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Face-Off: ZX Spectrum vs. Commodore 64I found an old oldish, but very informed and interesting article on the ole Spectrum vs. Commodore 64 argument. The article explains the technical d…
... to Tyche; a bug-fixed machine with uncontended RAM and a floppy ... -
Ben Heck modifies a Zee X Spectrum.Gahh, one of the differences between Americans and Europeans right there in the title. Anyway, we know better ;) ...and this isn't about that anyway.…
... an improved emulation of the paging hardware that the 128K implemented ... of chips needed to implement RAM. He may built what we ... -
ZX81 ULA questionRecently, I got a nice bundle of kit comprising of a ZX81, Memotech keyboard, PSU and brand new 16K Sinclair Memory pack. The ZX81 has a ULA with no…
... ROM, CPU ,ULA(excluding internal ram of course) The later issue ... errors rather just a SQRT bug and the hardware workaround found ... -
Wanted: ZX81 caseJust found my old Issue one ZX81, ULA type 8120 (no other markings on the chip). Looking for a case to put it in and hopefully restore to full worki…
... with the floating point DIV bug, which whilst not serious in ... , which kind of surprises me. RAM is a single MOSTEK chip ... job, a 16K (or better) RAM pack and that's about ... -
Noob repairs of an S2 and S6AI received two Spectrums a Series 2 and a Series 6A both of which are not working. I don't know anything about electronics so thought my lad and I wo…
... 11 of the Z80. The bug was not fixed in future ... generation circuitry and the lower RAM can be damaged if this ... -
ZX81 and Analogue TVsI recently bought a really nice ZX81 on ebay in amazing condition, but I'm having issues tuning in an old analogue TV to lock onto the signal. I und…
... less common to find the RAM chip(s) socketed.
Three different RAM chip types were used. Timex ... single 24-pin 2k byte RAM chip. ZX81s had either two ... ” or “new” ROM) corrects this bug. However, the mathematical routines are ... -
48k Stops loading and resetsI've just fixed the problem I had with my Issue 2 Spectrum only showing 16k memory by replacing all of the upper ram. With that job done I've done a …
... test program says it is paging in the Spectrum ROM, but ... helpful in fixing Spectrums with RAM problems.
Now I ... -
48k Stops loading and resetsI've just fixed the problem I had with my Issue 2 Spectrum only showing 16k memory by replacing all of the upper ram. With that job done I've done a …
... test program says it is paging in the Spectrum ROM, but ... helpful in fixing Spectrums with RAM problems.[/QUOTE]
Hmmm ... last night without noticing any paging issues.
You can ... -
LOAD "" CODE in machine code/store 128 bank dataHow do you LOAD "" CODE from machine code? I have written the following MC routine that fits into a REM statement in a basic program. I want to cal…
... disabled
; page BASIC + RAM 6
ld a,$16 ... 1366
; page BASIC + RAM 0
ld a,$10 ... , if you need to change paging, remember to update BANKM or ... -
LOAD "" CODE in machine code/store 128 bank dataHow do you LOAD "" CODE from machine code? I have written the following MC routine that fits into a REM statement in a basic program. I want to cal…
... until RAM is changed). The OUT changes the paging, so ... only the OUT to change paging, forget about it. ... doing things on the wrong RAM page.
- After ... configuration: that is BASIC ROM + RAM 0 (16).
- Remember ... load data on RAM 5 or RAM 7. RAM 5 is ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... 0 if you want uncontended ram at 0xC000. (or do model ... loader to use a different paging scheme on different models!) -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... 0 if you want uncontended ram at 0xC000. (or do model ... loader to use a different paging scheme on different models!)[/QUOTE ... -
Weird symptom number 2...I got a new keyboard membrane for my Spectrum+ plugged it in and low and behold the weird left to right printing of the copyright message disappeared…
... CPU fault or a weird RAM fault, the only other things ... port communications (this fixes a bug in all Spectrum ULA's ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... model by testing the paging and has no side ... really matter if all the RAM is uncontended anyway!).
