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Hacking the ZX Spectrum 48K ROMHi Guys, I have modded my Speccy with a dual boot ROM loading on first bank the original ZX kernel and on the second bank an enhanced version. I h…
... each memory address of the rom is filled with HEX ... https://skoolkid.github.io/rom/index.html"]ROM disassembly[/url], particularly as ... any games that use the ROM as data.
... colour:
[code]
0 = BLACK
1 = BLUE
2 ... -
What clone for the USA?Living in America, so fellow ex-pats might be able to answer this. Yes, I know I can do a search but why not ask first as knowledge beats enquiries. …
... a cartridge which includes a ROM that has the contents of ... the ZX Spectrum ROM. Or buy an actual ZX ... dark grey version, NOT the black +2 (+2A, +2B), a locally ... -
Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... determine machine type in my ROM checksum utility.
First ... the 128/+2 and the Black +2/+3.
As ... in the paged RAM their ROM should remain paged out and ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... ) on my +2B (issue 4, ROM 4.1) - and I tried ... +2A (ROM 4.0), +2B (ROM 4.1) and +3 (ROM 4.0 ... game, or are owners of black Amstrad-model Spectrums doomed to ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... ) on my +2B (issue 4, ROM 4.1) - and I tried ... +2A (ROM 4.0), +2B (ROM 4.1) and +3 (ROM 4.0 ... game, or are owners of black Amstrad-model Spectrums doomed to ... -
48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... between the Z80 and the ROM and/or ULA. Swapping the ... not processing instructions from the ROM. Either there is an address ... ), or either the CPU or ROM are defective.
[quote ... to initialise, other times a black border.[/quote]Assuming that they ... -
Fast Binary to Text DisplayI've done this thing that takes some memory contents and converts it to a Binary version of 0's and 1's on screen. However, I've no idea what to use …
Green ink on Black paper is better, and a ... just do data from the ROM thats the only problem, and ... -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... my +2B (issue 4, ROM 4.1) - and I tried ... 2A (ROM 4.0), +2B (ROM 4.1) and +3 (ROM 4. ... or are owners of black Amstrad-model Spectrums doomed to ... 4 board as above, ROM 4.1), and an emulated ... +2A/B (ROM 4.0/4.1) and ... +3 (ROM 4.0).[/quote]
... -
Best Mid Price , General use , Soldering Iron for work on Spectrums I bought one recently for a fiver but it was not really as good as my 1990s ones (which are past their best now) Does anyone know of a good mid…
... ago by pressing a dual ROM socket into the socket and ... for the Hakko Station 900M Black .So a different brand but ... -
Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... bitmap area of screen goes black, while the reset line is ... will go black when you let go, as the ROM code goes ... -
Opus Discovery not WorkingHello hope you can help, or if this thread goes well that you also find the answers you are looking for... I have an Opus discovery that does not …
... and when i updatrd the rom it stsrted working and then ... refitted original rom and still worked but now ... ground? Would I connect the black probe of my voltmeter here ... -
Testing an Interface 1As title, is there an easy way on how can I test to see if its functional or not please ? :) Please bear in mind I do not have *any* microdrives n…
... ;943593"]The interface 1 ROM will be activated when any ... the network) then the ROM will change the memory map ... test the ULA and the ROM.
[b][i ... 2A, +2B (both in a black case and using a PSU ... any of the Amstrad based 'Black' machines (+2A/+2B and ... -
Features that never made it into the SpectrumAlthough kind of a Hardware question (a kind moderator might want to move it, I was 50/50 on where to post it, I don't mind) , I was thinking about t…
... a ZX80, but the ZX80 ROM did not have any built ... at that point, revealing the black print.
