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Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…
... terminal marked NC in the schematic when the button is not ... -
Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…
... a NMI. Here is a schematic:
[url]http://www ... -
Trying to create NMI, whats this switch?Hi, I have been reading a book Z80 Applications, and I am trying to create a simple device for creating a NMI. Here is a schematic: [url]http://www…
... multiple NMI's. Now, this schematic is out of a "Z80 ... -
Speccy 128 QuestionMainly for the experienced speccy resurecters around these parts. Have you ever had a Speccy 128 with a borked TEA2000 video chip? The reason I ask…
... the right place in the schematic. There has to be a ... depends on version of the schematic, I mean the last transistor ... -
ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…
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I could post a schematic to overcome this problem f ... -
ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…
[QUOTE=ingo;221446]Yes, that's it but Tom-Cat is also right:
I could post a schematic to overcome this problem f you like.
Ingo.[/QUOTE]
If you can, that would be very helpful. Thanks. -
ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…
ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…
[QUOTE=ingo;221486]I placed a possible schematic on my home page
( [url]http://www.truppel-online.de/[/url] [/QUOTE]
I don't think this works because "I" input is in TTL level. With diodes and resistors, the "1" value will be very low.ZX Spectrum +2 RGB to CGA (RGBI) MonitorI just picked up a spanking brand new Goldstar 1410-CGA with RGBI. It has a 9 pin "D" type connector. 1 Ground 2 Ground 3 Red 4 Green 5 Blue 6 Inte…
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I corrected the schematic - only 1 resistor is neccessary ... really 5V but in original schematic the level is also the ...About the edge connector (reset and comp video)Recently aquired a Kempston type interface for my rubber keyed 48K. Ive been wanting to add a composite video out and it just occured to me i might …
... transistors but has a simple schematic I think (no special IC ... be worth to analyze the schematic (unfortunately I actually don't ...Zx Spectrum +2 Datacorder - Discman To Car Cassette Tape AdapterHas anyone tried using a discman to cassette adapter on a ZX Spectrum +2 datacorder and loaded games with a CD or direct from a PC Soundcard?
... /> I ust looked at the schematic of +2. I think it ...About the edge connector (reset and comp video)Recently aquired a Kempston type interface for my rubber keyed 48K. Ive been wanting to add a composite video out and it just occured to me i might …
... transistors but has a simple schematic I think (no special IC ...Testing the Ram on a Toastrack 128KHi All My "new" 128K is misbehaving, all the demos I have loaded for it crash instantly, Ghostbusters 128K is playable but one of the background scr…
... the memory of a 128k (toastrack or +2 grey) the only ...Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... .
Here's a schematic of a relatively simple add ...Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... ? If so is there a schematic anywhere?
I would ... bits from one port adress. Schematic is not very complicated - only ... Port 31 (Kempston) a simple schematic is here:
[url ...Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... off! Looking at the Kempston schematic, which still looks complicated to ...Input/Output on Edge ConnectorI would like to sense a pulse on the data bus via the edge connector, i.e. on or off. How do you decide what port it is on? I would also like to send…
... '138 part in that kempston schematic posted) or for a full ...Gamasutra article on the er.. other computer.I know that some of you own and love the c64 (heretics!). This article may probably interest you: [url]http://www.gamasutra.com/view/feature/1991/a_…
... (2 rubber, 1 48K+, 1 toastrack 128 ), a half working Spectrum ...ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... looking at an issue 2 schematic, if your spectrum has R57 ...ULA RAS, CAS cycles, refresh and "snow effect"Hello everyone. I have a question, does anyone observed timings of RAS and CAS generated from ULA? I think there may be answer to where the "snow ef…
... looking at an issue 2 schematic, if your spectrum has R57 ...Post a pic of your desktopI am sure it has been done before, but here is mine: [url=http://img99.imageshack.us/my.php?image=desktoptt4.jpg][img=http://img99.imageshack.us/img…
... key model and the 128K toastrack. They're hosted on the ...Post a pic of your desktopI am sure it has been done before, but here is mine: [url=http://img99.imageshack.us/my.php?image=desktoptt4.jpg][img=http://img99.imageshack.us/img…
... key model and the 128K toastrack. They're hosted on the ...divIDE woesHi y'all ! Last night I built my lovely divIDE ;-) I downloaded flasher and +divide.tap from [url]http://www.biehold.nl/rudy/+divide/index.htm[/url…
... ;-) )
I've got the schematic here in front of me ...Spectrum ethernet... step 1.1Yeah, a tenth of a step :-) Here's the W5100 board up and WORKING: [url]http://www.alioth.net/tmp/w5100-online.jpg[/url] This is called the "Get Th…
A prototype was yet made by "Speccy do it yourself" and this is the schematic:
[url]http://zxspectrum.hal.varese.it/ethernet.jpg[/url]
the "only" way to do: to write a device driver!!!!!!!!!!!How does the Z80 work internaly?How does the Z80 work internaly, i.e. how does it actually execute a machine code instruction? When it fetches a byte from the memory and finds, for…
[QUOTE=Rickard;229390]
how does the CPU at a low level know what to do and how does it execute this?[/QUOTE]
This is done by its internal schematic, completely on hardware level. There's no lower-level microcode in the Z80.Floppy Drive on +DHello, I have unfortunately no old drive left, but want run my +D. Problem is that newer drives has no switch anymore for choosing between drive 1 an…
... as i remember from the schematic), you may always hook it ...New tape releases - 128K only?As Jon's new Egg-Head game is 128K only, and splATTR has also evolved into a 128K only game - both due to memory constraints - I was wondering if the…
... a few ways, and the toastrack 128k's ROM has some ...New tape releases - 128K only?As Jon's new Egg-Head game is 128K only, and splATTR has also evolved into a 128K only game - both due to memory constraints - I was wondering if the…
... a few ways, and the toastrack 128k's ROM has some ...New tape releases - 128K only?As Jon's new Egg-Head game is 128K only, and splATTR has also evolved into a 128K only game - both due to memory constraints - I was wondering if the…
... BASin doesn't emulate the toastrack for its 128k features, you ...Speccy plus composite modHi folks, I have 2 48K speccy plus machines both with really poor RF output, one is very weak and the other wanders and white tears across the scree…
... would like to see the schematic for it.:wink: