-
SCF/CCF flags - new discoveryI can't believe that no one is interested in discussing the additional, previously undocumented internal state of the Z80 CPU I have discovered recen…
... (see [url]http://www.z80.info/zip/ZilogProductSpecsDatabook129-143.pdf ... the P/V flag is reset. This bug can be ... /z88dk/z88dk/libsrc/_DEVELOPMENT/z80/z80/asm_z80_push_di.asm?revision=1. ... /z88dk/z88dk/libsrc/_DEVELOPMENT/z80/z80/asm_z80_pop_ei.asm?revision=1. ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... taken on pins of the Z80 CPU unless stated.
[IMG ... (pin 17), /HALT (pin 18 ), /RESET (pin 26), /BUSRQ (pin 25 ... be pulsing low.
Z80 CPU address lines A0 to ... generates DRAM refresh signals.
Z80 address lines A7 to A15 ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... taken on pins of the Z80 CPU unless stated.
[IMG ... (pin 17), /HALT (pin 18 ), /RESET (pin 26), /BUSRQ (pin 25 ... be pulsing low.
Z80 CPU address lines A0 to ... generates DRAM refresh signals.
Z80 address lines A7 to A15 ... -
Fixing my old ZX Spectrum 48K issue 4AHi Guys, I trying to fix my old Spectrum 48K. Looks like my dad used a wrong power supply as the ULA had a bit missing and so did the 7805. So I rep…
... taken on pins of the Z80 CPU unless stated.
[IMG ... (pin 17), /HALT (pin 18 ), /RESET (pin 26), /BUSRQ (pin 25 ... be pulsing low.
Z80 CPU address lines A0 to ... generates DRAM refresh signals.
Z80 address lines A7 to A15 ... -
A tally on the number of successful builds of the Harlequin[SIZE=4][COLOR=Green][U][B]A tally on the number of successful builds of the Harlequin.[/B][/U][/COLOR][/SIZE] Please post your successes below :-) …
... 2K14 works nicely with the Z80 CPU that comes free with ... /> Just need to shorten those reset pins to close the case ... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... bytes to setup the
Z80 PIO.
1. Set ... on the bus. If the Z80 is currently in IM2, it ... cause these bits to be reset
in error during a ... -
AMX mouse emulationI'm trying to add AMX mouse emulation to Spud but not getting very far. I can get a reaction to button presses but nothing to moving the mouse. …
... bytes to setup the
Z80 PIO.
1. Set ... on the bus. If the Z80 is currently in IM2, it ... cause these bits to be reset
in error during a ... -
New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…
... a pin-out of the Z80 CPU.
[IMG]https://farm8 ... the following pins of the Z80 CPU
16 /INT ...
25 /BUSRQ
26 /RESET
27 /M1
28 ... -
divMMC ENJOY wont work with 48+it works with my 48+ ver 6b with my 128+,my 128+2 128+2a 128+2b but not the ver 4 48+:confused:,the green light stays on the blue light never comes o…
... Spectrum ROM will cause the Z80 CPU to jump to address ... address that the Z80 CPU starts at when reset...
[B ... -
Issues with 48k spectrum and divIDEI heard you can have all kinds of issues with 48k spectrum and certain DivIDE models. Is this true and if so what should I look out for ? Only aski…
... button it worked like the reset. I did the "NEC ROM ... problem with the same CMOS Z80 CPU type (a different piece ... CMOS CPU with an NEC Z80 from another Spectrum, it worked ... -
Issues with 48k spectrum and divIDEI heard you can have all kinds of issues with 48k spectrum and certain DivIDE models. Is this true and if so what should I look out for ? Only aski…
... button it worked like the reset. I did the "NEC ROM ... problem with the same CMOS Z80 CPU type (a different piece ... CMOS CPU with an NEC Z80 from another Spectrum, it worked ... -
New user with a dead 48k issue 2Hello all I've found my way here from watching some excellent youtube videos by Joulesper Coulomb in an attempt to fix a issue 2 rubber key 48k I bo…
... sit down and test the Z80 with a scope.
26 RESET = flat signal 5v
27 ... -
Your Spectrum RegretsSpeccy things that you have done (or haven't done) and have regretted them since. Here's mine... (in no particular order). 1) Sold my Spectrum 128K…
1. Definitely should have tried to learn Z80 machine code.
2. Snapped the power cord when pulling it out in order to reset it. Which turned out to be the last time I used my Speccy.
