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<1234567…34>
  • 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…

    ... Save value of register into memory
    1110 LOD - Load ... because the address for memory is 8 bits, the ... decoding/ signal control
    Memory
    Variable memory
    Registers
    Control ... in a seperate memory unit from programing memory, that way ...
    Robin Robin October 2010 Chit chat
  • Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…

    ... (ix) = bd 5 -> local memory variable
    ; -3(ix) -4(ix ... (ix) = i 2 -> local memory variable
    ; -9(ix) = pixofs 11 ...
    Sol_HSA Sol_HSA December 2018 Development
  • what extra port for extra memory ? (256K, 512K, 1024K, etc.)I know that Pentagon uses some extra bits from port 7FFD for extra memory pging: - for 512K model, bit 6 & 7 of port 7FFD - for 1024K model, bit 5, 6…

    ... from port 7FFD for extra memory pging:
    - for 512K ... BANKM system variable. By using those bits for extra memory switching and ... to keep track of a memory bank number, by combining bits ... any established port for extra memory, other than the Pentagon road ...
    secarica secarica September 2004 Sinclair Miscellaneous
  • Error Message on memory testI have just tried PRINT PEEK 23732 + PEEK 23733 * 256 on what I think is a 48K rubber key machine and instead of getting either (a) for a 48k unit…

    ... /> I got

    2 variable not found, 0:1
    Is this indicative of screwed memory ?
    ADJB ADJB November 2008 Hardware
  • How do I know where my C compiler is putting my variable?Let me show you my code. I am writing a Z80 emulator (z80.c) which sets up a bit of shared memory for communication with another process. Well, I got…

    ... of shared memory, and initialises a variable bl_ctrl to ... successfully attaches the shared memory to its address space ...
    printf("\nLocating the shared memory segment... ");
    if ((shmid ... variable is not located in the same physical byte in the memory ...
    wilsonsamm wilsonsamm December 2009 Chit chat
  • Loading a screen in to memory...Hi Folks, I want to load a SCREEN$ in to memory and save it out to RAM disk without it being displayed on the screen. I am worried about over writi…

    ... load a SCREEN$ in to memory and save it out to ... worried about over writing BASIC memory so would the following work ... held in the equivalent System Variable.

    Also, once saved ...
    Paddy Coleman Paddy Coleman December 2010 Sinclair Basic
  • Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…

    ... such problems, the paged in memory behaves itself as it should ... to do with a system variable that wasn't loaded with ...
    daveysludge daveysludge October 2014 Development
  • 128k memory musingI've been pondering on the 128k memory thing a bit, and it's just bloody stupid. The 64k memory space is divided in four chunks. One is always los…

    ... stupid.

    The 64k memory space is divided in four ... Third is fixed to usable memory. Fourth is the bankable chunk ... be in the always-resident memory (the fixed 16k + the ... do is increment one 8bit variable.

    Anyway, assuming one ...
    Sol_HSA Sol_HSA May 2017 Development
  • ZX81 Emulator (HARDWARE FREAKS NEEDED!!!!)For the ZX Spectrum I have programmed a ZX81-emulator. ZX81 games can't run directly on a ZX Spectrum due to memory adresses used by the Spectrum (li…

    ... a ZX Spectrum due to memory adresses used by the Spectrum ... program. The screen is at variable locations. Is it possible to ...
    Dr BEEP Dr BEEP March 2002 Sinclair Miscellaneous
  • Character set variableCan anybody help me? I'm trying to find out where the pointer to the ascii character set is. I remember that if you wanted to change the font on the …

    ... /> Does anybody know where in memory that 2 byte pointer lives ...
    Neil^P Neil^P May 2002 Games
  • Memory usageBrowsing the online documentation for the Spectrum I came across a peculiar discrepency. As we all know the start of the RAM is at 16384 which is whe…

    ... is where the screen memory resides. The screen memory ends at 23296 ... is what on earth the memory before KSTATE and after the ... video memory is used for on a ...
    cyborg cyborg November 2002 Sinclair Miscellaneous
  • BASin Release 6 available for DownloadHi all - It's another cut'n'paste from CSS :) I've been tapping away again, and seeing as a couple of people have recently seen BASin's latest bits…

    ... - 0 Ok, D BREAK, 2 Variable not found etc all appear ... them).
    Added a simple memory viewer - readonly atm, but will ... (faster than an expression) and memory location bytes, words and DWords ...
    Dunny Dunny June 2003 Emulators
  • 128 Memory PagingI'm having a problem getting my brain around paging. Well, actually the bit I don't understand is how reading I/O ports works! I hope the collective …

    ... />
    Port 32765 controls the memory paging. Bits 0-2 determine ...
    trellis trellis August 2003 Sinclair Basic
  • ZX80/81 memory expansion and 48k + Lightpen for saleAll are in original packaging and the lightpen has it's software and manual. The memory expansion is a 16k one. E-mail me at [email="patrick@wych01…

    All are in original packaging and the lightpen has it's software and manual.

    The memory expansion is a 16k one.

    E-mail me at [email="patrick@wych01.freeserve.co.uk"]patrick@wych01.freeserve.co.uk[/email] if intrested..
    zeropolis79 zeropolis79 September 2003 Sales
  • memory is filled up under Win XP when opening many filesDear friends, I have the big and strange problem that ZX-Rainbow's game scanner is not working properly under Windows XP. I figured out (during a ti…

    ... in the virtual memory), so that the memory is filled up with ... the file stream, freeing the memory.
    I wrote another testing ... the complete file content in memory.