The Alphacom ... -
Which to buy? +2/+2a/+3?Sorry - I did a quick bit of lunchtime googling, it sounds like the grey +2 is the best machine, as it has the board without the reduced chipset. I …
... may do this to my black +2 at some point, its ... ]EDIT...[/b] Maybe the +3e ROM set in a +2A/+2B ... -
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 starting up to a black border and white screen? ... a built-in diagnostics rom that can still be ... IC's. The diagnostic rom will identify which IC is ... a white border with a black paper area, then that ... But the other way round, black border, white paper would need ... -
Can someone run this test program on a real Spectrum 48K?I've knocked up a small test program just to satisfy my emulation OCD if someone with a real 48K Spectrum can spare a couple of minutes to run it.? …
... the original hardware like a black box and then try to ... all the edge cases the black box seems to generate. They ... 's jumping into the rom where the rom is different on the ... -
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 …
... by me) .It shows a "black screen" on power up . Time ... an NMOS NEC type .The Rom test is OK .So at ... -
The Diagnostic PCBIt arrived in the post today so this is my first go with the Diagnostic PCB. (bought on Ebay) This item , I think , does the same job as Retroleu…
... meaning that ROM paging doesn't work correctly on the black +2A ... -
The Diagnostic PCBIt arrived in the post today so this is my first go with the Diagnostic PCB. (bought on Ebay) This item , I think , does the same job as Retroleu…
... meaning that ROM paging doesn't work correctly on the black +2A ... -
Scrolling loader counter in 85 T-States?Would it be possible to write a scrolling loader counter in 85 T-States? I have a custom screen load routine that loads attribute first, then the …
... coloured stripes, have the border black to start, gradually fill the ... uses IM2 over the literal ROM loader to do a number ... -
ZX80 in a BoxAfter putting a [url="https://worldofspectrum.org/forums/discussion/57916/spectrum-in-a-box#latest"]Spectrum in a Box[/url] a while ago, I thought it…
... can switch to a ZX81 ROM via the DIP switches on ... switches. In combination with the ROM select switches I can now ... circuitry, which provides an improved black porch. So I disconnected the ... -
Screen RatioAn interesting thing happened with my photos on facebook of my Spectrum setup with my new OSSC (open source scan converter). Some made a fuss (in jes…
... command is burned into the ROM of a Speccy. CIRCLE draws ... either prefer it to having black bands down the sides, or ... -
What was your favourite Speccy magazine?What was your favourite Speecy magazine back in the day? When i got my +2 back in 1987 i didn't really but a magazine but in late 1988 my mum came h…
... 7's ROM ROM RAM looks like vacuum molded black plastic with some ... -
128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…
... /> [quote="cj7hawk;975176"]Video is black and white stripes, with missing ... with a modified 16K/48K ROM code...
On a 128K ... model, the 128K ROM is in control at power ... check as the 16K/48K ROM.
[b][i]Mark ... -
128K refurb.... What is the best way?Here's the latest Spectrum I got... Finally got a Toastrack... Not sure if it was good value ( around US$100 ). [img]https://os.blackice.com.au/us…
... and have gone from permanent black/white bars to something that ... working, and I checked the ROM and the addresses being read ... some code running in the ROM to check things further. More ... anyway. Mostly I just get black border and white screen, but ... -
CSSCGC 2021: 25th edition extravaganza![img]https://csscgc2021.files.wordpress.com/2020/12/yellow_programmer_960x600.png[/img] [url=https://www.rickdangerous.co.uk/csscgc2021/][b][size=…
Actually, I'm surprised ICI were around that long. I thought they'd disappeared some time in the 1990s...
Anyway, I digress. Painting games! "Paint It Black" for the ZX80! (Involving ROM graphics.) MUSH! -
How to disable the "scroll?" message?Hello. I'm a beginner Z80 assembly programmer and I decided to make a ZX Spectrum game to practice my skills and gain some more experience. I curr…
... />
setchan equ 0x1601 ; ROM openchannel routine
ld hl ... ; bit_7 PAPER 9
;rom routines , not used
;plot ... off numbers
black equ 0
darkblue equ ...
