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<1234567…34>
  • maximum addressable RAM for a Z80 using bank switching?What is the maximum addressable RAM for a Z80 using bank switching? The Enterprise64 home computer could address up to 4MB, is this the limit for a …

    ... RAM for a Z80 using bank switching?

    The ... ?

    A bank switching scheme allows the memory to ... four pages (2 to 5) are reserved for a ... storage of program code and data as well. On ... used by external devices and memory modules connected to ...
    Rebelstar Rebelstar February 2013 Hardware
  • 128K memory bank selection to avoid contention issuesI'm currently developing a game and I'm trying to get my head around the memory contention issues of the various 128K/+2/+2A/+3 spectrum models in or…

    ... in, so without any bank switching, that is where any ... 5 and 7 are contended and that for models +2A/+3 banks 4,5,6 and 7 ... screen. I understand that bank 2 is already resident at ... 128K/+2 and if so load into bank 4 or ... 6, and if it is ...
    adrian_singh adrian_singh May 2017 Development
  • How did bank switching work on the 128K Spectrums?I'm new to Z80 and ZX Spectrum. So I was wondering how the 128+ models managed to work with more than 64K of memory? I'm somewhat familiar with h…

    I'm new to Z80 and ZX Spectrum. So I was ... 'm somewhat familiar with how bank switching works (I believe the Apple ... had a weird way of switching banks...IIRC). Anyway, any insight ...
    cbmeeks cbmeeks October 2015 Hardware
  • enJine: a fast tilemap enginetile engine based on excellent work by Joffa Smifff. here you can download first tech demo. [url=http://ketmar.no-ip.org/tmp/enJine.tap]Get It Now![…

    ... i can't use page switching for code/graphics part. ... shame about the 128's bank switching, you'd think they ... around just to try and keep the important stuff ... the last 9k of banks 5 and 7, or interleave it so ... in bank 5 and code for the even frames is in bank 7)
    kphair kphair May 2011 Development
  • The best (and worst) Second-sequel.When a film series gets to #3, one of two things usually happen: It's either going to be the best of the series - as the company now know how to tre…

    ... the slapstick comedy and falling about, and they tightened up ... skiers? Perfect! Flooding complex and towing inferno style disaster? ... make it so slow and dull? And in 3D? Remake please ... , but Robocop 5 onwards improved all that. 5 and 7 are my favourites ...
    Graz Graz March 2010 Chit chat
  • Quick question regarding contended memoryIf I've read the documentation correctly, the following applies: 128k/+3 "Memory banks 1,3,5 and 7 are contended" +2A/B/+3 "RAM banks 4, 5, 6 and 7…

    ...
    "Memory banks 1,3,5 and 7 are contended"

    +2A ...
    "RAM banks 4, 5, 6 and 7 are contended."

    That ... speed on all machines, only bank 0 and 2 are usable, correct?
    Sdw Sdw May 2012 Development
  • Velesoft's ZX128+2 with 1.5MB memoryMy old ZX128+2 PROFI (grey model - spanish version) for sale here: [url]http://aukro.cz/super-zx-spectrum-128-2-1-5-mb-i2738723874.html[/url] Back s…

    ... br />
    Computer is extended and modified:

    - ... external divide interface). Easy switching between systems from basic.

    - easy switching between 8-32 different ZX ... first 8kB in ram pages 5 and 7 (both videorams). Some russian ...
    velesoft velesoft October 2012 Sales
  • 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…

    ... /> - bank 3
    - bank 4
    - bank 5 screen / always resident
    - bank 6
    - bank 7 ... screen

    Since banks 5 and 7 need to ... , 4 and 6 (plus the non-video portion of bank 7) would be ...
    Sol_HSA Sol_HSA May 2017 Development
  • A game that took the Spectrum to its maximumWhat Spectrum games took it to the maximum of its capacity? I think R-Type is a good example. What are yours?

