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<1234567…34>
  • ZX80 and 81 hardware questionsI'm finding a lot of the documentation that is ostensibly about the hardware of the ZX80 and 81 to be primarily about the software. I was hoping some…

    ... active, the machine inspects the data bus. If bit 6 is set, it declines ... value on the address bus is latched. Also bit 6 of the address ... . I'm unclear whether bit 6 is latched or merely echoed ... NMI is generated directly from bit 6 of the refresh address, meaning ...
    Thommy Thommy September 2011 Hardware
  • IN Port FE bit 6 confusionI know I've got this wrong. Tapes load fine but it all feels messy. Currently my emulator does this: Sets bit 6 of the result to 0. If (and only if…

    ... does this:

    Sets bit 6 of the result to 0 ... the address is 0 then bit 6 is set based on ... the opening copyright text until bit 6 of result is 0.
    bit of the final byte ... something about OUT FE affected bit 6, is this what I'm ...
    Unique Unique March 2005 Emulators
  • Data bus at interrupt timeIt is "well known" that some peripherals can put values other than 0xff on the data bus at interrupt time, thus meaning that IM2 is slightly more fid…

    ... other than 0xff on the data bus at interrupt time, thus meaning ...
    Philip Kendall Philip Kendall March 2009 Hardware
  • Why did the QL fail?Browsing some old magazines: an advert appeared for the QL, 128k of ram and 32 bit processor etc...also very cheap compared to other similar spec com…

    ... at a time across the data bus.[/QUOTE]

    ... bit internally, with an 8 bit internal data bus. It has to do 16 bit ... see that the 16 bit arithmetic operations are really ... an 8 bit external data bus, 16 bit internal data bus but with 32 bit registers. ...
    Winston Winston January 2009 Sinclair Miscellaneous
  • Edge Connector InformationHi Everyone, Hope I'm posting in the correct forum. I've recently been playing with an Arduino and got to thinking it would be fab if I could do so…

    ... CPU signals. This includes the data lines (data bus), the address lines (the ... is writing a data byte on the data bus (8 bit = one byte), the ... supply a byte of data on the data bus.

    All ... then captures the data byte from the data bus at the right ...
    1024MAK 1024MAK April 2014 Hardware
  • Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…

    It looks like it. The edge detection is done by XORing the sample from EAR bit 6 with the previous sample, and treating non-zero as an edge.

    http://www.worldofspectrum.org/ldbytes.html (05ED LD-SAMPLE near the bottom).
    colonel32 colonel32 March 2020 Development
  • Broken keyboard due to broken ULARecalling csmith's thread about dead ULAs, a thread appeared in the Zonadepruebas (Spanish) forum regarding... a dead ULA, but only a partially dead …

    ... with reading bit 6 from port 254, which is the EAR bit.

    data bus on the Z80 side (the data bus for the ... that the keyboard data goes out onto the data bus.

    To ... -D4 of the CPU's data bus. With the blue cable, the ...
    Winston Winston October 2010 Hardware
  • pc keyboard for speccyis it possible to use a ps/2 keyboard for a speccy. I have a +2A, spectrum+ and toastrack, which all have broken keys. So an external keyboard woul…

    ... bit value to output to the CPU (the CPU data bus ... PIN 4 = EAR ; /* EAR input signal, ... ; /* */
    PIN 6 = KB1 ; /* */
    mcleod_ideafix mcleod_ideafix April 2012 Hardware
  • IN and OUT in hardware terms... what are 'ports'?Hi all, I understand PEEK and POKE, but have never managed to get my head around IN and OUT. The books all go on about how they read from and wri…

    ... use of the same address bus, allowing them to request ... .

    As some data is read-only, some is ... ] of these ports, bit 6 is the EAR input, for reading from ... results in a [i]bus collision[/i] which is ... to choose a different address bus line in its [i] ...
    zub zub September 2015 Hardware
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... then treated as a 16 bit word (LSB of course) ... placing random bytes onto the data bus means a random opcode could ... 'n':

    * M1: 6 tstates: acknowledge interrupt and decrement ... cycles:

    * M1: 6 tstates: acknowledge interrupt.
    * M2 ...
    Philip Kendall Philip Kendall July 2004 Development
  • IN 255 behaviour not emulated in Spectaculator and ZXSpinI'm not speaking about "normal" IN 255 behaviour. All of you know what I'm taking about: IN 255 can be used to "read" screen data as it's retrieved f…

    ... used to "read" screen data as it's retrieved from ... org/foro/viewtopic.php?f=6&t=1194& ... the loop while waiting for bit 7 to be cleared. ... ULA has been released the data bus, and the Z80 can ... only read FFh (floating bus).

