Search found 5120 matches
- Sat Nov 19, 2011 6:46 pm
- Forum: Software
- Topic: Battery backed up 8K to 16K area
- Replies: 160
- Views: 60876
Re: Battery backed up 8K to 16K area
Are you going to use Z80 I/O addressing or are you going to use memory mapped addressing (so that PEEK and POKE can be used)? One of the annoying things about computers and hex is that different systems use different symbols to represent hex :evil: When I first saw things like 0x56 I was confused :?...
- Sat Nov 19, 2011 5:06 pm
- Forum: ZX BASIC
- Topic: Benchmarks on microcomputers
- Replies: 2
- Views: 5319
Re: Benchmarks on microcomputers
Interesting :D I'm not that surprised that a ZX81 running in FAST mode just beats a 48K ZX Spectrum. The BASIC in the Spectrum is a development and extension of the ZX81 BASIC and on a real machine the first 16k of RAM on the Spectrum is affected by the ULA "pausing" the Z80 MPU so that the display ...
- Sat Nov 19, 2011 4:51 am
- Forum: Software
- Topic: Battery backed up 8K to 16K area
- Replies: 160
- Views: 60876
Re: Battery backed up 8K to 16K area
Can you say $77 another way? Is there a decimal equivalent? In my world there is a binary address. I set my decoder to enable a chip at a certain address in binary and then a write signal pops out the data that a Poke made. I think there is another GAP in my understanding! 77 hex = 119 dec = 011101...
- Tue Nov 15, 2011 5:49 pm
- Forum: Hardware
- Topic: ZX81 keyboard repair (ribbon replacement)
- Replies: 10
- Views: 10963
Re: ZX81 keyboard repair (ribbon replacement)
I repaired one of my ZX81's several years ago, and it is still working perfectly, despite having been taken apart many times. The keyboard had stopped working due to a cracked connector cable. Here is how I repaired it... http://zx80.netai.net/zx81/ZX81KBRepair.htm Regards. Grant. :idea: Now where ...
- Tue Nov 15, 2011 3:37 pm
- Forum: Hardware
- Topic: ZX81 failing the pressure test?
- Replies: 4
- Views: 3137
Re: ZX81 failing the pressure test?
Of the eBay bought 8 bit machines (not just ZX81's) that I have obtained I have noticed the following as common problems: Keyboard problems - membrane broken or non-functional keys :( , Tarnished connectors (e.g. expansion edge connector) - cleaning normally fixes this :D , Intermittent faults with ...
- Tue Nov 15, 2011 3:17 pm
- Forum: GAMES
- Topic: DISASTER HAS STRUCK : My USB is unreadable.
- Replies: 25
- Views: 14868
Re: DISASTER HAS STRUCK : My USB is unreadable.
One thing I learned about computers way back when, is to always have at least one back-up copy... Of course despite knowing this, I still sometimes end up losing items that are a work in progress :cry: (a lot of the time as I am thinking, I'll just make this change then save a copy, then crash :o :s...
- Sun Nov 13, 2011 8:34 pm
- Forum: SALES
- Topic: ZX81 extender board for development
- Replies: 42
- Views: 22906
Re: ZX81 extender board for development
One pack of five please. Please consider this a firm order.PokeMon wrote:Because I can produce in a smaller series I can offer a 3-package.
Maybe I can offer a 5-package as well for about 16 GBP.
But to do I want to collect some orders first.
Mark
- Sat Nov 12, 2011 11:07 pm
- Forum: SALES
- Topic: ZX81 extender board for development
- Replies: 42
- Views: 22906
Re: ZX81 extender board for development
Now I ordered only Prototype version with 5 pieces, resulting price will be GBP 7,00 plus GBP 2,00 postage for an envelope. FIFO order service - first in, first out. Should be delivered this month as promised. Now I found a producer in China for smaller series and I could do a smaller series which ...
- Wed Nov 09, 2011 10:30 pm
- Forum: SALES
- Topic: More ZXpands / ZXpand-AY Modules
- Replies: 3
- Views: 3720
Re: More ZXpands / ZXpand-AY Modules
Selling like hotcakes...
Three ZXpands sold today
Mark
Three ZXpands sold today
Mark
- Tue Nov 08, 2011 6:27 pm
- Forum: Development
- Topic: ULA revistited.
- Replies: 168
- Views: 133385
Re: ULA revistited.
Great pictures Andy
It looks so much better in its home environment next to a Z80 on a Zeddy PCB
Mark
It looks so much better in its home environment next to a Z80 on a Zeddy PCB
Mark