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Wanted: ZX81 caseJust found my old Issue one ZX81, ULA type 8120 (no other markings on the chip). Looking for a case to put it in and hopefully restore to full worki…
... to have the old Klutzed ROM as well with the floating ... 't on a socket but it soon will be. ROM is a ... 2364C.
Only chip on a socket is ... the Z80 and ROM, which kind of ... -
Damaged S2 IC 26?I'm after more advice, pretty please :) On my S2 board there appears to be a damaged chip, it looks to be IC 26 and is marked as 74LS158PC, it appea…
... noticed you have the same ROM as me maybe it's ... chip with a doubled up socket... looks to me like the ... -
48K Ram Check Command not workingI am trying to repair my Spectrum 48k. It is having issues loading games, sometimes they load all the way to launch and then the speccy resets. Oth…
... /Interface2/Cartridges/Interface2_RC_TestCartridges.htm"]ROM cartridge which contains a ... other interfaces that include a ROM cartridge slot (RAM Turbo ... Paul can supply a suitable ROM cartridge.[/URL]
Next, ... an adaptor (using a socket) so that a minor ... -
ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... and are often in a socket. Both this ULA and ... of manufacturers for the mask ROM, and sometimes used EPROM ... code. The first (“old” ROM) code has a significant ... one byte of the ROM code so reducing the ... (the “improved” or “new” ROM) corrects this bug. However, the ... -
128k Toastrack Problem...Ok, so I sold a 128k Toastrack on eBay, absolutely fine, perfect working order, etc (not needed since i've got a +2e now.) Returned faulty, with a c…
... the loading part of the ROM and it should look like ... would say that the EAR socket is picking something up, even ... -
128k Toastrack Problem...Ok, so I sold a 128k Toastrack on eBay, absolutely fine, perfect working order, etc (not needed since i've got a +2e now.) Returned faulty, with a c…
... the loading part of the ROM and it should look like ... would say that the EAR socket is picking something up, even ... -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... a real Z80 from its socket in some device, and plug ... in your emulator in the socket instead, without altering the device ... yes, you can emulate a ROM using a GAL or CPLD ... and data lines as the ROM. So it is emulation, not ... -
A redesigned version of Winston's diagnostic board[U][B]A redesigned version of Winston's diagnostic board[/B][/U] This is a continuation of a project that started in a hijacked thread [URL="http://…
... can take a diagnostic ROM (as in EPROM or ... The SPECTRA can have a socket for a 27C128 16k byte ... then use a diagnostic ROM cart, maybe using one ... />
Of course, the ROM socket option does not offer on ... not offer the same ROM switching that the Diagnostic ... -
Pentagon 1024SL 2.2 + NeoGS (Rev. B) + TSFMSelling the above. NeoGS is perfectly working Pentagon 1024SL 2.2 needs some attention TSFM needs a new CPLD (included) and possibly new YM2203 chip…
It needs a new socket for the main CPLD, previously the computer was _not_ working correctly (wouldn't boot up).
Memory, CPU, ROM, VG93 and YM are working. -
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…
... forget to use the correct socket on the Spectrum :)
ROM's memory test got confused ... -
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…
... a minor modification (EPROM replacing ROM). So I don't think ... and connecting to the wrong socket. But all these have been ... -
Monkey Island On Speccy...I would love to see Monkey Island on the speccy...think it can be done...not as much detail or graphics...but along the same story lines.... What ot…
... cartridge would be only the ROM chip and one chip ... super upgrade interface, using 16kb ROM blocks.
In this ... be accessed directly from the ROM chip (until 4096Mb available ... Speccy? Straight into the expansion socket? Sounds like a kickstarter project ... -
+3e simple ide interfaceHi guys, I want to make a +3e with my +2a. I'm thinking of making the simple 8bit ide interface (internal) and connecting it to a 40 pin ide to sd r…
... /> And theres already a +3e rom for it. I've done ... skeptic about soldering the CF socket...
Perhaps an internal ... -
New Game(s): Sir Ababol 2 and Sir Ababol DXHere is our own Christmas Present from Mojonia! We weren't going to release these games (at least, by the moment) but we decided just yesterday to fi…
... only 144 bytes (it uses ROM print routines just to be ... /> ld a,22 ;rom 'print at'
rst 16
ld a ... ,0 ;y
rst 16
ld a,0 ... ;x
rst 16
plp ld a ... string
ret z
rst 16 ;print ASCII until we ... -
+3e simple ide interfaceHi guys, I want to make a +3e with my +2a. I'm thinking of making the simple 8bit ide interface (internal) and connecting it to a 40 pin ide to sd r…
... /> And theres already a +3e rom for it. I've done ... skeptic about soldering the CF socket...
