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writing an emulator-newbie needs helpHi, this is my first post here. I decided to write a minimalistic emulator of ZX Spectrum-no emulation of advanced peripherals, no emulation of sound…
... white squares) appear in the upper part of the screen (main ... ran some short procedure in Basic) I think it's safe ... -
Casstte 50 compilation emulator game questionHi - Hope this is the right place to put this question? Wasn't sure? But I have just downloaded the 'Cassette 50' compilation from wos but can't w…
... /> I haven't written speccy basic in years, far more used ... LOAD. Line 645 only accepts upper-case "A". Line 302 should be ... -
Keys redefine routine and key check.I have written some asm code which allows me to redefine keys (for a game etc.), and also allows me to be able to check any keypresses for the redefi…
... just in case anyone wants to use it from BASIC
ret ... address
ld a,2 ; upper screen
call CHAN_OPEN ; get ... -
New WIP underway - 'Dingo'.Hi, Prepare for a long post. Perhaps I can even challenge ewgf here. :razz: Anyway, I've been meaning to get into Z80 programming and making a game…
... just in case anyone wants to use it from BASIC
;ei ... address
ld a,2 ; upper screen
call CHAN_OPEN ; get ... -
How to - ZX Spectrum Composite Video ModI received a link to this in my mail. [youtube]ls0DpzCmqjk[/youtube] A nice instructive video. I'm still leaving it to the experts though :-)
... remove the board from lower half o/t case: if you unsolder ... , you can just move the upper case part aside far enough to ... , [B]but not remove that case half[/B]. That way you ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... ve written a very simple BASIC program that writes a ... unusual for bits of the BASIC program to become corrupted too ... over an area of the upper 32K of RAM for ... the very top of the lower 3rd of the display ... bus/control signal for the lower RAM.
Are ... -
Repairing a faulty 48K issue 2.I am investigating one of a pair of non-working issue 2 48K Spectrums that have been sitting in a cupboard untouched for quite a few years. I haven…
... the CPU to refresh the lower RAM when the ULA isn ... fairly specific. I ran a BASIC program that first filled an ... the test over the upper part of lower RAM), so the problem ... -
Arcade Game Designer 2.0 releasedI know dozens of you downloaded the previous version of AGD. Well, you can put it away now because I've made some major improvements to that version…
... /> if block=3 'e.g. upper spikes
other
let ... -
Creating a new game - AssemblySo... finally I?m studying Assembly Z80... after 36 years. :) Well... it?s sooooooooooooo hard to make a game using Assembly? I bought a book (Spectr…
... , D holds the upper 8bits, and E the lower. There is nothing ... it is a very simple case!
If someone took ... -
Rubber 48k troublesHi. I've just got a 48k to add my collection, but it seems doesn't working well. The computer starts ups finely, but it doesn't load the games. So fa…
... =Spirantho;597771]One of your upper RAM chips almost certainly has ... have a multiface, use a BASIC program to do the same ... any case, I will look around to find a BASIC program that ... -
Repairing another Issue 2 48K Spectrum.I said at the start of the other thread that I've got another one of these and I've started investigating it. The board is more-or-less exactly the …
... post an update in case any of you were ... a Spectrum with its lower RAM removed and so ... The signals at all the lower RAM socket pins look reasonable ... be a problem with the lower RAM, but that something ... get stuck. Perhaps an upper RAM problem could cause this ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... to variable ZXBASIC_MEM_HEAP inside ZX BASIC's library code, but this ... ENGINE was moved like 4K lower, but even so this would ... solution for ZX BASIC, because in this case all ZX BASIC programs would ... command-line parameter in ZX BASIC Compiler to specify heap ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... this case, sub-routine "BIFROSTstart()" could make the necessary changes to upper ... assembler/compiler, but in this case Pasmo was the only assembler ... an ASM file that ZX BASIC can compile won't be ... would require changes on ZX BASIC's built-in assembler, or ... -
A new multicolor engine called BIFROST*I'm glad to announce the release of a new multicolor engine implemented by yours truly, including high quality 16x16 tiles designed by R-Tape: [IMG]…
... => LO(65283) (LSB, or lower byte)
65283 / 256 = 65283 ... * 9 + c
In this case, you don't seems to ... perform some optimizations in the BASIC itself (not yet done). This ... -
LZ77 en/decodingI've written an LZ77 en/decoding routine as I couldn't find one around for the Spectrum. Initially I'm just doing it in BASIC to get the logic right.…
... off it...
