If you have a 16k RAM-pack, make it HRG-compatible. Simple enough, and very cheap.
Lacking a RAM-pack, build it internally. Trick out the ZX81 with 32k in the 16-48k range (HRG compatible) and 8k in the 8-16k area (make it UDG compatible). This will allow you to run most programs.
Search found 325 matches
- Sat Nov 29, 2014 6:40 pm
- Forum: Sinclair Misc
- Topic: 3 up - 3 to go
- Replies: 10
- Views: 6359
- Sat Nov 29, 2014 8:04 am
- Forum: Hardware
- Topic: Imagine...
- Replies: 7
- Views: 2227
Re: Imagine...
Haha, yes, the CPLD ULA is available. But this is not the "dreaming-and-I-will probably-do-it" thread, it's more like a "what-is-possible-but-not-until-I-have-oodles-of-time" thread. SO: I won't be building that any time soon. But: a big hooray to RetroTechie for publishing such a fine project with ...
- Sat Nov 29, 2014 7:47 am
- Forum: Hardware
- Topic: ZXpand new features?
- Replies: 4
- Views: 1486
Re: ZXpand new features?
That sounds very good, I'll have to look into my priorities regarding my ZX81 projects. First create the project-list...
- Fri Nov 28, 2014 10:43 pm
- Forum: Hardware
- Topic: Imagine...
- Replies: 7
- Views: 2227
Re: Imagine...
and dreaming some more, it would have been very nice to have a 4MHz clock with a 256 T-state raster counter for that exact 15625Hz raster. Easier to do the raster calculations, and more CPU-power running the real program. I think it would not require that much changes to the ROM, and with an FPGA/CP...
- Fri Nov 28, 2014 10:17 pm
- Forum: Hardware
- Topic: ZXpand new features?
- Replies: 4
- Views: 1486
ZXpand new features?
Now that I've ordered the ZXpand I started thinking. Would it be possible to use any of the (presumably available) serial ports on the PIC to talk to a PC in order to save/load progs to the SD-card? Would make it so much easier and faster to test code on the real thing.
- Fri Nov 28, 2014 8:46 pm
- Forum: Hardware
- Topic: Imagine...
- Replies: 7
- Views: 2227
Imagine...
...what a change it would have been if the ZX81 would have been released with 8k RAM and UDG enabled. Placing it in the 8-16k area would have made it possible to really expand the memory with 16k additional RAM! It makes sense compared to the ZX80... But I guess RAM was too expensive. Oh well. Time ...
- Fri Nov 28, 2014 8:41 pm
- Forum: Hardware
- Topic: Friday fun!
- Replies: 0
- Views: 1999
Friday fun!
Well, it was finally time. My second ZX81 got a composite video output. Now I can finally connect both my zeddies to the videocard in my Linux-box. No need to drag out the 5" TV every time.
- Fri Nov 28, 2014 4:10 pm
- Forum: SALES
- Topic: More ZXpands Available Now
- Replies: 96
- Views: 41450
Re: More ZXpands Available Now
I clicked on the ZXpand, AY-module and keyboard. Now awaiting invoice. WOHOO!!!
- Sun Nov 23, 2014 4:21 pm
- Forum: Development
- Topic: z88dk
- Replies: 6
- Views: 3531
Re: z88dk
I just downloaded the binaries, now it's only a matter of getting going...
- Sun Nov 23, 2014 3:44 pm
- Forum: Development
- Topic: z88dk
- Replies: 6
- Views: 3531
Re: z88dk
I'd really like to test coding in C for the Z80, but so far I've resisted. Must encourage myself better.