Search found 988 matches
- Mon Dec 14, 2009 9:53 pm
- Forum: Hardware
- Topic: 32k 62256 mem mod help
- Replies: 24
- Views: 37958
Re: 32k 62256 mem mod help
Hi Mike, you could use the ram-test routine of the rom itself: when you switch on the Zeddy the rom tests the ram from 16K to 32K and sets RAMTOP above the last ram adress (normally 32K). But it does not test above 32K, so even if you have 32K ram installed, only 16K is tested after power-on. It you...
- Sun Dec 13, 2009 6:29 pm
- Forum: Development
- Topic: BIN2P + other utils for compiling - Where?
- Replies: 4
- Views: 5254
Re: BIN2P + other utils for compiling - Where?
Here it is (coming with z88dk)
HTH Siggi
HTH Siggi
- Sun Dec 13, 2009 11:07 am
- Forum: Development
- Topic: BIN2P + other utils for compiling - Where?
- Replies: 4
- Views: 5254
Re: BIN2P + other utils for compiling - Where?
I recommend to use a C-compiler like z88dk to make programs for a Zeddy. This compiler uses libraries adapted for the ZX81 and knows about the ZX81's special hardware/interrupt features (e. g. that the IX and IY register are used by the NMI-routine are not saved on stack, so they may not be used by ...
- Sun Dec 13, 2009 10:23 am
- Forum: ZX BASIC
- Topic: Basic RAM limites.
- Replies: 4
- Views: 7346
Re: Basic RAM limites.
The D-File can be above 32K, if you don't have a /M1-circuit (to execute m/c above 32K) installed or have it disabled. But it cannot go above 48K, because the memory logic would (during display and /M1 active) redirect access from the D-File to the 16K range and then the Zeddy would crash, because t...
- Mon Dec 07, 2009 4:52 pm
- Forum: Hardware
- Topic: Back to memories.
- Replies: 3
- Views: 6692
Re: Back to memories.
Hi! I plan to install the RomCs decoder. But, there's something wrong. There is a RomCs on the zx81's edge connector. Where is it located? After the R28 resistor (Rom side) or before (ULA) ? After the resistor (Rom side) This resistor seem to be used to pull down the ROMCS to 0v on the edge conecto...
- Mon Nov 23, 2009 9:13 am
- Forum: Emulators
- Topic: EightyOne - time to bring it up to date?
- Replies: 17
- Views: 24654
Re: EightyOne - time to bring it up to date?
In the last millenium I wrote a game to simulate a nuclear power plant (Harrisburg :mrgreen: ). To control the reactor, you have to press 2 keys simultaneously . E. g. to open the valve for the steam, you have to press "D" and "K" (for '+') or "D" and "L" (for '-') to close it. I PEEKed some BASIC ...
- Fri Nov 20, 2009 9:49 am
- Forum: Emulators
- Topic: EightyOne - time to bring it up to date?
- Replies: 17
- Views: 24654
Re: EightyOne - time to bring it up to date?
Hi Dominique at least using BASIC it is possible to check multi-keypresses with EO (despite of the limited capabilities of a PC compared to a ZX81 :lol: ). In the last millenium I wrote a game to simulate a nuclear power plant (Harrisburg :mrgreen: ). To control the reactor, you have to press 2 keys...
- Wed Nov 18, 2009 10:35 pm
- Forum: Software
- Topic: SYNCWARS16 (By FRED. NACHBAUR)
- Replies: 3
- Views: 9434
- Tue Nov 10, 2009 2:03 pm
- Forum: Hardware
- Topic: SAVING sound?????
- Replies: 5
- Views: 5231
Re: SAVING sound?????
Are they? MIC = audio OUT (for SAVE programs) EAR = audio IN (for LOAD programs) Yes. For details about "mic" and "line" input levels: see http://harada-sound.com/sound/handbook/input.html So your tape deck should have a "mic" level input, otherwise you would need an additional preamplifier. Siggi
- Thu Nov 05, 2009 4:20 pm
- Forum: Development
- Topic: CODING COMPO: make a ZX81 1K demo!! :)
- Replies: 20
- Views: 15879
Re: CODING COMPO: make a ZX81 1K demo!! :)
Doesn't work on emul (I'm at wotk, at the moment). I will check it out in the evening. AKAIK: works with some emuls Does it require any hardware midifications? No Anyway it's not i BASIC, so cannot "compete". ;) This time at least. ;) The main work (drawing circles) is done by a BASIC program. Only...