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PlusD Mini: implementing the CPLDI am doing my first attempts on creating a CPLD to use as replacement for the PlusD's GAL (and other logic lateron). I use the Xilinx XC9500XL series…
... are the result of executing opcode 0xFF (RST 0x38 ) continuously. Which ... took a look at the PlusD schematic.
The GAL or ... the paging led on the PlusD is constantly flickering, it is ... -
Emulation and Debugging functionality[Cut n Paste from the original CSS post] Hi all, I'm currently working on SPIN's debugger, which is coming along nicely. Mostly, it's been devel…
... before or after the current opcode, which
allows any debugging ... -
Short Z80 QuizQ1) Which program gives different result ? A) XOR A ADD A,A B) XOR A ADC A,A C) SCF ADD A,A D) SCF ADC A,A Q2) What is the equivalent of NEG …
... is the slowest 1 byte Opcode (10 Bonuspoints if you find ... -
Z80 opcode breakdownAnyone knows if there's a document on the net covering all the Z80 instruction breakdown by machine cycles? All I could find was that one on the Z80…
Anyone knows if there's a document on the net covering all the Z80 instruction breakdown by machine cycles?
All I could find was that one on the Z80 support page and the CSS Faq, but I'm sure they're quite wrong in many cases.
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ANN: Issue 9 of Sam Revival magazine out now (Sam Coupe)Issue nine of Sam Revival magazine is out now, and this issue features the first cover disk! The magazine starts off with the usual Quazar News, as…
... quirk in an undocumented Z80 opcode in a newer revision of ... -
ANN: SpecEmu 2.3 - Minor UpdateHere's a minor update to the SpecEmu emulator - the emulator with an incredibly small filesize for a Win32 application, and backed up with an incredi…
... :
- Fixes to some overlooked opcode contention timings.
- Improved floating ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... /> Internally, the Z80 divides every opcode into M-cycles; each M ... /> * M1: 4 tstates: read the opcode (0x34).
* M2: 4 tstates ... bus value (0xff), coincidentally the opcode for RST 38, so the ... data bus means a random opcode could be executed, which makes ... -
Techy Z80 questions****** Question 1 ****** Take the instruction SET b, (HL). This is broken down (in machine cycles) as follows (according to Microprocessor Technolo…
... (4T) [i.e. the actual opcode]
M2: MemoryRead(4T)
opcode that would have followed the ... -
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…
... assembler, capable of assembling every opcode supported by the z80. Supports ... -
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…
... assembler, capable of assembling every opcode supported by the z80. Supports ... -
Machine Code QuestionHi All Not sure if this is the right place for this but it seems closest. Am starting to read the Toni Baker Intro to Machine Code book and its ver…
... the book plus the relevant Opcode listings...
Is Assembly ... -
Zilog Z80 ManualI'm looking at the zilog manual at the moment. (A pdf one), whilst trying to implement a basic emu, just for learning. Are there known to be many e…
... )10110rrr is the opcode, but i've got opcode AF (XOR A ... -
Emulators on a ZX Spectrum sectionIsn't it time to mention the emulators ON the ZX Spectrum in a special session. I know of 4 emulators for the ZX Spectrum right now: 1) ZX81EMUL (h…
... /coding/corewars/corewartutor.pdf+redcode+opcode&hl=nl&gl ... -
divIDE ProductionJust to let everyone know that we have made further progress with the updated divIDE. Board design has been completed and changes have been made to …
... we can get both the PlusD and divIDE to work together ... -
PlusD MGT formatBefore I have to write something half-arsed and rubbish - Are their any utilities for viewing and editing .MGT images, both headers, (cat entries), …
Before I have to write something half-arsed and rubbish -
Are their any utilities for viewing and editing .MGT images, both headers, (cat entries), and data?
Cheers -
Displaying registersHi I'm currently writing a Spectrum emulator, bacically to learn and see if I can =) I would like to test my functions before I continue, is there an…
... run the ADD a,s opcode and se in what way ... -
Sam Revival Back Issue Bonanza!As a special offer throughout March, i'm giving 25% off back issues of Sam Revival magazine. So if you are looking to fill in gaps in your collection…
Question For The Emulator AuthorsWhy do $ED $44, $ED $4C, $ED $54, $ED $5C, $ED $64, $ED $6C, $ED $74, $ED $7C all disassemble to opcode NEG and $ED $45, $ED $55, $ED $5D, $ED $65, …
... , $ED $7C all disassemble to opcode NEG and $ED $45, $ED ... combinations should disassemble to each opcode?
Interesting stuff this ...MGT Lifetime Drive CableHmm I have some PlusD interfaces, and one MGT lifetime drive - alas I am lacking the cable to connect the two. Does anyone have one lying around or …
Hmm I have some PlusD interfaces, and one MGT lifetime drive - alas I am lacking the cable to connect the two. Does anyone have one lying around or possibly the pinouts so someone could make me the cable?
RichMEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... of the DD/FD/CB opcode ranges, and may be of ...Undocumented DD opcodesHi, I'm emulating the DD-prefixed opcodes at the moment. What happens to an undocumented DD opcode - Phil's test suite doesn't test them. For insta…
... happens to an undocumented DD opcode - Phil's test suite doesn ...BASin Assembler suggestionsHi Dunny. According to your former request here goes a few suggestions. Been playing around with the Assembler and I'm glad I did. Quite nice indeed…
... ]
[*]A column displaying the opcode of each instruction as its ...New Spectrum Computer DevelopmentHey does anyone know of any decent new Spectrum clones being developed? I find it amazing how Zilog still produce a Z80 backwards compatible chip (an…
... wait states and fetching an opcode, and at the equivalent of ...need MF128 ROM for use with PlusD interfacedoes anyone have this ROM? Can they read out the ROM as I want to use my Not The Plus D interface with a multiface 128. thanks in advance if anyone c…
does anyone have this ROM?
Can they read out the ROM as I want to use my Not The Plus D interface with a multiface 128.
thanks in advance if anyone can help.How to use MGT disks on the emulatorDear readers, you may think I'm a bit silly, but I can't get the emulator (Spectaculator for instance) working with MGT image files. I have had a r…
... /> I have had a real PlusD drive in the past, and ...
