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Help with dead Spectrum +2aHello. My Spectrum +2a died some time ago. It was powered on, I looked away and next time I looked at it, screen was black. I have replaced the 4 r…
... to test with it.
How do I change ULA on ... have one. I assume the ULA is just a chip on ... -
Help! +3 won't work anymore!I've just set up my old +3 and it just won't work - it used to a few months ago but now it won't :( I'm in need of some expert help so here's the pr…
... myself think it is either ULA (you cannot replace easily) or ... I don't want to test it. I have tried to ... -
Help! +3 won't work anymore!I've just set up my old +3 and it just won't work - it used to a few months ago but now it won't :( I'm in need of some expert help so here's the pr…
... front of me on the test bench.
The keyboard ... the modulator - thing about the ULA is that even when it ... />
If it IS the ULA, you may as well get ... changing/sourcing the surface mount ULA isn't gonna be easy ... -
Help with +3 in comaHi everyone Had a spectrum +3 under the bed for some time and when replacing its drive i accidentally connected the 5v and the gnd of the led. Now…
... . I asked a friend to test the diodes and they are ... haunt me. Guess its the ula :(
It will be ... or +3 to replace the ula so i guess im giving ... -
ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... be a good test.
RAM works. Memory test is fine... just ... to all memory addresses?
ULA works as this isn't ... -
ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... it might be a "weak" ULA in the ZX81 that is ... rampack. I will try and test with other ZX81 or other ... -
ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... possible it's a dead ULA....
But if that ... the RAM work whenever we test it?
2) Why does ... -
ZX-81 Ram Pack problemHi! I know this is a ZX Spectrum forum, but I am hoping someone here might be able to help me out... I have posted this to c.s.s. but noone was able…
... it is and try and test the RamPack on another ZX81 ... my ZX81. It seems the ULA in the ZX81 might not ... and not really a broken ULA) - so it might work with ... some other RamPack. OR - the ULA in the RamPack (or the ... -
48k spectrum, video problems help neededHi All, I have been browsing this site for a long time and today i have finally registered and am after some help!! I have a 48k speccy and the vid…
... option A and buy a ULA from you. Thinking about it ... this?
For another test i tried was to load ... on tape so for the test what i did was to ... -
How do you get an external tape recorder to work on a +2a?Just for the hell of it, just say the internal cassette player stopped working. What command would you use when hooking up an external player, so the…
... : GND, PLAY, +5V, REC and TEST.
DO NOT ... AND YOU WILL FRY YOUR ULA. I WILL TAKE NO BLAME ... way, you will blow the ULA. If the REC connection gets ... connected to the mic, the ULA will blow. I'm not ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... ]
This is the test program's implicit memory allocation ... implicitly.
In this test program, only SP1 will be ... system? Nothing usually, but the ULA is generating an interrupt each ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
The next test program is going ...
On the Spectrum, the ULA generates a maskable interrupt at ... not straightforward however. The ULA was not designed to ... (I*256+256) the ULA interrupt will cause our subroutine ... id associated with the ULA as random. We fill ... -
ANN: SP1 for Z88DK (aka splib3, Sprite Pack v3.0)Well it's finally arrived, after a month of "a few days from now" release deadlines. SP1 is the lastest version of splib, a flicker-free software sp…
... to field interrupts from the ULA:
[code]
#asm ... following sequence will occur: the ULA interrupts and supplies a random ... interrupts).
The next test program will show these ideas ... -
The New SPIN releases ThreadOk, as I'm now working on SPIN again full-time, and as a very wise man once said, "Release Early, Release Often"[1]... I'm going to release new SPIN…
Well, here it is - SPIN Test Release 11.
Grab ... reasonable approximation of the ULA Snow.
ULA Snow has been ... -
RealXThis may be a dumb question but will RealX ever get released?
... a good understanding of how ULA snow really works. And ... 0x40-0x7F then the ULA gets confused by the ... that the address the ULA uses to build up ... A8 = A15-A8 of the ULA address
A7-A0 = ...
We cannot obviously test RealSpec's snow effect as ... -
RealXThis may be a dumb question but will RealX ever get released?
... incorrectly that the address the ULA uses to build up the ... addressed.
