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ZX Spectrum keyboards : all and everything about them and how can the Speccy keyboard be improved? This discussion can include of all the main types of Spectrum keyboard from the past (inc addon / aftermarket) , their strengths and weaknesses , …
... each of the upper address lines (A8 to A15) pulls ... pressed, one of these lines gets connected to one of ... five ULA keyboard input lines via the five way ... connector. These five input lines each have a 10k pull ... plus keyboard, a slightly lower value is used for some ... -
Replacing lower RAM 4116 ZX Spectrum 48k - desoldering advice please?A long post, but interesting pictures perhaps. :) I'd like some advice: (also apologies I think I picked the wrong 'Hardware' category for this, plea…
... top of capacitors, and the lower lead links to a pad ... and the voltages on the lower ICs (still) being good, I ... appearing black horizontal 1 pixel lines across the screen.
ZX Spectrum +3 repairI have my first +3 here, and it needs repairs. Hoping someone here can help me out. When I power it on I get this screen with black and white line…
... +3 as it has a lower current output. What I've ... visible as very thin whitish lines around the outlines of the ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... as a map of which lines to mask or ignore
cp e ;upper or lower line?
ld e,a ... address
and 20h ;odd lines
add a,e ;
Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... as a map of which lines to mask or ignore
cp e ;upper or lower line?
ld e,a ... address
and 20h ;odd lines
add a,e ;
Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... as a map of which lines to mask or ignore
cp e ;upper or lower line?
ld e,a ...I feel like such a moron having to post this but stillI started out to write a simple cursor move program to demonstrate how easy it is to program in Basic! Hah, serves me right. I started by setting…
... but Basin won't accept lines 100 or 102 as written ... I change the letters to lower case it does or if ... does?
Wont accept lines 105 - 130 either
Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... as a map of which lines to mask or ignore
cp e ;upper or lower line?
ld e,a ...I feel like such a moron having to post this but stillI started out to write a simple cursor move program to demonstrate how easy it is to program in Basic! Hah, serves me right. I started by setting…
... but Basin won't accept lines 100 or 102 as written ... I change the letters to lower case it does or if ... does?
Wont accept lines 105 - 130 either
lines. What a plonker, still the ...48k packed up after cap changeHi all, I'm relatively new to the Sinclair world, my 8-bit repairs in past was lurking in the dark sides of Acorn, Amstrad and Commodore! I've got…
... board are all in the lower RAM area, which had been ... interfere with the data bus lines - perhaps I should also remove ...Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
... ’s the matter of applying color attributes. I also use the ... manually adjusted to make sure lines don’t begin with spaces ...Nasty vertical pattern on a 128K Toast Rack via RGBI managed to fix the busted membrane on my [url="https://www.worldofspectrum.org/forums/discussion/55755/got-myself-a-128k-toast-rack-plus-a-simple-a…
... of the TEA2000 chip. The color ghosting should disappear almost completely ... to stay dark (like thin lines) also get bombarded by “stray ...Timex Sinclair palette in FUSE?Does FUSE support the Timex Sinclair colour palette? I've tried running appropriate software and rom but the palette stays the same as the Ferranti U…
... voltage for V is slightly lower - but these values are all ... version for V on +V lines is very slightly different from ... version for V on -V lines - but this difference is smaller ...Faulty ZX Spectrum 48kHi guys, I just got around to doing a composite mod on an old ZX Spectrum 48k that I got from Ebay a while back. It did say it was untested and b…
... with checking all power supply lines (+12V, -5V and +5V). I ... ; C55 (large electrolytic capacitors between "lower" and "upper" RAM chips) in ...Faulty ZX Spectrum 48kHi guys, I just got around to doing a composite mod on an old ZX Spectrum 48k that I got from Ebay a while back. It did say it was untested and b…
... with checking all power supply lines (+12V, -5V and +5V). I ... ; C55 (large electrolytic capacitors between "lower" and "upper" RAM chips) in ...Alternative to Poke 23659,0 to prevent a 'break in' to a Basic Program.Good morning everyone, My memory fails me these days but in the early days of programming I used to use Poke 23659,0 as a crude way of offering so…
... contains the number of lines in the lower section of the screen ... can use the whole 24 lines of the screen, the ... that we must ensure the lower part of the screen ... PRINT on the bottom two lines it is usually better ... scroll up the top 14 lines of the screen only.< ...ZX Spectrum colour palette - Equivalent 8-bit RGB values?I'm wishing to do some ZX Spectrum games screenshots on my Mac, but cannot find any information on the net which states what the equivalent 8-bit RGB…
... voltage for V is slightly lower - but these values are all ... version for V on +V lines is very slightly different from ... version for V on -V lines - but this difference is smaller ...What's the correct Spectrum colour palette?Prompted by the recent SCR-to-GIF conversion thread, I was pondering writing one in Z80 assembler. As I did a LZW compression routine a while ago tha…
... voltage for V is slightly lower - but these values are all ... version for V on +V lines is very slightly different from ... version for V on -V lines - but this difference is smaller ...Tutorial - learn machine code in 30mins[B][I]Message from the moderators[/I] - bigjon has requested that readers' attention be drawn to a better version of this tutorial, one which is easi…
... ORG 30000 which is 3000 lower and everything works. As I ... memory so I needed to lower this???
