3 Rom Switcher

[1024MAK]

Some are available as part of the eighty one emulator download. Some are available on other web sites (bit hard to list as I'm currently using a mobile in a café).

If the forum's own search is not being very helpful, use Google (or your favourite search tool/site) like so:

Code: Select all

site:https://www.sinclairzxworld.com searchterm

Mark

[Moggy]

i was just reading up on h4th. Looks very interesting. I’ve never tried forth so might be fun to have a go.
I found a few other posts, and it seems there are many alternate roms,,eg aszmix, tree forth, etc
Maybe I should make a 8/16 way switch/selector
Do you know where I could find h4th, or in fact all the roms? I seem to be struggling to find files on the forum

You'll find the ROMs where Mark points out however I'm certain the H4th (UK version of Treeforth ROM) found in Eighty One has a maths bug in it still uncorrected so will dig out the corrected one.

Here it is.

[Moggy]

Should you have any real interest in Forth then there is a much superior version, albeit one requiring the ZXpand interface, that is based on Forth-79 which I'll happily walk you through.

The H4th whilst hardware based is slow in comparison, has a very flaky high speed tape save/load routine and is very non standard in application despite claiming Fig-Forth compatibility.

[Moggy]

Yes just checked the H4th ROM in Eighty One is still the bugged one so use the one I posted.

[gwpt]

Great, thanks for the links and tips. I’ll see if I can find any more

[gwpt]

I scoured the forum and web as best as I could and have so far found 14 roms:

01 - Orig Basic with bug
02 - Improved Basic Fixed sqrt bug
03 - Final Sinclair v3
04 - h4th forth with bug fix
05 - h4th with bug
06 - shoulder of giants
07 - Big Bang
08 - tree forth
09 - SG81 F
10 - ASZMICE07 (4k - duplicate)
11 - Aaszmic 04 (4k - duplicate)
12 - zx80 (4k - duplicate)
13 - Z80Assember (3000)
14 - QuickLoadSaveRom (2000)

I think the 1st 12 should work fine as replacement roms.

* But I am unsure about Z80Assember and QuickLoadSaveRom. I noticed they have a memory offset, so are they in-fact ones that would be loaded
whilst still having the standard rom installed? (in which case, no good as a replacement roms)
* Also, is 'Coral Basic Interpreter' a replacement rom? I couldn't figure that out. or find the rom for that matter.
* Are there any others I've missed?

I assume practically several are not at all useful. i.e. buggy versions etc. Perhaps a more sensible (but still over the top ) list would be:

01 - Orig Basic with bug
02 - Improved Basic Fixed sqrt bug
03 - Final Sinclair v3
04 - h4th forth with bug fix
05 - shoulder of giants
06 - Big Bang
07 - SG81 F
08 - ASZMICE07 (4k - duplicate)

Which would fit nicely on a 27C512, and the title should change to 3bit rom switcher

[1024MAK]

Keep in mind that the ZX80 ROM does not know about the extra hardware (in the ULA) associated with the ZX81 “slow” mode. The ZX81 ROM however was designed to work in the ZX80.

Memotech also produced other expansions that contained ROMs, There is a list here.

Mark

[Paul]

For ZX80 ROM in a ZX81 see this:
https://www.sinclairzxworld.com/viewtop ... ess#p36573

[mrtinb]

If you make a ROM switcher for the ROM area $0000 - $1FFF, the Z80Assembler and QuickLoadSaveRom will be of no use to you.

Coral Basic Interpreter is software that is loaded into RAM, so that's no use for you either.

[Moggy]

Also worth mentioning is that the Tree Forth ROM ( also known as Tree-soft Forth, Multi-Forth or Pluri-Forth ) is the original USA NTSC 60Hz Forth ROM that the UK H4th was copied from albeit with an added maths bug and won't work in a standard UK ZX81 without a bit of alteration so the bug fixed H4th is the one to use.

If thinking about a ZX80 in a ZX81 then the link Paul gave is useful, I have converted a ZX81 to ZX80 that works with the ZXpand and is the cheapest way to get a ZX80 the only down side is that is doesn't play nicely with some flicker free and hi-res programs, other than that well worth doing.

To work with the ZXpand however a different ROM code is used than the standard ZX80 version to take into account the commands needed by the ZXpand and if memory serves is 8k not 4k which is no problem. If tape only is sufficient then the standard ZX80 ROM will suffice.