Search found 542 matches

by stefano
Fri Sep 29, 2023 12:19 pm
Forum: Development
Topic: Sorting out the zx81 library set on z88dk
Replies: 2
Views: 4641

Re: Sorting out the zx81 library set on z88dk

I also updated the ZX81 specific version of DSTAR to get a valid version for the ZX80 with "NEW ROM" (aka ZX81 in FAST mode). It looks a bit flickery on EO, the results look much better in 50hz mode, but I can't predict how it will be on a real TV. Probably the "intelligent" color TV and LED TV chip...
by stefano
Fri Sep 29, 2023 12:17 pm
Forum: Development
Topic: Detecting if in FAST mode?
Replies: 2
Views: 4651

Re: Detecting if in FAST mode?

It is a bit of fun having the code repeatedly checking the hardware status! You might even add a switch on the 50/60hz diode and the raster frequency would change at runtime :) Thankyou for the information, at the end I chose a different approach and totally replaced the fgetc() code to reduce flick...
by stefano
Fri Sep 29, 2023 11:57 am
Forum: Development
Topic: Sorting out the zx81 library set on z88dk
Replies: 2
Views: 4641

Re: Sorting out the zx81 library set on z88dk

I finally succeded in getting the display visible in FAST mode also on the ZX81 and on the LAMBDA ROMs (untested).
This program should run correctly on a ZX80 with ZX81 ROM as well as on a ZX81.
by stefano
Thu Sep 28, 2023 7:36 pm
Forum: Development
Topic: Detecting if in FAST mode?
Replies: 2
Views: 4651

Detecting if in FAST mode?

I'm wondering what's the right way to check if we're in FAST mode.
I'm concerned in trusting the system variables because the ZX81 ROM can be running as a retrofit in a ZX80, which obviously is never in FAST mode.
I haven't fully understood how the SLOW/FAST subroutine works in rom
by stefano
Thu Sep 28, 2023 4:14 pm
Forum: Development
Topic: Sorting out the zx81 library set on z88dk
Replies: 2
Views: 4641

Sorting out the zx81 library set on z88dk

I've been recently working on the less common versions of the LAMBDA 8300 ROMs, and hopefully I made everything more flexible by adding two new subtypes ("mono" for the v1 ROM and "cac3" for the CAC-3 and the NF300). While woring on it I noticed that I had never ported some of the ZX81 functions, su...
by stefano
Wed Sep 27, 2023 3:32 pm
Forum: Software
Topic: Programmer's toolkit
Replies: 0
Views: 12830

Programmer's toolkit

I described this technique in the ZX81 section already, this is the derived version for the Lambda clones. NOTE: THIS IS AN EARLIER, BUGGY VERSION THE ENTRY LOCATIONS WILL PROBABLY CHANGE For V1 (older) ROM, add 1 to all the listed values (19110 -> 19111) ============================================...
by stefano
Mon Sep 25, 2023 5:25 pm
Forum: Lambda 8300/ Power 3000 Lounge
Topic: Different ROMs for Lambda 8300
Replies: 42
Views: 51662

Re: Different ROMs for Lambda 8300

I was counting on you :lol: Well I've almost finished, I think I spotted the equivalent entries also for interfacing C to BASIC (and vice-versa), I'm testing it on the different ROMs but most of the code looks valid also on the later ROM version with more differences from the ZX81. printf ("Basic le...
by stefano
Mon Sep 25, 2023 5:12 pm
Forum: Software
Topic: ELIZA
Replies: 3
Views: 4738

Re: ELIZA

Now extended to CAC-3 / NF300 and V1 ROM.
by stefano
Sat Sep 23, 2023 11:50 am
Forum: Software
Topic: DSTAR on all the Lambda models
Replies: 1
Views: 4326

Re: DSTAR on all the Lambda models

As a bouns, I think that the horse animation is somewhat satisfactory if you have a slow computer.
Type any key repeatedly to hit the horse and make it run faster.
by stefano
Sat Sep 23, 2023 9:58 am
Forum: Software
Topic: Word Processor: Tasword for Lambda 8300
Replies: 24
Views: 24972

Re: Word Processor: Tasword for Lambda 8300

you can still load the programs on EO, but you csn't rely on flash loading To be able to quickly load the .p program EightyOne taps the ROM and reacts when the emulated program counter register reaches the tape routine. The location is hardcoded in the emulator and works with the known ROM types onl...