Sinclair BASIC can't address more than 16k RAM, so more than that is of very limited use. Maybe there is a replacement ROM? I remember an effort to do so, but I don't know if it was followed through to completion.
I think the 32KB can be accessed by machine code programs, or "HIRES" ones ... but it's something I need to look into. There's also something about copying the ROM to the higher RAM area for some reason ... ?
![ZX81/TS1000/TS1500 Cleanup: Part 4 (TS1500 Video Mod 1) [TCE #0327]](http://i.ytimg.com/vi/Yq2jr4SlLyc/mqdefault.jpg)
![ZX81/TS1000/TS1500 Cleanup: Part 4 (TS1500 Video Mod 1) [TCE #0327]](/img/tr.png)
![🇳🇱 Gigatron TTL Computer: Part 1 [TCE #0547]](http://i.ytimg.com/vi/eSt8ybYK2po/mqdefault.jpg)
Will try this next for the RAM upgrade ... looks so much simpler!
vdrivezx.com/2022/05/23/something-for-the-zeddy/
Love this series so far. First computer I bought with my own money was the ts1000. But that dam ram pack always came undone while I was typing.
That was so infamous that it was named in the UK "RAM pack wobble".
Sinclair BASIC can't address more than 16k RAM, so more than that is of very limited use. Maybe there is a replacement ROM? I remember an effort to do so, but I don't know if it was followed through to completion.
I think the 32KB can be accessed by machine code programs, or "HIRES" ones ... but it's something I need to look into. There's also something about copying the ROM to the higher RAM area for some reason ... ?
I wish I could get my hands on a ZXpand.
Not cheap ...
www.sellmyretro.com/offer/details/zxpand%2B-zx81-timex-1000-sd-card-interface-zxpand-63279
You lost me way back at pin 0. :)
That was my problem too
@@Brfff LOL!