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Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... OR gate to do the decoding (bits of the printed circuit ... -
Please explain how a Kempston interface circuit works.Can someone help me understand how a Kempston joystick interface works, as I want to design and build my own as an experiment. I understand switches…
... OR gate to do the decoding (bits of the printed circuit ... should be included in the decoding. /M1 is not needed if ... [/SIZE]
Includes address decoding details
Make: RAM ... -
Double-Buffer ScreenFor my Alien Breed Speccy re-write I decided to use a Double Buffer (DB) or 'Back Screen' to draw all the game action onto, before shuffling the whol…
... bit (bit 3) on port $7FFD. It's then a matter ... -
Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…
... easy way to improve the decoding of these RAM Mk2 interfaces ... -
Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…
Joystick Interfaces on +2AJust found out that my DK'Tronics joystick interface doesn't want to play with my +2A (black). The Kempston port works OK, but not the Sinclair port…
... 's just to improve the decoding on an old RAM interface ... I could completely replace the decoding part of the circuit. But ...DIY Issue 1 Internal 32K RAM expansionFollowing on from the information in [URL="http://www.worldofspectrum.org/forums/showthread.php?t=40173"]this[/URL] thread, I finally figured this ou…
... which is only used for decoding and should not go to ...Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... should be used for port decoding.
[QUOTE]And things ...Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... should be used for port decoding.[/quote]
The ports ... were chosen to allow partial decoding for Chris's plug-in ... plug-in version uses full decoding. There's no way to ...Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... were chosen to allow partial decoding for Chris's plug-in ... plug-in version uses full decoding. There's no way to ... contention, regardless of the port decoding chosen or anything else. Even ... /> Now I wonder what port decoding does Chris use... I should ...Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... contention, regardless of the port decoding chosen or anything else.[/quote ... ]Now I wonder what port decoding does Chris use... I should ... but originally he was just decoding the top two bits of ...Fuse 1.1.1 releasedOn behalf of the Fuse team, I am pleased to announce the 1.1.1 release of Fuse. The changes from the recent 1.1.0 are relatively minor, mostly correc…
... ULA+ implementations use different port decoding (full vs partial), then it ...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…
... other chips used in the decoding, control and address line multiplexing ...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…
... other chips used in the decoding, control and address line multiplexing ...RTC module for DIVIDE[IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_top.jpg[/IMG] [IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_bottom.jpg[/IMG] [IMG…
... connector with full 8bit address decoding and up to 3 fire ...Issue 4S bad M1Never ever seen a 4S with a bad M1 line before today [url=http://postimg.org/image/o2yrigdb1/][img]http://s14.postimg.org/o2yrigdb1/IMG_1291.jpg[/img…
... 74LS138 is used for address decoding.
[B][I]Mark ...Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]
... when reading from the port #7FFD in computers ZX Spectrum 128 ... the status of the port #7FFD. Jumper JP1 must be broken ...Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]
... last writed value from port #7FFD (return true value with original ...Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]
... last writed value from port #7FFD (return true value with original ... /> The ability to read port #7FFD is not the main thing ... the ability to read port #7FFD is already a bonus. :)Spectrum Plus display issueHi, does anyone know if this is fixable at all by someone with no experience? From looking on a similar post on World of Spectrum forum they mention…
... ULA chip with wrong memory decoding (generating wrong CS signals). That ...Upgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]
... think bit 5 of port #7ffd.)
HoodUpgrade ZX Spectrum 128,+2,+2a/b,+3[B]1. Debugging RD #7FFD ZX Spectrum 128,+2:[/B] [url]http://zx.clan.su/forum/8-121-1#795[/url]
... port is better than readable 7FFD + readable DFFD + readable 1FFD....
7FFD are also readable. We need ...128k Screen Flipping - Sample Code PleaseI know this has been covered before, but I cannot find out code to do the following: On a 128k Spectrum tell the speccy to display from address 4915…
loop:
ei
halt
page: ld a ,$17
xor $0A
ld (page+1),a
ld bc,$7FFD
out (c),a
...
do something with screen
...
jp loopCurrah ?Speech channelIt seems to me that it would be nice to be able to send words to the ?Speech with PRINT #5;"Speak English to me, Jimmy" or some such. There really i…
... might well preclude real time decoding of sentences even on PCs ...Fast and easy read/write of attributes?What are the fastest or easiest ways to check the attributes of tiles on the screen, in BASIC? It seems to be a great way of storing object info. …
... bits along the way, including decoding the PRINT separators; all (b ...ZXDS 1.3.0Hello, I am really glad I can announce one more [URL="http://zxds.raxoft.cz"]ZXDS release[/URL] on this special day. The major new feature is the lo…
... I started, too. The screen decoding required is much more complex ...What if Sinclair had released a 16 bit Spectrum?Had Sir Clive not wasted his companies money on the white elephant that was the C5 and instead focused on competing with his rival computer manufactu…
... Spectrum hardware (e.g. partial decoding of I/O) made using ...RTC module for DIVIDE[IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_top.jpg[/IMG] [IMG]http://velesoft.speccy.cz/other/rtc_module_v01_full_bottom.jpg[/IMG] [IMG…
... and J4 open) - 12bit address decoding (A15-A12 are ignored)
decoding
[B]#CxEF[/B] ( ... J4 closed) - full 16bit address decoding
Inhibit RTC chip (jumpers ... #1F with full 8bit address decoding (A7-A0=BIN 00011111) and ...Bomb Munchies - preview releaseBomb Munchies Preview release Version 12th Jan 2014 [URL=http://s979.photobucket.com/user/MatGubbins/media/bmsix_zpsc33279a2.gif.html][IMG]http://i…
... if you're doing full decoding, but reading it would clash ...Bomb Munchies - preview releaseBomb Munchies Preview release Version 12th Jan 2014 [URL=http://s979.photobucket.com/user/MatGubbins/media/bmsix_zpsc33279a2.gif.html][IMG]http://i…
... if you're doing full decoding, but reading it would clash ...
