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Why doesn't my loop work?Can anyone help me understand why my loop doesn't work? Is it to do with how DEC HL affects the flags? [code] ; Read 32k bytes from port 191 as fa…
... ]
On ZX48 or 128/+2(grey) exist contended and ... will contended (slow down by ULA). ULA stop CPU if adress bus ... -
Fully integrated ZX+Hi, I just want to show some inspiration for integration HW to ZX+ case ;-) - ZX48 issue 3 board, without all parts regarding video generating (pa…
- 48 to 128 rebuild (hw.speccy.cz)
< ... lower ram read by the ULA (Page 5 or 7 depending ... -
Speccy 128 Shadow screen.How much is the shadow screen used in 128k commercial software? I ask because I am looking at putting 128k of memory in the 48k setup I have been bu…
... , as I have a second ULA around which isnt doing anything ... now have a working Speccy 128 with switchable roms, with the ... -
Multiface 1 (Romantic Robot) RepairHello there my fellow ZX'ers! recently I got an Interface 1 + MicroDrive from a friend and since then I have been having awesome geeky moments in fr…
... repairs, alas one had suffered ULA death =(
However ... plasma.
Anyway, that 128+2 became the start of ... needs a membrane)
Spectrum 128 (I really like this toast ... of these now)
Spectrum 128 +2A (not functioning)
... -
Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
... 90% compatible with ZX128 / Pentagon 128,512,1MB
+ switch for ... external ram pages are fast (ULA no slow down CPU and ... -
Memory upgrade for ZX Spectrum 16/48This is external memory upgrade for ZX Spectrum models with 16kB ram. Can be connect also to 48kB models, but need remove 8 dram chips (from sockets …
... pages are fast memory and ula not slow down pages 1 ... ram and original BETA-DISC 128 with new TR-DOS rom ... -
+2 grey composite modWithout digging out the schematics, is it possible to do the composite mod like the 48k on these?
... writing now.
The ULA definitely has U, V, and ... only the 48k ULA, not the 128k ULAs - both 128/+2 nad ... -
+2 grey composite modWithout digging out the schematics, is it possible to do the composite mod like the 48k on these?
... only the 48k ULA, not the 128k ULAs - both 128/+2 nad ... -
+2 grey composite modWithout digging out the schematics, is it possible to do the composite mod like the 48k on these?
... ] a ZX+2 schematic. 128/+2 ULA has 48 pins, no free ... and +2 have the same ULA (DIP 48 pin). ZX+3 ... +2A/+2B have the same ULA (square, flat, surface mounted ... -
likely damage caused to +2 by too highly rated supplyHi. did have a quick search but couldn't see an answer. I've been offered a +2 which the previous owner damaged by connecting too high a power supply…
...
[B]The Spectrum 128 +2 (Grey model)[/B]
[B]The Spectrum 128 +2A/B (Black model)[/B ... , its possible that the ASIC ULA may be blown.... as such ... -
likely damage caused to +2 by too highly rated supplyHi. did have a quick search but couldn't see an answer. I've been offered a +2 which the previous owner damaged by connecting too high a power supply…
...
[B]The Spectrum 128 +2 (Grey model)[/B]
[B]The Spectrum 128 +2A/B (Black model)[/B ... , its possible that the ASIC ULA may be blown.... as such ... -
Minor Update to Gasman's Midi2BEEPDon't know whether this is worthy an announcement, but for those of you who enjoyed Gasman's midi2BEEP utility, a new variant has been made called mi…
... hardware as well as the 128 hardware, and one of ... /> out (c), e
out (ula), a
ret
[/code ... uses the partial decoding of 128 and the fact that the ... ports to write to the 128 and Timex register ports ... stack and sent to the 128's data port. The ... -
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…
... ]
[B]ZX Spectrum 128 (Toast Rack)[/B]
[code ... : 4B 8434 SCR168 / SCR166
ULA: FERRANTI 6C001E-7 8415
ULA: FERRANTI 6C00IE-7 8426
Amstrad Toast Rack?Hello there my fellow WoS'ers Recently I have been very lucky with my brother giving me a Sinclair Spectrum 128K+ (Toast Rack), it needed a little a…
... such thing as an Amstrad ULA. As I understand it the ... in place of the ULA in the 128. Thinking about it, I ... from the TC2068 to a 128 to get the extra video ... isn't handled by the ULA, so that could be an ...Amstrad Toast Rack?Hello there my fellow WoS'ers Recently I have been very lucky with my brother giving me a Sinclair Spectrum 128K+ (Toast Rack), it needed a little a…
... find one of these ASIC (ULA) from the TC2068.... I have ... easier to just do the 128 compatibility mod to a TC2068 ...So what is the best Spectrum?I've had a search and even though i can remember a similar thread somewhere I'll twist it a bit. Whats the best "unmodified" Spectrum? (modification…
... ) after the introduction of the 128 in 1985.