    Convinced myself ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • 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…

    ... have verified connectivity of the data bus lines between the CPU and ... 0-5V clock at pin 6 of the CPU.
    < ... the rise times look a bit long.

    - WE ... 4V square waves on all data bus lines at the CPU.
    bit low to me if
    Zorn Zorn November 2011 Hardware
  • Hardware description - BETA DISK interfaceExist more versions and clones of BETA DISK interface. Beta disk 48, beta disk 128, brasilian clones of beta disk 48, russian clones of beta disk 128…

    ... BETA128 contain throught ZX bus for possibility connect next external ... not connect to throught bus devices with own external ... devices connected to throught bus. If TR-DOS rom ... 5 = unused (ignored)
    bit 6 = data request
    bit 7 = interrupt request
    velesoft velesoft August 2013 Hardware
  • Using even ports for input?I've been looking for unused ports to use with my clashbasher interface. I understand that the spectrum only considers A0 when decoding its input p…

    ... read of the keyboard and EAR socket.

    However the ... a byte from a eight bit counter to port FF00 every ... game tape playing into the ear socket. The spectrum seems uneffected ... spectrum through contention on the data bus? Are there othere models of ...
    Basher Basher January 2014 Hardware
  • Spectrum 48k Clock SpeedSo I was reading the [url="http://www.worldofspectrum.org/pub/sinclair/technical-docs/ZXSpectrum48K_ServiceManual.pdf"]Spectrum 48k Service Manaul[/u…

    ... 6.

    [i]3.1 The Z80A is an 8-bit ... buses are the Data Bus, Address Bus and Control
    Bus respectively.[/i]
    msansom msansom February 2017 Hardware
  • Understanding tape edgesI've never done any tape reading code. But I've read about these "edges" on multiple occasions. Trouble is I don't understand what they heck they are…

    ... />
    1) EAR input is a bit input (bit 6 reading the fffe ... voltage instead of sound to EAR input? Would it still ... Hz (note C) to EAR and try to read ... to modulate data?

    4) Is EAR port always ... How sensitive to change is EAR? Does it take time ...
    tstih tstih April 2017 Development
  • Exact emulation of the Snow effectAs the original post on another forum is outdated, and for those who don't know about that forum, I duplicate this info here: At the beginning of …

    ... the ULA on the address bus. In the course of my ... interference of reading ULA screen data and memory regeneration leads to ... the pixels1/attributes1 addresses the bit 6..0 of address is replaced ... double effect — the pixels2/attributes2 data will not be read, and ...
    weiv weiv October 2022 Emulators
  • WANTED: tape replacement for +2?Any tape replacement possible for a +2? My +2 works wonderfully but the incorporated datacorder is simply worn out and won't load ANYTHING. Dirty sig…

    Bit 6 of IN-port FE is the ear input bit. The value ... reset will give a reset bit 6 from IN 254.
    bit 6 is 1 if the voltage ... will always return a set bit 6.

    Bits ... of each other. The data and address buses of the ...
    Dr BEEP Dr BEEP November 2001 Sales
  • My own Home Computer It's true. My company are planning to build a new Home Computer. It will use a Z80 CPU running at 6mhz, 128k Ram and will run all Spectrum and ZX81 …

    ... as 32k program and 32k data, the video and paging is ... modes are enabled.
    If bit 6 is ser 256 colour mode ... the small difference that bit 7 is 0, bit 6 is OR'd ... !!! Maximum possbilities.
    Dedicated ear and ear/mic, ear having AY output and ...
    cyborg cyborg October 2002 Sinclair Miscellaneous
  • Fire Ruby - More HelpI cant pass the spikes in the fire ruby by lawrence creighton, can someone please help? [ This Message was edited by: welsh_brawler on 2003-08-08 21…

