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LDIR timings in contended RAM?The 48K Spectrum technical reference page ([URL="http://www.worldofspectrum.org/faq/reference/48kreference.htm"]here[/URL]) describes the detailed ti…
... note is that contended memory is not actually contended until the ULA ... screen rendering immediately after a HALT you can reduce the contention ... -
What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... 2
ei
Forever halt
jp Forever
ret ... : a program running in contended memory, writting to contended memory (or at ... we calculated for a non contended behaviour.
The RAM ... -
28-character wide multicolour(ish) on 48k SpectrumLong-time lurker here... I've always been interested in rainbow effects on the 48k Spectrum, mainly from a perspective of "Just what [I]would [/I]ha…
... using LD a,(22528 ) --a contended instruction to keep everything in ... trivial to lost sync, because HALT is a serie of NOP ... on machine state, but a contended instruction makes it on sync ... better to use a long contended instruction now and then to ... -
BorderTron 3000A little bit of speccy-related fun for a Friday afternoon... I've knocked together a program for Windows which I've called Bordertron 3000 (a suitabl…
[QUOTE=gasman;619256] A HALT instruction (assuming that's how ... normalized by a contended instruction used in a contended cycle. This will ... -
Spectrum30 Show in Cambridge, 08th-09th September 2012Hello Spectrum-fans, after many months of preparation we now proudly present what will be the biggest Spectrum venue of the last 20 years. We manage…
... the odd 4 cycles a HALT could end on. I can ... part of that will be contended. I wonder if it's ... my copying to do a HALT so that the second pass ... and timing everything with EI/HALT, so I'll try it ... have to stop, do a HALT, then resume.
You ... -
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…
... ,5 and 7 are all contended. Expect an extra delay of ... or executing code in a contended bank, your execution time will ... running under interrupt or uses HALT (which probably rules out all ... /> IO port $fe is also contended, but I'll leave that ... -
FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... especially when executing and accessing contended memory. Nowadays, I expect a ... need to be in ROM, HALT would prevent debugging IM2 dependent ... gdb-z80-stub to use HALT command for breakpoint and ... with another instruction (such as HALT) as there is for ... -
FUSE serial communication sample anyone?Hi, in [URL="http://manpages.ubuntu.com/manpages/precise/man1/fuse.1.html"]FUSE man pages[/URL] one finds switches for serial comms. By using --inte…
... , especially when executing and accessing contended memory. Nowadays, I expect a ... with another instruction (such as HALT) as there is for ROM ... -
Address bus contents (i.e. PC) during execution of HALTI'm wondering if anyone can tell me what's placed on the address bus during execution of HALT, beyond the initial M1 cycle. The Z80 user manual state…
... has to point after the HALT, as otherwise when the ... implicit NOP executed after a HALT until the interrupt is acknowledged ... of entropy and executes from contended memory, incorrect emulation of this ... [I]to[/I] the HALT instruction, then an interrupt handler ... -
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…
... the trick is to use HALT to wait for an interrupt ... you whether the RAM was contended (slowed down) or not.
So do a HALT, read a byte from 23672 ... -
Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…
... too and all the messy contended memory and clock halting stuff ... a DMA to contended RAM? does the ULA halt the CPU clock ... -
Tinkering with DMASo, some afternoon tinkering... [img]http://photo.alioth.net/tmp/dma_small.jpg[/img] The purpose of this all is to see what's possible using the Xi…
... a DMA to contended RAM? does the ULA halt the CPU clock ... -
New game: SETO TAISHO VS YOKAIHello Spec-chums! At last, my new game is available for download: [img]http://www.alessandrogrussu.it/zx/Seto-art.jpg[/img] [b]Features:[/b]…
... joystick later (in screen time/contended ula time) then on D5 ... data bits.
EI
HALT ;time after INT/begin of ... -
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... the check right after a HALT instruction you should get a ... think that HALT can be avoided by using contended port for Kempston ... -
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... the check right after a HALT instruction you should get a ... think that HALT can be avoided by using contended port for Kempston ... you mean something else by contended port?
Also, there ... -
Double Buffering Artefacts on Real HardwareI have a project that I've played around with for a while and always tested using emulators, either ZX Spin or Spectaculator. It is a 128k game th…
... think that HALT can be avoided by using contended port for Kempston ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... an interrupt doing a HALT in the contended memory area, which works ... -
Need help from people with a +2A/+3Started a topic [url="https://www.worldofspectrum.org/forums/discussion/55141/need-help-from-people-with-a-2a-3"]here[/url] to get a broader reach, b…
... might still be just the contended pages that influence this. ... but is in fact the contended memory page 4. Moreover, ... test uses just one HALT while the main test ... some delay between the HALT and reading the fb ... I've fixed the HALT issue with the memory test ... -
Detecting +3 / +2AWhat's a simple but reliable way to detect if code is running on a +2A/+3? My first though was to try switching to ROM2 and then checking for the …
... code:
[code]
halt ;wait for top border
contended RAM on the bus
contended[/i] RAM, and the value ...
