Search found 7 matches

by tsm
Sun Jan 27, 2019 6:25 pm
Forum: Hardware
Topic: Making a +3 compatible FDD interface
Replies: 9
Views: 369

Re: Making a +3 compatible FDD interface

Many thanks to all who replied.
by tsm
Sat Jan 26, 2019 10:49 pm
Forum: Hardware
Topic: Making a +3 compatible FDD interface
Replies: 9
Views: 369

Re: Making a +3 compatible FDD interface

Got it, @Guesser, thanks!
Yeah @zxbruno, I also bought some Tesla PROMs, then I realized that the integrated data separator can be had and its usage greatly simplifies the circuit.

Can anyone confirm that R76 is there to keep the drives unselected during reset?
by tsm
Sat Jan 26, 2019 4:29 pm
Forum: Hardware
Topic: Making a +3 compatible FDD interface
Replies: 9
Views: 369

Re: Making a +3 compatible FDD interface

By the way... I see that the controller IC has hardware provision for supporting up to 4 drives. Is this allowed by the computer's architecture and ROM, or are 2 drives the maximum possible?
by tsm
Sun Jan 20, 2019 12:19 am
Forum: Hardware
Topic: Making a +3 compatible FDD interface
Replies: 9
Views: 369

Re: Making a +3 compatible FDD interface

Thank you guesser!
by tsm
Sat Jan 19, 2019 6:14 pm
Forum: Hardware
Topic: Making a +3 compatible FDD interface
Replies: 9
Views: 369

Making a +3 compatible FDD interface

Hello I have a 128 +2B so I figured I could replicate the +3 FDD interface exactly, provided I found the parts needed. The idea is to make a detachable cartridge rather than hacking my Speccy. Problem is, not all necessary signals are available at the expansion connector: I need the NRS signal from ...
by tsm
Thu May 24, 2018 10:13 am
Forum: Programming
Topic: Basic VAL function
Replies: 18
Views: 1085

Re: Basic VAL function

Got it, thank you!
by tsm
Thu May 24, 2018 9:16 am
Forum: Programming
Topic: Basic VAL function
Replies: 18
Views: 1085

Basic VAL function

Hello! If I'm not mistaken, the VAL function takes a string containing an expression and returns a number which represents the result of the expression. I'm reading a Basic listing and I found some constructs that confuse me a little. Some examples: LET d=VAL "256" GO SUB VAL "900" POKE VAL "23658",...