Re: "Less than" key and PET tape drive, again

From: Ethan Dicks <*ethan.dicks_at_gmail.com*> Date: Tue, 7 Jan 2025 19:38:23 -0500 Message-ID: <CAALmim=-vs9Y0Ei8VVx-DcZ4ySuqG7LsySsEVVguwkK9L5-WBw_at_mail.gmail.com> · ethan.dicks_at_gmail.com

On Tue, Jan 7, 2025 at 6:42 PM Ethan Dicks <ethan.dicks_at_gmail.com> wrote:
> On Sat, Jan 4, 2025 at 5:57 PM Rhialto <rhialto_at_falu.nl> wrote:
> > I think I asked here before if people knew about the effect on a PET
> > ...where if you press the < key... while loading from tape, it prints < chars
>
> "Programming the PET/CBM" at the bottom of page 244:
>
> (See locations $E6AB ff.. In BASIC 2, for example).

That was the pointer I needed...  Here's the detect code...
00805  E69C  BD F7 E6           LDA CHAR-1,X
00806  E69F  D0 06              BNE CKIS1
.
.
.
00810  E6A7  C9 FF       CKIS1  CMP #$FF
00811  E6A9  F0 0B              BEQ CKUT
00812  E6AB  C9 3C              CMP #$3C
00813  E6AD  D0 05              BNE SPCK
00814  E6AF  2C 11 E8           BIT PIAL1
00815  E6B2  30 02              BMI CKUT
00816  E6B4  86 A6       SPCK   STX SFDX
00817  E6B6  68          CKUT   PLA

So this bit of code updates or doesn't update SDFX depending on what
keys are or are not pressed down and if PIAL1 has the high bit set or
cleared.

Seems like it acts like a stuttering repeat depending on the state of PIAL1.

-ethan