We cannot obviously test RealSpec's snow effect as ... is none, but we did test the "snow contention", and you ... -
Spectrum 128+2Greetings to all My Speccy Tape Drive has died. Fully blown :( Is there any way to hook up a external cassete player to the +2? I can't see any "lin…
... /> +5V
REC
TEST
You can ignore ... the +5V and test for now but the + ... INPUT, you WILL fry the ULA chip. This is a ... . Get it wrong and the ULA will fry
... buy various plugs, sockets and test meters from. As fast as ... -
RealXThis may be a dumb question but will RealX ever get released?
... discovered has revealed how the ULA snow works, which is ... for determining where the ULA reads display/attr bytes ... We have a number of test programs that Realspec fails on ... you'll be able to test RealSpec with them.
... to know about the ULA!
D ... -
Spectrum 128+2Greetings to all My Speccy Tape Drive has died. Fully blown :( Is there any way to hook up a external cassete player to the +2? I can't see any "lin…
... is GND, bottom pin is TEST.
PLAY is an ... visa versa) will fry the ULA/Gate Array chip. -
Spectrum won't load data when warmI've got an interesting observation. I put iPodLinux onto my iPod and got TZX files playing back as the proper audio waveform. I also removed the vol…
... nightmarish predictions of a faulty ULA chip and in the end ... headphones - be careful when you test it. Turn the volume pot ... -
The 128 plus 2 wasn't very goodHaving looked at the review in issue 33 of Crash of the Spectrum Plus 2, it strikes me as a bit odd, as if Simon Goodwin had to like it. I remember r…
... a major redesign of the ULA and without some extra CPU ... new graphics... since the Timex ULA with the extra graphics was ... time to do a new ULA. There's no way they ... haven't even tried to test it yet. -
Election of the new maintainer of the TZX formatHi folks, the topic says all, let the discussion begin :) Luca
... don't have time to test every possible combination of hardware ... is perfectly available from the ULA, and some loaders will use ... -
Election of the new maintainer of the TZX formatHi folks, the topic says all, let the discussion begin :) Luca
... don't have time to test every possible combination of hardware ... is perfectly available from the ULA, and some loaders will use ... -
Speccy dead? :-(I've been playing around with my Speccy and a Discovery disc drive unit, and tried to do the NMI modification to allow a multiface to be plugged into…
... me to test. Possible problems include ROM/RAM/Z80?ULA. Assuming you ... -
Nooooo my speccy died!??!!Hi! I am quite sad. :( Tonight I got a kempston interface so I rushed home to try it on my spectrum+ The edge connector of the interface was narrower…
... thing I would do is test the ULA. Then take voltage readings ... the RAM. If good, then test the 4116 RAM chips, then ... -
Nooooo my speccy died!??!!Hi! I am quite sad. :( Tonight I got a kempston interface so I rushed home to try it on my spectrum+ The edge connector of the interface was narrower…
... 40%
ROM 40%
ULA 10%
I know ... fixed them, always changed the ULA then checked the voltages present ... voltages are present, change the ULA and test the computer. It may ... , the cause being a damaged ULA. Unlikely but possible.
Nooooo my speccy died!??!!Hi! I am quite sad. :( Tonight I got a kempston interface so I rushed home to try it on my spectrum+ The edge connector of the interface was narrower…
... , all pass the test in the hardware checking tape (ULA, ROM, RAM ...zx81I have one ZX81 computer here at home which was given to me today. I?ve never had a ZX81 before and therefore have know nothing about it :) The thin…
... problems are possibly a bad ULA or Memory (maybe even a ... of known good components to test against.
MikeWFrom a book about commodore.."In April 1982, Sinclair released an improved computer called the ZX Spectrum. Compared to the C64, the Spectrum had few technical advantages. It ha…
... , fire off another sample run, test the chips and repeat until ... as well, called the ULA. The ULA is a sea-of-gates ... with a colour framebuffer. The ULA integrates some stuff that could ...Spectrum Issue two problemI managed to bring back to life a issue two spectrum (at least the power supply cirquit). The screen is now crystal clear (after replacing all the el…
... , CPU, and most of the ULA [I]should[/I] check.
test RAM) or even the EPROM ...