... to determine whether a RAM bank was contended though ... a counter in the RAM bank to test until ... interrupt triggers. If the ram is uncontended you will ... -
Banked memory running slower?I've just compiled a TAP which includes bank6, it loads ok, but the routines that are paged in run slightly slower. The Z80 snapshot has no such pro…
... to determine whether a RAM bank was contended though ... a counter in the RAM bank to test until ... interrupt triggers. If the ram is uncontended you will ... +2A/+3 from the paging model should be less ... Although if you are testing paging model instead of testing page ... -
+2b borkedwell not completely I get this when I hit the NMI on my multiface 3 (so that negates the use of my divides too), the yellow/green stripes flash [IM…
Mmmmm..... could be a paging issue: for whatever reason, the ... Divide and will check its RAM and ROM. What do you ... -
+2b borkedwell not completely I get this when I hit the NMI on my multiface 3 (so that negates the use of my divides too), the yellow/green stripes flash [IM…
... ;801308]Mmmmm..... could be a paging issue: for whatever reason, the ... Divide and will check its RAM and ROM. What do you ... -
Multi Multiface: the projectI posted some updates on Facebook yesterday about the development of the Multi Multiface, but here is the right place to share all technical findings…
... can be used different memory paging. For example it can work ... interface, rom interface, universal rom/ram expansion, rtc module, D/A ... -
+2 DIAGNOSTICSIs there a diagnostics test available for the spectrum 128 (+2) in tzx format? I've just obtained a spectrum +2 Grey and all looks fine with it on f…
... RAM test on startup checks all 16K memory banks by paging them ... follows:
; ---------------
; Fatal RAM Error
; ---------------
; Set the ... found faulty:
; RAM bank 7 - Black.
; RAM bank 6 - White ... -
Monkey Island On Speccy...I would love to see Monkey Island on the speccy...think it can be done...not as much detail or graphics...but along the same story lines.... What ot…
... /> My design is simple. ROM paging uses $0000..$3FFF address range ... -$FFFF is the computer standard RAM. It remains unmodified.
RAM (if you use a 48Kb ... -
Patching RST routines?Hi all, I am quite unexperienced regarding the Speccy and today I made another attempt to make a concept for a SymbOS port to this machine. There is…
... , which have additional paging modes that allow RAM to be paged in ... emulator uses the special paging mode to have RAM pages 0/1 ... -
New MEMFACE projectMEMFACE is my old project, but never finished. Now is PCB done (at the post office) and I write firmware for CPLD. MEMFACE is interface with external…
... ,n
16kB rom/ram switching in ZX rom area ... 8kB blocks, each with own paging port. Any of 8kB block ... can be rom or ram page. Access to full 512kB ... -
New Game - When Alex Didn't Do ItHello everyone, and a Happy New Year for 2015. After 6 months of toil, I've finished my graphic adventure, When Alex Didn't Do It, which consists of…
... provide a well thought and bug free game (sooo much debugging ... around 200 bytes of free RAM left over, even after using ... -
New Game - When Alex Didn't Do ItHello everyone, and a Happy New Year for 2015. After 6 months of toil, I've finished my graphic adventure, When Alex Didn't Do It, which consists of…
... provide a well thought and bug free game (sooo much debugging ... around 200 bytes of free RAM left over, even after using ... -
Newbie with a faultHi all just joined after digging my spectrum out of the loft after 30 years, it was put up there because it had a common fault I remember from back i…
... internal power supply failure (the RAM chips that provide the lower ... or more of the lower RAM chips (these are at the ... ones. A modern replacement lower RAM board is also available if ... repair service for reasonable money (paging Spirantho!)
B -
Best 128 K games?Hello All, Inspired by the "Showing off the Spectrum" thread, I was wondering what games show off the 128 the best? (NOT including the +3).
... great but for the tape bug out where one of the ... saved and loaded from the ram disk. NO IT'S A ... -
Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …
... />
To elaborate further, the paging model is a little bit ... />
A fault with one RAM chip in contended memory will ... affect all uncontended pages. Uncontended RAM is held in IC's ... -
Spectrum +2 (grey) RAM issueHi, I?ve got a ZX Spectrum +2 (grey) with what I think is a RAM issue. I used to be able to load games very reliably by playing converted TAPs and …
... /> So... does this mean the RAM is definitely perfectly fine? If ... there likely to be a bug with the Divide2k14 diagnostic firmware ... -
Back to basicsOK, having had enough of constant moaning about the look of the forums, I have done what I was going to do first time - because I am right, and am al…
... , unless it is a style bug, then there are no intentions ... something techical like handling 128K RAM switching and so on (which ...