    ... 128K Spectrum model. 5 & 7 video page switching is from bit3 / port ... other games that both page 5 and 7 screens?[/quote]
    I don ... with pages 5 & 7 one near the other one (and not vertical ...
    secarica secarica December 2002 Games
  • compatibility between ZX computers?Hey all, I'm new here :) I was wondering about compatibility between ZX computers. Is it possible to run a game made for ZX80 on a ZX Spectrum? Or a …

    ... thought I'd add that BANK 2 is not the normal ... screen memory Dr Beep - BANK 5 is.

    0 to ... can safely page RAM 7 out and it'll keep the ... 16k of RAM for emulation and the ZX81 isn't exactly ... hence the use of RAM 5 and 7 as the screen pages.
    cyborg cyborg July 2003 Sinclair Miscellaneous
  • Cylu doesn't work in 128KI've played hundreds of 48K games on my original Spectrum 128K+, and all of them load fine, which is more than can be said for the plus2 Spectrums. H…

    ... went a bit beyond that and they had enough trouble cramming ... of WTSS uses video pages 5 and 7 switching mechanism, therefore to make it ...
    secarica secarica September 2004 Games
  • Games not compatible with real grey +2There are many threads about Spectrum+3/2A incompatibility issues but what about grey +2? I've found that games like Marauder and Skate Crazy don't w…

    ... -127 then you get snow and any attempt at executing code ... contended pages are 1, 3, 5 and 7.

    But since the ... contended pages were 4, 5, 6 and 7 (and it didn't crash when ... bank is paged in and causes a crash on the original 128K and and ...
    Jmk Jmk January 2010 Games
  • Games not compatible with real grey +2There are many threads about Spectrum+3/2A incompatibility issues but what about grey +2? I've found that games like Marauder and Skate Crazy don't w…

    ... -127 then you get snow and any attempt at executing code ... contended pages are 1, 3, 5 and 7.

    But since the ... contended pages were 4, 5, 6 and 7 (and it didn't crash when ... bank is paged in and causes a crash on the original 128K and and ...
    Alcoholics Anonymous Alcoholics Anonymous January 2010 Games
  • Alice in Wonderland (FULL VERSION!) on ZX SpectrumNot really a game but a film and I'm uncertain which forum to put this in so (Moved it to Misc - Mod).... I've uploaded two tap video copies of [B]A…

    ... this with my DivIDE+ and real 48K Spectrum. Unfortunately, ... (only that page 5 and 7 are swapped and therefore the load always ... trying to do it and Digital Prawn was doing ... can't get page switching to work properly every ... stuff to go to page 7, sometimes I can't ...
    mulder mulder May 2010 Sinclair Miscellaneous
  • Alice in Wonderland (FULL VERSION!) on ZX SpectrumNot really a game but a film and I'm uncertain which forum to put this in so (Moved it to Misc - Mod).... I've uploaded two tap video copies of [B]A…

    ... different (only that page 5 and 7 are swapped and therefore the load always ... was trying to do it and Digital Prawn was doing it ... I can't get page switching to work properly every time ... stuff to go to page 7, sometimes I can't. Code ...
    Alien 8 Alien 8 May 2010 Sinclair Miscellaneous
  • zx spectrum +2 troubleshootingHi There I am new here and I need some advise as to where to look for issues on my zx spectrum +2 it was working fine this morning .. then while pl…

    ... : contended and not contended. Each chip inside one physical bank contributes with ... the non contended memory bank. Pages 1,3,5 and 7 are stored in ... the contended memory bank.

    mcleod_ideafix mcleod_ideafix October 2010 Hardware
  • New interface for ZXThis is my old (2004) unfinished project of internal interface for ZX Spectrum 128+2: ([url]http://velesoft.speccy.cz/hardware_in_development.htm[/u…

    ... first 8kB of ram pages 5 and 7(both videorams) are contended ... to 8 DIVIDE systems and is enable switching between this systems ... (compatible with DIVIDE+ memory) and enable use system ESXDOS with ... (reading/writing).

