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The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... ROM and RAM banks have no fixed upper/lower position, ... The DISCiPLE ROM *and* RAM are both paged in upon ... addresses (although it's not clear whether these are ... at #0000 and the RAM at #2000 whenever the ... Writing to the port places RAM at #0000 and the ... -
The Disciple clone... doable?Hi. As a spectrum user in the 80's this was the dream interface all-in-one for me. I have a 48k+ and planning on get a 128K toast-rack later. Anyway…
... don't know what the upper half of any 16 ... a snapshot of the DISCiPLE RAM on one machine (such ... stored in the DISCiPLE RAM, but do not know this for ... would distrust anything in RAM relating to the contents ... snapshot of the DISCiPLE RAM that the DISCiPLE will ... -
Rocky Gush Floppy Drive InterfaceI have a Rocky Gush Floppy Drive Interface which I would like to post the details under the Hardware section of the website. What is correct procedur…
... they're all in the upper half of the ROM.[/ ... high whilst the FloppyOne's RAM is being accessed, presumably ... of the contents of the RAM of other peripherals.
... ROM from 0x0000?0x1fff, RAM from 0x3000?0x3fff, but ... paging logic, and am not sure if I ever will ... -
+2 grey Contended RAMhi all, i have some quenstions about, contended RAM are banks 1,3,5,7 banks are the pairs of IC's (4164), so 1 pairs = 16k X 4 pairs = 64k this 64…
... about,
contended RAM are banks 1,3,5 ... we have uncontended memory "upper" memory with the same ...
now psysical, contended RAM are the IC's on ... "64K x 1 Bit Dynamic RAM with Page mode". "The ... into banks. It is not as straightforward as pairs of ... -
Keyboard scanning routines / techniques?What keyboard scanning routines or techniques do people use? I'm looking to write something which doesn't rely on the ROM-based keyboard scanner, an…
... and keys with sym. Detected keys are mapped to key ... 3DOS into the Multiface 3 RAM, then modify it to ... current downed keys. If detected keys at next scan are ... would need 16 bytes of RAM somewhere, which isn't ... open, and skip if not. That leaves more processing ... -
Issue 3 board... How to resurrect?Dear Everyone, Now I have a working 48k Issue 3, a sort of working Speccy+ (still having problems with the keyboard, more of that in another post) a…
... the fact that I do not own a reliable oscilloscope ... supply out, it does not always imply that the power ... 16k by removing the upper 32k and support chips.< ... by taking out the upper memory chips and the ... does not start correctly with the suspect set of RAM chips ... -
Opus discovery problemTook delivery of another of these today, bad drives but I got one working, a further issue developed after I plugged a Multiface into the Opus's expa…
... border, also, it does not boot correctly with 128k machines ... copyright message with no keypresses detected.[/QUOTE]
Let ... exchange all socketed chips (EPROM, RAM, PIA, FDC) between the ... (125MHz version) and must not be substituted with a 74LS04 ... -
another faulty zx spectrum +2 to fix!!!Hello to all, I'm new here... I have got a faulty +2 (gray) and start to try fix it... I have read the treads of xaris_sm and Pluto63 as background…
... sold Emelio the 300ns ram chips, not thinking of the speed of ... /> And as the Z80 and upper memory control logic (40058 / PCF1306 ... />
I'm not an expert in RAM timings though, so does ... anyone know the minimum RAM speed to be used? 500ns ... -
Which ULA?Just a quick question, more of interest rather than immediate need... I am thinking ahead about the repair of an Issue 2 board, and also an Issue 6A …
... none of the lower RAM chips are heating up ... , the ROM, the RAM combined that process keyboard inputs ... okay :)
Not a ULA fault :)
Not a membrane fault ... joints for them are not likely based on 5 ... ]
[*]to disable the "upper" 32K if fitted and try ... -
Games/Programs making use of DivIDE featuresHello :) I have a question: I may be wrong, but it looks like the DivIDE and similar interfaces for the ZX Spectrum are almost exclusively used for …
... =Alcoholics Anonymous;712817]Contiki is not trying to be a complete ... i/o model but may not be available on all systems ... take up a lot of ram (the fragmentation is a nightmare ... -
The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... .
Removed all lower RAM since it was soldered to ... a few of the elecrolytics, not all, and gave the whole ... see if I have an upper memory problem also. I shall ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... if the signal is marginal, not sure as I grew up ... />
[LIST]
[*]Having an upper/lower T-state bound for ... pilot/data edge can be detected - this might help with noise ... latest code (and that might not be much use given how ... -
Experimenting with turboloadersHello, My first post, having lurked here for a while. I'm a lifelong computer nerd, Spectrum fan since childhood in the eighties, and have recently…
... if the signal is marginal, not sure as I grew up ... .
[QUOTE]Having an upper/lower T-state bound for ... pilot/data edge can be detected - this might help with noise ... working due to the pilot not being detected.
But, perhaps ... -
Scrolling by 2 pixelsWhat is the fastest way of scrolling a Spectrum screen line by 2 pixels left or right? When thinking about it I've come to this simple solution: [C…
... you keep your program in upper 32K there will be no ... you scroll your pixel in upper 32K memory... and if you ... , it would take 15T + 15T (not counting the extra time needed ... store operation on the contended RAM.