ONLY the lower digit of reg A is ... self if you need those upper 4 bits. Wich you will ... in memory.
The basic code are down in red ... -
Difficult to find upper RAM fault.I've recently repaired an issue 3B 48K Spectrum that had a tricky to diagnose upper RAM fault, so I thought I'd post a report of what I found here. …
... that never tries to test upper RAM, so I can boot ... mode and perform test using BASIC or assembler.
Recently ... , this ROM doesn't use lower memory at all (except for ... a Spectrum with lower RAM bad chips. System variables, BASIC pointers, etc ... -
Toastrack problemMy toasty started behaving oddly last night. Basically typing random characters itself, I first noticed it when I had my divide+ plugged in and a con…
Wait. The columns and rows connected to ULA might not be the same as you see on the physical keyboard. Can you give an example of chars? Also, are there only one case or both lower and upper case? -
Toastrack problemMy toasty started behaving oddly last night. Basically typing random characters itself, I first noticed it when I had my divide+ plugged in and a con…
Computer pranksAnyone ever play a computer prank on a friend, or had one played on you? Here's a few which will make you laugh that I did back in the day... In 19…
... past.
The BASIC was also pretty fast. A ... a 'BBC Emulator' in BASIC that gave the impression of ... who were typing in a BASIC listing, only to find ... once convince someone in a lower year that I had ... they had computers on an upper floor in Boots, and ...WibbleBibble's Basic threadHi in an attempt to keep my questions from spamming the forum. I think its better to put them all in one place. Thanks everyone so far, I feel I am …
... into a exercise in debugging basic.8)
That said ... have the movement commands in upper case... hmmm
limitations of ... when you want to switch case... hmmm...
ah well ...strange solution with bad spectrum +2 t.v. sound2 weeks ago I bought a British 128 K ZX-Spectrum +2. At first it didn't have sound on the t.v. RF output. Adjusting L5 (IC 11: MC1376 audio modulato…
... still hear some higher and lower pitched noise on the t ... seems to be present in basic mode.
I received ... some extra space in the case.Very weird +2 problem.After two days, I'm still fighting this grey +2. Symptoms: When I first got it, there were stray pixels on the screen, and stray lines and colours. …
The lower 64K is made of new ... was running it without the upper 64K at all a bit ... . And the coil, just in case. And the 7805 regulator.
Spectrum in black TS1500 case with grey "Sinclair ZX Spectrum" labelAt the Spectrum30 event yesterday, someone had brought a Spectrum like object with an unusual case and I never did find out whose it was or where it …
... a DCK file where the upper 32K of the HOME bank ... that details the full ts2000 basic, including additions like SOUND and ... I can locate it in case it contains anything interesting. I ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... knowledge of ZX Spectrum basic, and the ZX Spin ... returning to BASIC
;return score to BASIC
... calling program' (in our case a BASIC routine) is 'ret'.< ... code function called from basic will return the value ... If it is odd, lower the road position in hl ...Diagnosing a strange software fault in a 48kHi, A friend gave me a 48k, which I am very keen to restore. The spectrum 48k was my first computer over 20 years ago and I owe my ability to code t…
... ; shows image (which needs lower RAM + video encoder to work ... -5V missing can kill lower 16K chips in short order ... 3) times just in case it's a bad contact ... various tests to make sure lower 16K works 100% ( ... to determine if/where what upper memory chip(s?) are ...smooth movement in basicWas trying to figure this out myself but i would like to be pointed in right direction now :-). How do I make something move in Basic without gettin…
... x5 if doing it from BASIC with a number array).
case comparing:
[b]PRINT AT ... array is needed for the upper screen. BASin timings averaged over ...Joystick Interface with built in RAM expansion?Is there such a thing as a RAM pack with a joystick interface built in?
... in the upper area.
I left the screen and lower basic area ... to use it with standard Basic and the Opus Discovery and ...Project on ZX Spectrum in UniversityHi everyone, I am Max, student of media studies in berlin, and I have to do a little project on the spectrum. I am working on a sinclair zx spectrum…
... the letters inside the string upper case and it will work
