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Spectrum screen layoutSeeing the thread on displacement I was wondering why the spectrum had the stupid screen split into three sections and the addresses for each section…
... same region of memory or not.
When drawing the ... the 16K of contended RAM and an upper half containing optional 32K ... to vary. Seven bits are not enough to enumerate scanlines (0 ... memory. Since the display is not generated during the border and ... -
UDG tricks?I always enjoyed using [URL="http://www.worldofspectrum.org/ZXBasicManual/zxmanchap14.html"]UDGs [/URL]for the 'sprites' in my games, when I coded th…
... system variable to change banks, not both bytes.
Replacing ... ROM character set somewhere in RAM, then change the system variable ... can always re-define the upper-case letters and numbers to ... ATTR or data poked into RAM to remember what's where ... -
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…
... ;772417]I have sold the RAM modules on eBay, but haven ... with a missing IC12 will not damage anything ?
System ... will not work without this chip I ... /> Any modules to replace the upper memory ?
Thanks all ... -
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…
... CK signal is at the upper limit of the "acceptable level ... inverter gates, so they are not suffering from such problems as ... power. My laboratory power supply detected the overcurrent, but it can ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... not run hot. At this stage, we don't need the "upper ... " 32k of RAM.
[B][I ... -
ZX Spectrum 48K AV IssueOK so I dugout my old 48K Speccy today and decided to AV mod it. I did the mod (pretty easy) but the picture I am getting is this. [url=http://posti…
... A7 is not floating (and limiting the the ram to ... = GND
4164: Pin1 = Not conn, Pin8 = +5V, Pin9= ... is connected to the "Not connected" pin of the ... The +12V is not connected to the ram at all, as ...
If the upper 32K is also 4164 ram, then this spectrum ... -
Spectrum Serial Numbers Wanted!![b]This post updated Sept. 26, 2013[/b] As far as I know, the serial numbering system for the Spectrum has never been fully worked out. For the p…
... reg (de-sw050), no heatsink, ram modules (upper & lower), ULA 6C001E7 ... backplate.
I've not come across the serial on ... -
Introduce yourself[SIZE=3][FONT=Comic Sans MS]This is the thread to stop by & introduce yourself.[/FONT][/SIZE]
... than 20!), but despite not being alive during the 80s ... of the Spectrum was not a great one, since ... it did not work properly. Unsurprising really ... to a modern TV. Not masses compared to some ... RAM chips. There's still 1 faulty chip in the upper ... -
Spectrum sometimes boots with graphic issuesA while ago, my Spectrum 48K (issue 3B) broke down after fiddling with a brand new joystick interface in combination with DivIDE. Today I tested the …
... to affect a whole byte, not a single bit. You might ... lower RAM chips.
One of your reboots show that upper ... -
Issue 6 repair with a twist...(Starting with a slight grump - the forum ate my first attempt at this so this'll probably end up being a bit terse :)) I got a Issue 6 48K machine …
... implemented. The walking bit does not make much sense when using ... versions using 8 bit wide RAM where it may be helpful ... is written it could be detected or not by happenstance. That has ... price that an error is detected not with every run but that ...
