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designing a computerHi everyone! I am designing a 4 bit computer and i need some advice, is this a good instruction set? [CODE] BINARY OPCODE DESCRIPTION 00000 nop…
... see the data comes down in a byte from memory chip. First byte ... must select EITHER the first four bits or the LAST four bits, YOu must not ... />
so in total, max of 32 instructions :) -
Transferring games into MicrodriveLast week a big pack of empty microdrive cartridges arrived, and now I'm ready to playing with my little microdrive equipped speccy. One of my aim w…
... br /> This method can be used to transform 48K snapshot files ... the end of the last repeated data section.
3) A 13 BYTE ... of zero cannot be used as the next BYTES in the data stream are the last ... as the profile information can be used to construct the data ... -
Override AUTOLINE start?Hi there, Is there a poke that prevents a BASIC program from auto running, when it was previously saved with the LINE command? Cheers, Steve
... ) ; E_LINE - address of the start of the editing area,
; immediately after the BASIC program ... hl ; HL now points at the last byte of the BASIC program area
call ... to work quite nicely - I used this a lot back in ... -
A clever method of using a single 8-bit register to be used for two things at a timeI don't know if this is the way the SAVE routine in the Spectrum works. Anyway, this is what I've learned today. I've been commented the disassembly…
... used "solely" for one role: to have a counting of how many bits ... of how many bits to process AND to have the value whose bits ... are being written to the tape. ... and also the marker bit to mark the end of the current byte, preventing ... -
+2A/+3 compatibility fixes thread!It might be a good idea to keep these fairly common +2A/+3 compatibility fixes (and requests) in a single thread for quick reference ;) Let's start …
... have a look at the Alkatraz tape loader of the Alien 8 re ... /O port:
; $7FFD (Out) - Bits 0-2: RAM bank (0 ... -7 : Not used (always write 0).
;
; The Editor ROM (ROM ... 0) always places a copy of the last value written to port $7FFD ... -
SE Basic Type-ins^Pete suggested creating a sticky thread for SE Basic discussion. I thought a Type-ins thread might also be useful. Up to the mods if they want to ma…
The [i]Geneva Mono[/i] font used by SE Basic is designed ... /> getxp:
cp 0xfe ; If the last charater was an AT then ... :
ld bc, 7 ; the address of the seventh byte of the
add hl, bc ... -
Proportional Print Routine...Hi Folks, Does anyone know of a good proportional printing routine for the ZX Spectrum? Ideally I am looking for something that prints with charact…
... help yourselves to any useful bits for the standard proportional print code ... /> getxp:
cp 0xfe ; If the last charater was an AT then ... :
ld bc, 7 ; the address of the seventh byte of the
add hl, bc ... -
GUI/OS for the Spectrum?Hi, Is anybody working on a WIMP/GUI system for the Spec? Is there anything current out there? [url]http://snakeoillabs.com/wordpress/2005/10/30/8…
... ; five
rlca ; bits
rlca ; to the
rlca ; left
of the first byte of char data in FONT
; DE points to the first byte of the ... />
; TEXT VARIABLES
; Used by the 64 column driver
Fairlight 2 again - ending, proposed fixOnce again I've been trying to work out Fairlight 2's infamous ending. I think that the following POKE should change the game so that a key could po…
... key could potentially be used to open the final locked door.
and to change the last byte from 3c to - I think ... this value correctly then all of the locked doors in part 2 ... . If you're playing one of the versions which loads part 2 ...Stuck: Multipying 15 by 32 using RRCA in A reg[deleted]
... the carry flag in this instance. RRCA is used here to reduce the ... number of shifts required to ... the low byte of your destination register pair, and the remaining five bits into the high byte ...RFC: 64 column font codeIn BASIC, type CLEAR 49999 then import the code at 50000. Then type RANDOMIZE USR 50000. This will create a new channel and attach stream #4 to it. A…
...
I have used every little trick I ... switch position between bits 0-3 and bits 4-7< ... of the font byte
ld c, a ; store half of the font byte ... %00001111 ; mask half of the screen byte
or c ; ...checking bits in BASICThe question of manipulating bit patterns in BASIC was raised recently in this [thread=35728]Keys redefine routine and key check[/thread] thread. I s…
... +04+24 is the address of the last character of the string "0000000000000000" inside the DEF FN ... )=("" AND USR u)+"0000000000001110": REM Bits of b
4 DEF FN ... ))+FN n(h$(2)): REM Byte hex conversion
1000 DATA ...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…
... only supposed to be used during interrupts? It's ... external peripherals and is used to indicate an ISR ... they are so that the last byte in RAM can be ... depend on RETI being used to terminate ISRs while ... is written assuming portions of the sw will never run ...Is Doctor Who the best that it's ever been?I'm surprised that there's been no Doctor Who thread recently, especially given the revelations we've seen recently. I've loved this last series (and…
... watching it from about the last Tom Baker series up ... episode. When the electronic scream of the theme tune used to kick in ... just as the Doctor ... doomed at the end of an episode was one of the best bits of the original ...Fastest way to mirror a byte?I.E. turning 01100000 into 00000110, in assembly. I'm trying but I suck at stuff with rotation and the carry bit. Any pointers?