3. Getting rid of my tape collection. -
Definitive list of games incompatible with +2A/+3 and of compatible versions (if any)I am trying to compile the definitive list of games which are incompatible with the +2A and the +3 and of their compatible versions, if they are pres…
... - Hit Squad
[*]Skyfox - Dro Soft (Spanish language). Note: jp provided ... Whirled: Corrupted graphics and system reset after game start. [URL="http ... Trooper: Corrupted graphics and system reset after game start. [URL="http ... -
Help with 128k greyHello friends, need some help here on try fixing a +2 grey spectrum128. To keep it short, opened the case and the voltage regulator was missing, the …
... repeating fixed patern, if you reset it start the test normaly ... 9 (data line 5) on Z80 measures 3.15v -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... the same guys doing the z80 did the 8080 they probably ... cpu will be held in reset while the FPGA configures so ... -
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…
... it without slowing down the z80 or suffering contention. I was ... exactly how mentioned earlier - before reset was de-asserted on the ... something to execute once the reset line was de-asserted. -
Please explain Spectrum FPGA-clones to meI've been using the great ZXDS-emulator on the DS XL so far, which is great. But I kinda missed toying around with hardware. I've tried bidding on a …
... /> ie: software running on a z80, (which is implemented on a ... /> IP is widely available as soft-cores now. This means you ... -
New multisystem floppy interface (spectrum 16Kb/+2A/CPC464)Dear all, I would like to show you my new extern floppy interface. Same interface can be used for both, CPC and Spectrum systems. CHARACTERISTICS …
... found a problem with the /RESET signal.
Seems ... to the spectrum bus and reset it continuously.
reset pin on the edge connector which is the z80 ... NRST, which Amstrad call RESET is the one that ... you saw it would reset the machine whenever the ... -
New multisystem floppy interface (spectrum 16Kb/+2A/CPC464)Dear all, I would like to show you my new extern floppy interface. Same interface can be used for both, CPC and Spectrum systems. CHARACTERISTICS …
... NRST to the Z80. (also fed to the RESET output on the ... -
+3e simple ide interfaceHi guys, I want to make a +3e with my +2a. I'm thinking of making the simple 8bit ide interface (internal) and connecting it to a 40 pin ide to sd r…
... the new files. I hit reset and tried again and this ... to load. I move a z80 file i made in fuse ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
As the Z80 is specified to clear the I register on RESET, testing ... way to distinguish between a RESET and a RST &00 ... NZ,NotAReset ; I0, not a RESET
LD A,&3F ... have tested implement a user reset as a JP &0000 ... -
RAND USR that doesn't work in emulators and clonesEons ago, I "discovered" a strange RANDOMIZE USR. This is it: [b]RANDOMIZE USR 46578[/b] Using it on a genuine ZX Spectrum rubber key or Plus model,…
... the Z80 is specified to clear the I register on RESET[/QUOTE ... is true for a normal reset, but not a special one ... have tested implement a user reset as a JP &0000 ... emulators that support the special reset, albeit without realising I suspect ... -
1985-2015.A topic where we can review games released on the Speccy 30 years ago, or, anyway, talk about that year.
... of the Spectrum reset gag, but because of the soft-hard nature ... -
ZXMAK2Hi everyone, I'm glad to present you the latest version of my emulator - ZXMAK2 :) There are a lot of changes were made since the last topic about t…
... />
[*] Some fixes for Z80 emulation (include reset behavior that discussed here ... -
ZXMAK2Hi everyone, I'm glad to present you the latest version of my emulator - ZXMAK2 :) There are a lot of changes were made since the last topic about t…
... the HDD emulation.
Fixed Z80 reset behavior.
Some fixes to ... -
What is the Sinclair ZX Spectrum Vega and what does it mean?Just stumbled upon this Indiegogo page following a tweet from SpeccyNews [url]https://www.indiegogo.com/projects/sinclair-zx-spectrum-vega[/url] it…
... case[/I] - on / off switch, reset button, and maybe 6 Mhz ... -
Testers for new z88dk clibA long (long, long, long) time ago a few people offered to help test the new clib in z88dk. Much time has passed since then and I won't hold people,…
... of the code it doesnt reset so maybe its not an ...
{
uint8_t jp; // 195 = z80 jump instruction
void *fzx_draw ... -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
... video it looks like the Z80 CPU is not running. What ... up.
Add a reset switch (temporary). Now when pressed ... clock input pin to the Z80 CPU.
Mark -
ZX Spectrum issue 6a - yellow border problem<p>Hello!</p><p>I have problem with my Sinclair ZX Spectrum issue 6A, 48K. </p><p>I have changed low memory (all 4116 IC's) and coil, all electrolyti…
@balfordChecked with 2 different working ROMs -> same result. Thanks.@1024MAKI will add reset and post result. I only have multimeter, but I think that I can find oscilloscope, and I will test clock on pin 6 of Z80. Thanks.