Instead, [URL="http ... -
Corrupt paper on zx spectrum 48kHi. When I power up my spectrum (issue 3) I get the light grey border, but the paper is black and it switches between thin red vertical lines and thi…
... /infoseekid.cgi?id=1000328"]RAM Turbo interface[/URL] with ... Sinclair/Interface2/Cartridges/Interface2_RC_New_RAM_Tester.htm"]RAM test program[/URL].
... stock, as these have not been made for many years ... />
If the upper 32k of RAM is suspected, you can ... -
Old homemade hardware?Hey there, I've been given a bunch of ZX Spectrum stuff, I've mostly fixed the computer, just need a membrane. But what I was wondering is that there…
... :
[LIST]
[*]Program not loading correctly, causing errors which ... (either the 16k "lower" RAM) or...
[*]"Upper" (as in the top ... BASIC program to test the RAM next.
[I][B ... -
Wanted: broken motherboard!Does anyone have a motherboard for a 48k (any issue) that is currently not working? I'm looking to set up a test board for chips, and would like to g…
... issue) that is currently not working? I'm looking ... a board that is not working, for a reasonable ... on them already: after testing ram, Z80, ula, power ... etc.
So that is not what you want ;)
... when you want to test upper memory (4164) chips, you ... -
Manic Miner ZX81Hi Guys, Can anyone explain why [url=http://www.worldofspectrum.org/infoseekid.cgi?id=0017539]Manic Miner ZX81[/url] is not able to reproduce the ex…
... original built-in static 1K RAM only (without a 16K standard ... RAM expansion) is supposed to support ... and a call to upper memory. This is not different in the ... -
New multi-interface for ZXI have in development new interface for ZX Spectrum. PCB size is similar as K-MOUSE interface and on board is CPLD (programmable logic), up to 1MB st…
... joystick (with a random upper address byte) doesn't ... interface, but (I think) not the BETA one the Russians ... an Interface II or a RAM Turbo. It would usually ... part of the keyboard, not just the Sinclair/number ... the through-port of the RAM turbo, such that any ... -
Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
... the lower 16k are not modified in any way.
not used, those pins could ... the address multiplexers for the upper 32k. These shouldn't ... is done in the two upper left chips, the ones ... link when they installed the RAM sockets. The fact that ... -
Copy 4Kb in Assembly?Here's an interesting problem: what's the best way to copy a block of 4Kb in assembly? The most obvious solution is to use [B]LDIR[/B]: [CODE] l…
... timing critical code in uncontended RAM? :)
[quote]In a ... code just because 4096 is not a multiple of 20, otherwise ... talking about writing to contended RAM then hopefully we're talking ... using [B]LDI[/B] during upper border scan, and some variant ... -
Issue 3 board with strange piggy-back boardIn case you are interested. I?ve never seen something like this before. I have an Issue 3 board here. When I opened the case and found a strange pig…
... , I removed the chips from upper 32k and I also removed ... now time to change lower ram.
To be honest I ... it finally running. I do not want to destroy my own ... helpful to figure out which Ram chip is broken to avoid ... -
First time capacitor replacementHi, I have an Issue 2 board, that i wish to start with recapping as advised on here, as they look to be all original. (Same with V3 board, but going…
... fitting sockets would [U][B]not[/B][/U] be my next ... way to disable the "upper" 32k of RAM (The whole thread starts ... /> Is the ULA not socketed then :-o (not that it makes much ... (yours is okay) or a RAM chip that has failed.
Collision Detection in SP1Hi, Does anyone have a well-documented example of using collision detection in spritelib. I've search WoS and Z88DK forums but no joy. Something wi…
... dec a ; do not count blank column on ... dec a ; do not count blank column on ... nc, nocollision ; if not, no collision is detected
... hl = 1 to indicate collision detected
#endasm ...Born again Speccy user with problemsHello all, Firstly I'd like to say a big hello - this is my first post! When I was 8 or 9 or so my dad bought a ZX Spectrum 48K and a whole bunch o…
... - I eagerly await your upper and lower RAM modules!
About ... measly 0.06 V rms - not the 2.7 V that ... use. I suppose it's not meant to power anything other ... decided to test whether or not the speccy speaker worked during ...The Spectrum Resuscitation ThreadKicking off this thread as a place where people who are fixing/restoring Spectrums (or indeed any other piece of related hardware) can show off their…
... , it's different but still not quite what were after. At ... 4116 chips, hoping I had not burned them already.
RAM socket joints and changed the upper memory RAM chips and ... AmiBay and Zetr0! I could not have done it without your ...Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... than the 16K ULA/RAM address space? If not done at its ... writes.
If not, a simple cross-over of ... thinking that writes to the upper 8K of ROM are intended ... for the lower 8K of RAM and accept them into ... its video RAM, at least for a ...Totally random idea for the hardware nuts to exploreWhen it comes to multi-player games, how hard would it be to generate a second display from a single Speccy, instead of trying to link up machines, s…
... .
I've not even considered putting it into ... />
[QUOTE]If not, a simple cross-over of ... thinking that writes to the upper 8K of ROM are ... for the lower 8K of RAM and accept them into ... its video RAM, at least for a ...Plea for new hardwareI'm posting this as a poll as I want to judge if I'm a solo loon going on about this, or if people really are interested in either of the following S…
... lower to the upper 8K half of the contended RAM then that ... use that as an excuse not to at least try