    The problem does ...
    Seejay Seejay April 2004 Development
  • Memory Available for 16k and 48kAm I right in thinking that if I am writing a 16k Game, I have 8k available for the machine code prog 6000h to 8000h, and for a 48k game I have 40K a…

    ... /> If so, what are the memory areas available for 16k and ...
    robpearmain robpearmain May 2004 Development
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... from the data bus. The memory at location 256 * I + b ... value in the NMIADD system variable (23728) if it was non ...
    Philip Kendall Philip Kendall July 2004 Development
  • Strange layout of Spectrum video memoryHello, does anyone have an idea why the Spectrum's video memory has such a strange layout? I understand that a resolution of 256x192 is an easy mean…

    ... why the Spectrum's video memory has such a strange layout ... it easier to address video memory. I also understand that the ... ) are a compromise to limited memory. But where does the line ...
    J?rg Pleumann J?rg Pleumann August 2004 Sinclair Miscellaneous
  • Character SetAlright, this may not be the right forum for this question (it does sort of relate to a game which I'm trying to get working properly - long story) -…

    ... anybody know where the system variable is that points to the ... the ROM?
    Unless my memory is mixed up, there is ...
    Neil^P Neil^P August 2004 Games
  • SPIN - debugger / fill memory / how ?I try to fill the screen with 00 value, but I don't get the expected result. - pause the game - debugger - hex numbers - fill memory block - fill wi…

    ...
    - hex numbers
    - fill memory block
    - fill with 00 ...
    - main memory
    - start address - 4000
    - ok
    then
    - view memory
    - all screen data is ...
    secarica secarica October 2004 Emulators
  • BASin Release 11 out nowBASin has been updated once again, for your BASIC programming pleasure! Get it at: [url="http://homepage.ntlworld.com/paul.dunn4/BASin_r11.exe"]htt…

    ... menu, BASin now support variable inspector tooltips. Hover your ... variable name and as long as it's been declared in memory ... , a tooltip will appear containing a description of the variable ... delete the corresponding line from memory if it exists!
    ...
    Dunny Dunny November 2004 Emulators
  • Data at the top of memoryWhilst viewing memory locations on the "Spin" emulator I noticed data starting at 65336. Does a "real" ZX Spectrum 48k use the top end of available m…

    Whilst viewing memory locations on the "Spin" emulator I noticed data starting at 65336. Does a "real" ZX Spectrum 48k use the top end of available memory ? If so, what is the last memory location that is safe to use ?
    Mr Millside Mr Millside February 2005 Development
  • Emulator Dev: Memory Use When Loading RZXsHi, I am currently working on a port of an emulator to a system with limited memory (64mb). I am running out of memory when loading large snapshots …

    ... to a system with limited memory (64mb). I am running out ... of memory when loading large snapshots (ie ... let me know how much memory is needed to decompress a ...
    Crabfists Crabfists June 2005 Emulators
  • ANNOUNCE: BASin Release 12 ready for downloadWell, after a rather large break, BASin's latest incarnation is ready for public use. Probably. BASin is a Sinclair Spectrum development environme…

    ... br /> Multifunctional Watches - watch memory addresses, variables, expressions, sysvars
    Memory Map which shows the ... use any BASIC construct and variable.
    Token Table - ... for sending Speccy display memory to the PC screen ...
    Dunny Dunny June 2005 Emulators
  • ANNOUNCE: BASin Release 12 ready for downloadWell, after a rather large break, BASin's latest incarnation is ready for public use. Probably. BASin is a Sinclair Spectrum development environme…

    ... br /> Multifunctional Watches - watch memory addresses, variables, expressions, sysvars
    Memory Map which shows the ... use any BASIC construct and variable.
    Token Table - ... for sending Speccy display memory to the PC screen ...
    Dunny Dunny June 2005 Sinclair Basic
  • Speed of variables vs. POKE/PEEKGreetings, I'm sure I could probably find this out after careful study of the 48K ROM disassembly, but I was wondering whether someone already knew …

    ... /> Suppose BASIC encounters a variable reference while parsing. In order ... the actual memory address where the variable's data ... />
    Does the variable reference contain this address ? Or ... an absolute memory address instead of using a variable ? Obviously, ...
    GOC GOC September 2005 Sinclair Basic
  • Spectrum Key Codes?Hi guys, I have just been reading up about the Sinclair Keypad that was released to accompany the 128K. I read this on the a website, this was refe…

    ... stored in a System Variable named LAST_K at memory location 5C08h'.
    KeepGood KeepGood October 2005 Sinclair Basic
  • Interface 1 Memory Map(I'm not sure which section this post should go in, but here seems as good as any) Since the Interface 1 ROM is only 8k long, does anyone know what …

    ... appears in the 8-16k memory range when IF1 is paged ...
    MikeW MikeW May 2006 Hardware
  • Wanted: Gamecube memory cardI'm looking to buy a gamecube memory card. I don't need a large capacity memory card but a card that can save information for upto 3 games will do. I…

    ... looking to buy a gamecube memory card. I don't need ... a large capacity memory card but a card that ... they own or a used memory card (in working condition of ...
    Arjun Arjun May 2006 Chit chat
  • Calling ROM routinesFirstly, sorry if this is the wrong forum to post this in, but I wasn?t quite sure under which heading is best fitted. I?m trying to figure out how…

    ... discover where a variable is stored in the variable table (as ... the name of the variable in any random memory location, and put ... ADD? I presume the variable name cannot just be the ... the encoded byte indicating the variable type?

    Secondly, ...
    trellis trellis July 2006 Development
<1234567…34>

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