    And games from INTERFACE 2 can ...
    velesoft velesoft February 2012 Hardware
  • Double Dragon Remake: The Development ThreadOk guy's, so this is the new thread that will be focusing on Jim Bagley's development of the Double Dragon remake that was first proposed by myself a…

    ... ]...and make sure your table is always in an uncontended RAM bank ... /> summary:
    128k and +2: pages 1 3 5 and 7 are contended
    +3 and black +2: pages 4 5 6 and 7 ...
    guesser guesser February 2012 Development
  • Red DwarfA Red Dwarf video game - good or bad idea? (given its recent resurgence in popularity in the UK) My ideas: [b]Plots[/b] - An interquel which bridg…

    ... 0, 1 and 2 and cache the resultant data into bank 3, then ... switch modes and write that data ... out of bank 3 onto one ... the screen block between banks 5 and 7 it would be far better ...
    joefish joefish February 2013 New game ideas
  • Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…

    ... Screen, 0x4000-0x7fff and 128K banks 1,3,5 and 7 are all contended ... . Expect an extra delay of 0-7 ... executing code in a contended bank, your execution time will ...
    This presumably means turboloaders and beeper sound routines can't ...
    GoingDigital GoingDigital September 2013 Development
  • coding guruOk I'm looking for a to help me in my quest to do my first proper game. The 80's child in me thinks he can do it, But the 2013 man in me knows zip. …

    ...
    I would use bank 5 for the screen (the one ... sense to use a second bank (bank 7) for the screen if ...
    I would use bank 2 for the code (the ... the bank running the code to be paged out and ... 5, and 7 are contended on the early 128s, banks 4, 5, 6, and 7 ...
    chev chev September 2013 Sinclair Miscellaneous
  • Plane confusing...Nowhere near as exciting or complicated as one of Morkin's quizzes, but... Can you work out which game's loading screen was loading into which of ZX …

    ... the planes reside in bank 5 and 7 at offset 0 and $2000 then you ... bank 7. The four plane mode would only work for new titles and ... existing games where the 6144 bytes at offset $2000 in bank 5 ...
    chev chev July 2014 Games
  • Plane confusing...Nowhere near as exciting or complicated as one of Morkin's quizzes, but... Can you work out which game's loading screen was loading into which of ZX …

    ... planes. At offsets 0x0000 and 0x2000 in banks 5 and 7.

    The ... the planes reside in bank 5 and 7 at offset 0 and $2000 then you ... and existing games where the 6144 bytes at offset $2000 in bank 5 ...
    JeffB JeffB July 2014 Games
  • 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…

    ...

    [quote]Since banks 5 and 7 need to be banked in ... 1) You keep 5 and 7 both in memory and you swap them around ... 2) You swap 5 and 7 in the top bank, and use the same code ... MCP, and jumped into. [/quote]
    Another problem with bank 7 is ...
    Timmy Timmy May 2017 Development
  • Reading Disks via ASMI'm hoping to port my Amstrad game to the spectrum (See the link in my sig for info) I will be targeting the 128 and +3 - the game will not work on …

    ... by basic and the +3 disk rom (which uses bank 7 for ... spare banks, for banks 5 and 7 - so basic and the disk system shouldn ... times (at 8000 and C000) , and used bank swapping to flip between ... screen buffer using bank 7, and only C000 can bank flip with the ...
    keith56 keith56 July 2017 Development
  • Which 128k games actually used 128kA lot of 128k games were 48k games with decent AY music, or used screen flipping features, What games actually used 128k, e.g. all banks for game …

    ... music” required a separate bank, because it wouldn’t ... by “screen flipping features.” Banks 5 and 7?

    I really ... to rewind the tape and load Level 1 if ... you died on Level 5. Does that count? [i ... over-the-head throw) and an extra mini-level. Not ...
    Ast_A_Moore Ast_A_Moore April 2019 Software
  • Which 128k games actually used 128kA lot of 128k games were 48k games with decent AY music, or used screen flipping features, What games actually used 128k, e.g. all banks for game …

    ... AY music” required a separate bank, because it wouldn’t fit ... by “screen flipping features.” Banks 5 and 7?

    ....

    The ... are graphics, level design, maps, and text.[/quote]

    Thanks ...
    robpearmain robpearmain April 2019 Software
<1234567…34>

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