    ... v2.1

    General data
    ------------

    Locations 29 ... Wally, "probably worth quite a bit."{6}Having thus offered his opinion ... /> Message 73
    {16}{6}{6}{6}The bus pulls away

    Message ...
    BadBeard BadBeard August 2003 Games
  • InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…

    ... then treated as a 16 bit word (LSB of course) ... placing random bytes onto the data bus means a random opcode could ... 'n':

    * M1: 6 tstates: acknowledge interrupt and decrement ... cycles:

    * M1: 6 tstates: acknowledge interrupt.
    * M2 ...
    Fraser Fraser July 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…

    ... to place an 8-bit vector on the bus. Presumably it does ... an instruction / vector on the data bus.

    I think the ... interrupt sequence (in IM0) is 6 cycles of interrupt acknowldge, during ... timing (some z80s may keep 6 cycle INTACKS, while the Mostek ...
    Alcoholics Anonymous Alcoholics Anonymous July 2004 Development
  • UlaI remplaced an ULA 6c001-6 by an ULA 6c001-7 chip on issue 3B board. It is "crucial" to remove R32 and adding the 2x NAND gates ??? or not ? Thanks.

    ... arm for one to fix Bit 6 on one of my Spectrums ... ...) I had to change the data bus resistors from 470ohm to 680ohm ... to stop data "leaking" from the lower bank ...
    Phu Phu June 2007 Hardware
  • Oneliner contestHello to you all, I dare you to make a program on 1 BASIC line. Here is the place to sent your ONELINERS [url]http://www.zxspectrum.00freehost.co…

    ... suffice.

    [quote]
    6. Instead of declaring a DIM ... a great way to avoid 'ear bit' problems!

    [quote]
    DATA statement carefully, a single POKE ...
    Digital Prawn Digital Prawn September 2007 Development
  • Look what I got!Look what I just got in the post: [url]http://www.alioth.net/tmp/W5100.jpg[/url] But, please... don't hold your breath :-) Coming to an edge connec…

    ... 8bit data line, /CS, /RD, /WR, /INT.

    6.2 Indirect Bus ... puts a byte on the data bus so it can run ... routine. So an extra bit of logic needs to be ... that is read, and bit 0 could represent ULA and ... bit 1 the CTC. Simple.
    ...
    LaesQ LaesQ October 2007 Hardware
  • Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…

    ... for testing upper RAM for data bit errors and addressing errors on ... got a speccy which where bit 6 (data bus)'s C000-DFFF address range ...
    BloodBaz BloodBaz January 2008 Hardware
  • Quick test (2)Could I ask any 128 / +2 / +2A / +3 owners to test the new version of [url=http://www.shadowmagic.org.uk/spectrum/fusetest.tap]fusetest[/url] on thei…

    ... for testing upper RAM for data bit errors and addressing errors on ... got a speccy which where bit 6 (data bus)'s C000-DFFF address range ...
    Marcelo Marcelo January 2008 Hardware
  • Running TZX off an IDE drive? Or streaming from a NAS?Hello. I know about the DivIDE project, and about the ZX Ethernet project, but not how far they've come or what they can do. So: 1. If I have a squ…

    ... connector, which functions a bit like ROMCS - you can ... expected input onto the data bus that is consistent for ... operation) and a little bit of glue logic hardware ... the state of the ear port, the right state ... onto the Spectrum's bus when the IN instruction ...
    Winston Winston September 2008 Hardware
  • 4116 DRAM for 48KSomeone told me I got faulty RAM in my broken 48K. They should be 150ns, right? What would be a good place to buy them from?

    [QUOTE=Phu;330293]CHANGE THE DATA BUS SEPARATOR RESISTORS.

    ... impedance somewhere - Making the data bus resistors a higher value (say ... dissapeared when I cooled a bit the ULA. It came that ... Replacing the ULA with a -6 model solved the snow problem ...
    mcleod_ideafix mcleod_ideafix January 2009 Hardware
  • 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…

    ... on the size of their data bus followed by the size of ... instructions. SISD (single instruction single data) and SIMD (single instruction multiple ... an 8 BIT addition creates one bit spare. The 9th BIT can be ... I can see, revision 1.6 is finished. See! if you ...
    ASM ASM October 2010 Chit chat
<1234567…34>

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