from OmarL's comment, to the closed question, Why did the Spectrum Next choose Z80 on FPGA?:
But also, the eZ80 is not compatible with the ZX Spectrum because it uses port FE for ...
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ZX Spectrum coordinates to bitmap conversion subroutine acting strange
I originally posted this question on stackoverflow, but I wrote a little program that converts coordinates stored in the b and c registers of the z80 into their corresponding memory address for the ZX ...
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Compression techniques used in old ZX Spectrum tapes
Many ZX Spectrum games* (and demos) would improve loading time and save space in the tape using rudimentary compression. During decompression, the game would display "decrunching" for ...
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Is there a list of space-saving techniques for representing constants?
Since numbers in ZX BASIC are always floating point and take up 5 bytes, it's often possible to save space when representing integers by using several tokens, which take up 1 byte each.
I know of COS ...
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Where can I find a copy of the HiSoft C compiler manual for ZX Spectrum?
I've been able to find the manual for the CPC version of HiSoft C, but not for the ZX. The only ones I could find appeared to have been OCRed, so virtually all of the necessary information was lost.
...
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How to save and load CSpect emulator state when emulating ZX Spectrum Next [closed]
I use CSpect emulator for playing a game for ZX Spectrum Next. I wonder whether is possible to save the emulator state to memory and load it in the future in order to have game save/load functionality ...
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Did any ZX Spectrum clones use a 16 bit datapath between memory and video generation?
On the Commodore 64, there is a 12 bit datapath between memory and the VIC II: the ordinary screen data, which is in DRAM, and another 4 bits which comes from another SRAM chip which may be paged into ...
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Reading data of floppies from a ZX Spectrum Swift Disc
Back in the day when we had a Sixword Ltd. Swift Disc floppy-drive we were ahead of the game on our speccy, allowing us to use 3.5inch floppy disks. See:
https://www.worthpoint.com/worthopedia/swift-...
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What are quick ways to load downloaded tape images onto an unmodified 8-bit computer?
There are repositories of tape software available online, for example CPC Power for Amstrad CPC machines.
What is the fastest and simplest way to load such games onto an unmodified computer, with the ...
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ZX Spectrum fuse-emulator - how to use loader/multi-file program?
I'm using fuse-emulator on Ubuntu. In a book of type-in programs, some are spread across multiple files. There is a "loader" (usually setting up graphics or some machine code parts) which ...
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Why did the Vic-20 need special chips for I/O?
The Vic-20 used two 6522 VIA chips for I/O. I asked why it had two of them but thanks to a comment from Bruce Abbott, I now think that wasn't quite the question I needed to ask.
What I really need to ...
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What non-Spectrum computers did Sinclair sell 4 million of?
Reading Alan Sugar : The Amstrad Story, I just came across one of those little oddities that initially manifest as 'huh, wait a minute' and sometimes just mean someone has made a typo, and sometimes ...
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ZX Spectrum 48k Power Supply outputting 15V
I got a working ZX Spectrum 48k (issue 6a) with the original power supply.
Before hooking up the power supply I tested with my multimeter to see if it was good. The power supply specifies it outputs ...
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Where can I donate Old Mags and Media in bulk in UK?
I am taking advantage of lockdown(s) and scanning/imaging all old media to archive.org, but would like to donate the boxes when finished.
A bit like Donating old Computer Shopper Magazines
The Centre ...
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How did the ZX Spectrum avoid key ghosting?
Was the ZX Spectrum better at handling than later PCs-keyboards without having diodes in its key matrix? I encountered this comment on Y Combinator but I fail to understand it.
Couldn't the Speccy ...
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Back in 1984 I wrote some games for Spectrum - Will they still be playable?
Back in 1984, I was commissioned to write some games for ZX-Spectrum. They were sold together. To my amazement I found that someone is selling a copy online.
I thought of buying it but it is in the ...
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ZX Spectrum red stripes during loading
When we load any game on ZX Spectrum from cassette player...
Should red stripes move smoothly for better result or they should be static for perfect result?
What is the theory?
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Could Pac-Man be replicated perfectly on the ZX Spectrum?
We all know that various ports of Pac-Man exist but my question is just for one specific computer. Could the Spectrum, with time and proper knowledge, run the Arcade version of Pac-Man despite it's ...
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Was the Ram Turbo the only 3rd party Interface 2 ROM cartridge interface for the ZX Spectrum or were there others?
One of the original Sinclair peripherals for the ZX Spectrum was the Interface 2 which provided joystick ports and also a slot for ROM cartridges:
The cartridges did not catch on though and only ...
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Using Bresenham's circle algorithm (or another alternative algorithm) to draw an arc [closed]
I'm trying to create some graphics function for a ZX Spectrum (Z80) machine in assembler. I already have the basics except for the arc.
I know that there must be some way to draw an arc using the ...
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Are all 64k x 4-bit ICs interchangeable for Amstrad-era ZX Spectrum 128k +2/+3?
There were 4 64k x 4-bit Integrated Circuit chips in the Amstrad-era Sinclair ZX Spectrum +2 and +3 models. These are known as the +2A, +2B (both +2 "black"), +3 and +3B (also both black cases).
I ...
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Why did the Spectrum Next choose Z80 on FPGA? [closed]
I'm curious to understand why the Spectrum Next uses Z80 on an FPGA instead of something like at eZ80? I would have imagined they would choose the eZ80 since it is still a production part. Anyone ...
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Where can this "boot.B" file be coming from on this Spectrum TR-DOS disk image?
After working on some tools that parse the TR-DOS disk image format .TRD files for a while I just noticed that one of the game disk images I had downloaded "La Abadia Del Crimen", only has three files ...
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Does Sinclair Spectrum BASIC have a maximum length for one line?
I was just writing some junk Speccy Basic programs, more to see how they take up space on the +3's disk layout than to do any actual programming.
But I noticed that after editing a program line to ...
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What role does the 4-bit shift register play in the Leningrad video generation?
The Leningrad contains a shift register1, which I believe is loaded with data from the bitmap. This part loads 8 bits in parallel, and shifts each bit out in turn on the rising edge of a clock signal. ...
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Did the Samsung SPC-650 have any hardware or firmware differences to the genuine Sinclair Spectrum+?
There was a clone of the Sinclair Spectrum+ in South Korea called the Samsung SPC-650 that looks identical to original British version with just an extra model number/logo. It even retains the ...
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Is there a Spectrum +3 ROM disassembly available with the addresses of the instructions included?
In my experiments with Spectrum disk formats I've found myself looking into the ROM code a few times. Several Spectrum emulators have built-in debuggers that let me dissassemble and step through the ...
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How do I know where the file directory is stored on a Spectrum +3 disk layout?
I'm trying to parse Spectrum +3 disk images. I only ever had a tape-based Speccy back in the day.
The +3 had a built-in floppy drive but was late to the party and not that successful. It had the same ...
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How does the Spectrum +3 know whether a disk is bootable or not?
I've been looking through documentation on The Sinclair/Amstrad Spectrum +3 which was the only Spectrum that came with a built-in floppy disk drive. The disk format was based on The Amstrad CPC and ...
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How does DRAM refresh work in the Leningrad?
The Leningrad uses the КР565РУ5 chip, which is the same as a 4164. It contains 64kbits of DRAM, and the datasheet says that each of the 256 row addressed need to be strobed every 4ms.
I can see how ...
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Details of ZS Scorpion port 0x1ffd
There's this page about the ZS Scorpion, and I'm reading about the way bankswitching works. Port 0x7ffd is the same as on western ZX Spectrums, but to double the amount of RAM to 256k and also the ...
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