[quote ... for around 2 years. The 128 was on sale for less ... an obsolete dedicated part ... the ULA. Yes it's finally been ... of agree with you. The 128 was a machine created at ...Japan Tsunami AppealAs some of you will be aware, I've been tinkering with an open source version of SE Basic that could be distributed with hardware without infringing …
... the Timex ports or the 128 ports. Unfortunately Sinclair machines use ... is a write to the ULA. It just so happens that ... get a write to the ULA as well on Sinclair hardware ... /> out (c), e ;
out (ula), a ;[/code]
replace ...128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... known bug in the 128K ULA.
The 0xbffd test ... should be contended on a 128.... or is that the "bug ... pages are contended on the 128, whatever the manual might say ...128K Contention - How to get it right?With my recent hardware hackery, I've built a 128K (toastrack) clone. I can't quite get the contention right though. What I'm lack is a clear descri…
... known bug in the 128K ULA.[/quote]
For my ... it is high? (ie the 128 address decoding only considers A1 ...Sam Coupe clonesAnybody know of any Sam Coupe clones? If they are available, are their any available to buy at the moment? Should of posted this in hardware. Sorry,…
... clone. Architecture of SAM COUPE ula is not so hard. I ... (more than 128 colours)
- compatibility with Pentagon
- ula implemented in ...Spectrum 128k+ Toastrack lower Beeper level?Does anyone know the easiest way of matching the AY and beeper levels? I'm guessing perhaps the easiest thing to do is lower the beeper line rather t…
... a method of modifying the 128+ to lower the beeper level ... has the wrong number of ULA pins for a start.
ULA pins, complete with the route ... trace the output of the ULA and found it does go ...Greetings all overheat problemsfirstly hello everybody and thanks for adding me to the forum dont know if ill be much use here but i hope so the problem i have or should i say a…
... hot?
2. Check the ULA - is it getting hot?
128 +2, originally I suspect the ... , so I changed the CPU, ULA... and still I had no ...Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... with old ULA
OUT Linecounterport,128 = do interrupt after 128 lines was ...Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... with old ULA
OUT Linecounterport,128 = do interrupt after 128 lines was ...Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... /> [url]http://jbacteria.antoniovillena.es/128?hwscdemo.tap[/url]
2. The modification is ULA safe. So any old program ... /> 3. The changes in the ULA tend to be minimal, probably ... less FPGA space than in ULA+.
Of course this ...Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... /> [url]http://jbacteria.antoniovillena.es/128?hwscdemo.tap[/url]
2. The modification is ULA safe. So any old program ... /> 3. The changes in the ULA tend to be minimal, probably ... less FPGA space than in ULA+.
Of course this ...Add horizontal hardware scroll to ULA+In this case we must read a bit in the ULA+ for test if supported. And the future software that uses it must have to branch: 1. If hardware scroll i…
... based on the FPGA Spectrum 128 by Mike Stirling - which is ... plug-in replacement for the ULA as it would also have ... that could plug into the ULA socket, but that's a ...What paging scheme is the "standard" for 128K models?Sinclair implemented an arrangement so that even numbered pages are non-contended, and odd numbered pages are contended (quoting from memory, haven't…
... of 228 TStates. Same as 128 model, with which Inves were ... to probe anything on the "ULA" of this machine requires first ... figure out which signals this ULA generates and what pins they ...
