Search found 406 matches

by stefano
Wed Oct 23, 2019 10:25 pm
Forum: Software
Topic: Comparison of ROM calls for ZX81 vs Lambda-v1 vs Lambda-v2
Replies: 3
Views: 2333

Re: Comparison of ROM calls for ZX81 vs Lambda-v1 vs Lambda-v2

This is an interestink work. I should improve basck sooner or later to make it more effective on the Sinclair BASIC but at the end there are few variants aroud and comparing the asm sources is not that nightmare.. Where can the "other" LAMBDA ROM be found ? A new z88dk option is feasible, probably a...
by stefano
Tue Oct 22, 2019 7:08 pm
Forum: Software
Topic: Porting PDP11/VAX programs to the ZX81
Replies: 2
Views: 887

Re: Porting PDP11/VAX programs to the ZX81

The promised game. Program header says: /* * Amazing demonstration program * * Rewritten from a Pascal program marked: * "Copyright 1976, * Oregon Museum of Science and Industry * 4015 SW Canyon Road * Portland Oregon 97221 * (503) 248-5923 * "Permission is hereby granted to republish (but not * for...
by stefano
Wed Oct 16, 2019 8:09 pm
Forum: Software
Topic: [TS HORIZONS] Paul Hunter's Bank Switching.
Replies: 12
Views: 1100

Re: [TS HORIZONS] Paul Hunter's Bank Switching.

the first one I pointed out looked wrong, I was almost sure of the error.
are we sure the printout in the magazine was correct?
errors were frequent
by stefano
Tue Oct 15, 2019 5:28 pm
Forum: Software
Topic: Happy pi day - March 14th
Replies: 5
Views: 1637

Re: Happy pi day - March 14th

Very late.. but this article must be in the loop:

https://github.com/z88dk/z88dk/wiki/pi
by stefano
Tue Oct 15, 2019 10:22 am
Forum: Software
Topic: HELP WANTED: ZX81 "lost" files
Replies: 3
Views: 495

Re: HELP WANTED: ZX81 "lost" files

http://zxspectrum.hal.varese.it/riviste.htm

.. some of the covers. The magazines came optionally with a cassette tape, ZX81 on one side, ZX Spectrum on the other side.
by stefano
Tue Oct 15, 2019 10:15 am
Forum: Software
Topic: HELP WANTED: ZX81 "lost" files
Replies: 3
Views: 495

Re: HELP WANTED: ZX81 "lost" files

AVVMARTE and others probably come from "SuperSinc", an Italian magazine.

http://zxspectrum.hal.varese.it/zx81.htm

..at bottom you can see three links including the correct references.
by stefano
Tue Oct 15, 2019 10:10 am
Forum: Software
Topic: [TS HORIZONS] Paul Hunter's Bank Switching.
Replies: 12
Views: 1100

Re: [TS HORIZONS] Paul Hunter's Bank Switching.

230A: 2A 00 26 LD HL,(L25FE+2) ; reference not aligned to instruction

..there could be also a couple of bytes missing, but I'm not sure. What is this ROM supposed to do ?.
by stefano
Tue Oct 15, 2019 9:51 am
Forum: Software
Topic: [TS HORIZONS] Paul Hunter's Bank Switching.
Replies: 12
Views: 1100

Re: [TS HORIZONS] Paul Hunter's Bank Switching.

213A: 2A 33 26 LD HL,(L2632+1) ; reference not aligned to instruction .. please check, byte sequence (2A 33 26) could possibly be (2A 33 39). In decimal it would mean changing sequence (42, 51, 38) to (42, 51, 57). Trying to guess, if it is really a type error, it could be consequence of the similar...
by stefano
Tue Oct 15, 2019 9:21 am
Forum: Software
Topic: [TS HORIZONS] Paul Hunter's Bank Switching.
Replies: 12
Views: 1100

Re: [TS HORIZONS] Paul Hunter's Bank Switching.

This is the assembly of the bytes you entered.

bank.asm
(77.05 KiB) Downloaded 45 times
by stefano
Tue Oct 15, 2019 9:06 am
Forum: Software
Topic: Porting PDP11/VAX programs to the ZX81
Replies: 2
Views: 887

Porting PDP11/VAX programs to the ZX81

I recently found online the dumps of the tapes from DECUS, the US user group for Digital stuff back in the earlier eighties. A good part of the programs was created back in the seventies and then adapted to the "new" operating systems, etc. Something was originally written in FORTRAN and then ported...