[/quote]
Sadly ... -
What is the Sinclair ZX Spectrum Vega and what does it mean?Just stumbled upon this Indiegogo page following a tweet from SpeccyNews [url]https://www.indiegogo.com/projects/sinclair-zx-spectrum-vega[/url] it…
... ! With 32K Interchangable ROM slot, or empty ROM socket for Languages and Assemblers ... -
Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…
... .
* Breakpoint on entering/exiting ROM
* Breakpoint on NMI/INT ... Z80 is about to execute RST 08h to display the error ... -
DivMMC Enjoy! Works on 3 of 4 48k Speccy's I own?Hey guys. I have a DivMMC Enjoy! Which is absolutely awesome! Love it to bits. It works perfect on three of my 48k Speccy's, but something isn't rig…
... of certain parts of the ROM firmware.
It seems ... !!!!! Removed old Z80 fitted a socket and then raided my parts ... -
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... to replace the coil, power socket, electrolytic caps and the missing ... 's RAM and with no ROM installed (the pattern is the ... -
Features that are still wanted in Spectrum emulation.Features that are still wanted in Spectrum emulation. 4 USB joystick/gamepad input for real multiplayer games - Yes, Bomb Munchies.... - Sinclair 12…
... .
* Breakpoint on entering/exiting ROM
* Breakpoint on NMI/INT ... Z80 is about to execute RST 08h to display the error ... -
ZX Interface 1 Compatability<p>I wondered if anyone knows of any compatibility problems between the ZX interface 1 and certain Issues of the Spectrum motherboard?</p><p>I just p…
... + what about if I socket the ROM chip and swap the NEC ... in there with a Sinclair ROM chip I've salvaged from ... Issue 2?Would swapping the ROM from an Issue 2 into ... -
ZX Interface 1 Compatability<p>I wondered if anyone knows of any compatibility problems between the ZX interface 1 and certain Issues of the Spectrum motherboard?</p><p>I just p…
OK, so now I'm thinking socket the Z80 and ROM and try swapping and changing with spares that I have. Does that sound like a realistic plan ;) -
Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
Here's something which I converted from a BASIC routine in ZX Computing. The smallint conversion can be discarded if row,col are not derived from some calculation which might render a floating point result. (I can't get the code block to print fixed width, ... -
Double height text...<p>Is here any good routines for printing a font double height?</p><p>I've concocted this ridiculous routine but I'm sure it can be done much better.…
... rather than always using the ROM set.
* Address the display ... using RST $10.
* Simplify the SmallINT check, as the ROM FP_TO_A ... -
Falling Blocks - new game from z80 assembly beginner<p>I started learning z80 assembly earlier this year, mostly from reading Jonathan Cauldwell's "How to write ZX Spectrum Games" and from reading arti…
... are also available in the ROM.
I.e. ATTR-address ... call and then only use RST 16.
(Or open the ... -
Microdrive-Microdrive incompatibility?Hi All! Finally I could get enough Microdrives and connecting blocks (or cable replacement) to make the largest storage configuration of the classic…
... to test a modified IF1 ROM.
[url="http://www.fruitcake ... bad ROM chip, the ROM came from ZXC3 cartridge in IF2 ROM socket.
That IF1 still have socketed ROM... I ... -
Destroyed my ROM. Need a new one...I was messing around with my 48K rubberkey's ROM trying to read its contents with the programmer we have at work but in my haste and excitement I mad…
... ROM - nothing! No continuity! Then I realise that the IC socket ... that I soldered in when I took out the original ROM ... fractured and just touching the socket receptacle. This explained the ... 't destroy my ROM! Just soldered in a defective socket! ~X( < ... -
z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
...
zx specrum rom subroutine, refer to ROM disassembly
THE ... want an asterisk here.
rst 16 ; display it.
... xcoord) ; vertical position.
rst 16 ; print it.
... ycoord) ; y coordinate.
rst 16 ; print it.
... -
z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... . passed to PRINT_OUT in the ROM) as the row & column ... -Xacross,24-Ydown).
'rst' is a quick way of ... at the start of the ROM, so 'rst 16' does the same ... -
z80 assembly helpEver since I was a child I wanted to program my zx81 then my zx spectrum + 2. However, it was such a mystical beast and I only ever used BASIC not kn…
... control code for AT.
rst 16 ; print it.
... a,(ycoord) ; vertical position.
rst 16 ; print it.
ld ... a,(xcoord) ; y coordinate.
rst 16 ; print it.
ret ... />
"rst 16" is equivalent to "call 16". The ROM supplies a ...
