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ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…
... everything in it (ROM, RAM, ULA etc.)...so only needs voltage ... -
ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…
... :
FPGA: EP1C6T144C8 (Z80, ULA, Joystick)
Flash: 512KByte 29LV400TC ... -
ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…
... /> [quote]
FPGA: EP1C6T144C8 (Z80, ULA, Joystick)
Flash: 512KByte 29LV400TC ... -
ZX in FPGA...Hmm..seems nobody is interested in a replacement PCB with FPGA...well..heading towards next FPGA projects then...C64 and others (o; [ This Messag…
... that. Just interesting in your ULA replacement.
Not sure ... -
Hardware section....Wonder why here is no specific hardware forum??? No one ever touched a soldering iron here? (o; I'm kinda lost here with my hardware stuff under: "…
It is FPGA based (o;
Though there is some ULA schematic out there using normal TTL chips.... -
Hardware section....Wonder why here is no specific hardware forum??? No one ever touched a soldering iron here? (o; I'm kinda lost here with my hardware stuff under: "…
3. Here's the ULA schematic:
[url="http://www.womoteam.de/english/Hardware/ZX_Spectrum/ZX_Layouts/body_zx_layouts_0.html"]http://www.womoteam.de/english/Hardware/ZX_Spectrum/ZX_Layouts/body_zx_layouts_0.html[/url] -
Hardware section....Wonder why here is no specific hardware forum??? No one ever touched a soldering iron here? (o; I'm kinda lost here with my hardware stuff under: "…
... ;
Though there is some ULA schematic out there using normal ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... * How long does the 48K ULA hold /INT low?
* ... this is generated by the ULA every 69888 tstates, which ... When an interrupt occurs, the ULA pulls the /INT pin ... routine finishes before the ULA has pulled /INT high ... finished just as the ULA pulled /INT low, ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... the routine finishes before the ULA has pulled /INT high again ... interrupt finished just as the ULA pulled /INT low, the EI ... -
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
InterruptsA small piece intended for the FAQ. Comments, corrections, additions welcome. Notably: * How long does the 48K ULA hold /INT low? * What happens i…
... no use for ending the ULA generated interrupt by RETI.
Mysterious bit of codeHi everyone, I found the follow piece of code in a game and was wondering what it does. ld bc,40ffh ld e,40h loop ld a,r …
Waits until the screen or attribute byte being read by the ULA for display is equal to 64.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…
... is higher complexity in the ULA while generating the TV picture ...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…
... have been nice if the ULA had a software-controlled switch ... optimiesd) you would like the ULA to use.
_________________ ...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…
... these lines should allow the ULA to walk through the video ... software-controlled switch in the ULA might be a nice thing ...2 questions regarding partial port decoding1) What happens if the Spectrum reads from a port whose number matches the criteria for more than one device ? Does only one of the devices get to r…
... /> On the Spectrum, though, the ULA is decoupled from the Z80 ... will always win against the ULA. Mileage will vary with different ...EmuZWin 2.5.0.1Version 2.5 Release 1.0 (10-Jun-2004): a lot of changes and fixes in ??? Map Builder ??? GFX Editor ??? Loading & Saving ??? Sound & Video ?? Speed…
... . A small bug produced some ULA snow (I can't believe ...Replacement chipsAfter much digging around on here, it seems to be the general consensus that the ULA could be causing the problems im having (spectrum is deaf to the…
yes, i tried the ULA chips in both boards with ...Starion Countdown in emulatorsThe Starion coundown is only fully visable in Real Spectrum (dos 376, 308 86Hz)
... exactly the same. Maybe a ULA problem?
[url="http ...Starion Countdown in emulatorsThe Starion coundown is only fully visable in Real Spectrum (dos 376, 308 86Hz)
And in Fuse (0.7.0) as well.
I'm not sure it's really a "ULA bug" that it doesn't work on the 128K; the timings are just different and Starion doesn't account for that.Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... ) is displayed on TV], the ULA(?) generates a interrupt and is ...Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... is halted sometimes, as the ULA needs to access the video ... CPU halted?
Does the ULA introduce delay cycles while the ...Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... don't remember exact number), ULA starts draw sequence: left border ... , not left/right border) ULA try read memory page (16384 ... about 80%).
when finished ULA draws bottom part of border ... of screen (TIME: cca 70000t) ULA generates signal and repeat this ...Interrupts details questionSuppose I am writing a game and I want to use interrupts to measure time, draw the screen without flicker, maybe to poll keyboard etc. What kinds of …
... />
[/quote]
The ULA is responsible for generating the ... access the same memory the ULA needs to access to ... stopping its clock while the ULA performs its access. After the ... region where the z80 and ULA might simultaneously access is called ...can I ear the loading sound while loadind a .tzx in zx 32?can I ear the loading sound while loadind a .tzx in zx 32? if so please tell me how tanx
... way of accuracy for z80/ula contention (it barely renders a ...Spectrum not booting up properlyI picked up an old Spectrum from a car boot sale today, but the keyboard was acting up. I took it apart to see what the problem was, but after puttin…
I'm not an expert but it I reckin the ULA is knackered.
This can happen by fiddling with the power supply, I speak from experience...On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... T states spent by the ula drawing borders before the byte ...On 48k, can I copy 4k before next screen updateFollowing on from my thread at [url="http://www.worldofspectrum.org/forums/viewtopic.php?topic=6423&forum=11"]http://www.worldofspectrum.org/forums/v…
... AA says just wait until ULA start drawing pixel part of ... is way how recognize if ULA is drawing border or pixels ...Wanted: Code to wait until Border has been drawnWhen my IM2 interrupt fires, I want to wait until the ULA is past the first line of display before drawing. I know I need to wait about 14300T after…
... is pulled low by the ULA 14336 (on the 48K machine ...Why relativly bad colour on Spec compared to other 8bit?Why relatively bad colour on Spec compared to other 8-bit machines like the Master system or even c64? I understand the 8x8 block that you could hav…
The PC-Engine had several other processers working PURELY just to output graphics and sound. The Spectrum had it's Z80 CPU, the ULA and a Beeper. THis is where the differences lie.