...
2: Invert the byte when needed
The following isn't ... the last byte is written
ret
; Of course if I had used ... des des bit order for the load ...Need help with tzxing once again :)You people helped me so much in this thread witch a custom loader: [url]http://www.worldofspectrum.org/forums/showthread.php?t=36109[/url] Maybe we…
... needed. Plus the number of pilot pulses in the 2 parts with ... ROM loading timings, I used the ... Then is just a question of building the TZX (I use Claus ... blocks, loop rounds and the last used bits from the text file and that's ...I am currently playing......Don't know if there's been a thread like this, but I can't find one.... Having seen all the different threads asking people if they've played such a…
... ;583033]I just noticed last night that some of the tables for [b ... and doesn't have all the flashy bits of the others. I believe there ... ]Sonic Generations[/B] over the last couple of days and it's easily ... thinking of buying a guide bok for this one (I used one ...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…
... a chosen value to every byte in a specified range, then ... repeatedly reads each byte in that range and stops ... . It's not unusual for bits of the BASIC program to become corrupted ... chips that were the last lot I had in the Issue 2 Spectrum ...St Dragon (Kixx & MAX Compilation)Hi folks, This title has been doing my nut in for years, and I wondered if anyone knew how to make a working TZX. [url]http://dl.dropbox.com/u/15363…
... ago, about the last byte of each "special" block having only 7 bits. Loading from ... "missing" last bit is actually "almost" there: the 1st half of it is ... found with the last block of side A (the 17th).
The corresponding header (the 16th ...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 …
... on the next byte of the display. Because the instruction DEC (HL) is used, this next byte ... to some of the lower RAM or perhaps some bits in the ROM have ... gone bad and the code being ...stuck on recursive functionI want this function to PEEK 'l' bytes from memory starting at 's' and return them as a string, but however much I fiddle about with quoting and pare…
... t be subtle on the subtlingest day of the year if I ... needs to be used to evaluate the looping expression; the three elements can ... 1) will return nothing until the last byte is reached and will then ... DEFADD area for its version of the variables plus extra stuff ...about Back to SkoolHi All, Back to Skool today! :) [url]http://www.worldofspectrum.org/infoseekid.cgi?id=0000362[/url] I got original tape and make samples for side a …
... to re-TZX it since the last time! :)
It' ... doesn't appear match any of the three copies we've mentioned ... originally I got 7 bits instead of 8 for the last byte so dropped it ... using -ignore. Redid the sample ...Outrun Europa in colourSwainy suggested that he'd like to try his luck with Outrun Europa colorful graphics and see if they can be improved. Let's give him the chance :) A…
... />
Bits 7 and 6 of each Spectrum attribute byte (normally used for FLASH ... ). Bits 0 to 2 (INK) and 3 to 5 (PAPER) of the attribute byte ... will be used as indexes to retrieve ...Copying Files in +3e BASIC (not using COPY command)Hello there my fellow WoS'ers Yet again I find myself in need of guidance, I am sooo close to getting my prototype up. I am writing my own byte cop…
... always calculate the file size as the number of "extents" ... that a file uses times the size of a extent. The ... number of bytes ... byte in the directory entry which can be used to hold the low 7 bits of the ...Spectrum Emulator that supports low resolutions and runs smoothlyHello to All, I have been trying to find a spectrum emulator that will work well through my CRT TV (using RGB to Scart) Most emulators seem to supp…
... try! Which bits specifically?
The overall amount of video signal that ... is clocked out of the display byte shift register on the next CLK7 cycle ... ... I didn't really sleep last night so you might have ...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…
... ][/I])' at address 0x0064. The last byte of this three-byte instruction is 0x5b, which ... it's used when applying memory mappings.
[*]Having the ROM image ... which ended up not getting used, and disciple_rombank defaulting to 1 ...Greetings from the USA.Geetings WOSers from the US of A. I'm in NC today and tomorow I'm getting to experience the joys of a 12 hour academic interview.:-o Oooh foook! Ma…
... any type of lawn mower! Zero hours spent mowing in the last 10 ... your hourly rate. On top of the unpaid overtime you're expected ... "get off the road" or honking their horns (we used to ride ... cars).
The nice bits of the USA (i.e. the bits with hills in ...