3) ENT ... Manual.
4) Zeus lines are numbered. The code shown ...ZX-Uno moddingStarting with ZX-Uno case modding I have not yet received my ZX-Uno yet (it is in the post) but I know that I will have to do at least one mod …
... , scandoublers and different numbers of lines into the mix. This is ... status bar in the upper/lower border, to maximise the playing ...Fixing a poorly Issue 3 - Odd faults.Here's one for you Spectrum fixers, I warn you it's a long one. I've spent a couple hours this evening doing several repairs on a rubber keyed Speccy…
... . I removed all the old lower ram ic's and fitted ... no shorts. Fitted a spare lower ram module and was greeted ... area, and thin vertical red lines. Now I'm not sure ... . Might have to buy more lower ram ic's, or another ...Cubic RevealI just though I'd develop this a little further. Written a while ago on a whim! [img]https://dl.dropbox.com/s/p44y5dda49ucmop/square_reveal_1_1.gi…
... as a map of which lines to mask or ignore
lower into H
ld b ... the ATTRs address INC & lower CHR line
ld e ...New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... much.
Changing upper and lower memory ICs for SRAM modules ... I understand what those green lines meant :) So, you have a ...Spectrum 48K / composite mod / LCD TV: voltages out of the ULAHello Spectrum World I have juste bought again my first computer on ebay... a Speccy 48k issue 2 with a 5C112E-2 ULA. Just had to replace TR4 and …
... ] it would imply suppressing the color bursts during vertical sync, making ... convert some top and bottom lines of the border into sync ...Printing text, part MMXIIXI'm pretty sure there's been a zillion threads about this already, and I don't think it's the first one by myself either, but here goes. Proportiona…
... return, end of string, text color, and paragraph indentation. (Obviously, it ... , each character occupies only 7 lines, with one byte reserved for ...Proportional-width fontsFor reasons that are still not quite clear to me (because I’ve always loved typography and design,) I never bothered to write a proportional-font rou…
... codes: paragraph indent and text color.
[code]
; ... br /> cp $c ;is it color?
jp nz,not_control_code ;no ... /> pop hl ;fetch next byte (color attr itself)
ld a ... we're only drawing 7 lines
inc e ;next ...help with issue 3 48k speccy after recap and new tr4 and tr5I have a 48K speccy that was not working. After recapping and replacing TR4 and TR5 it came back to life However after a short while running weird …
I'd suspect the lower RAM chips first - obviously check ... would be the Z80 data lines are being messed up by ... you can still get a lower RAM board, but that may ... good way forward if indeed lower RAM is to blame, those ...New video about S-video modification on Issue two 48K Spectrum.I just finished an s-video modification on an Issue two 48K Spectrum so I made a video about it. Most of the technical details are in the video; if y…
... 41256 DRAMs are used as lower/upper RAM, 7805 has been ... 'm more concerned about the color space for the moment.
