But wouldn't the 52 byte buffer mentioned below be wiped out if you typed"Edit" while in BASIC, to invoke TEXT to edit your basic program?
The T102 ROM used the directory space of the three invisible files ( Suzuki, Hayashi, Ricky) for bug fixes, so I am not sure how the ROM accesses these files/buffers. Regards, Peter ------------------------------ Message: 5 Date: Thu, 12 Sep 2019 10:16:41 -0700 From: "Kurt McCullum" <[email protected]> To: [email protected] Subject: Re: [M100] compact embedded ML coding Message-ID: <[email protected]> Content-Type: text/plain; charset="us-ascii" Thanks Steve! I totally forgot about that message. On Thu, Sep 12, 2019, at 9:08 AM, Stephen Adolph wrote: > reviving this thread. Great info on a hidey hole usable when NOT in TEXT. > ..Steve > > > On Thu, May 31, 2018 at 4:38 PM Ken Pettit <[email protected]> wrote: >> Oh, >> >> And speaking of hidey holes, there is a 52-byte hidey hole that exists >> while BASIC is running that I don't believe anyone has ever realized >> exists or has used before. On the M100 this address starts at F6EBH. >> It is a table of 26 2-byte addresses which is used only in TEXT mode. >> TEXT initializes and maintains this table to hold the starting address >> of the text within the .DO file being for each line on the LCD (or DVI >> ... thus 26 entries). I call it the "line starts array". TEXT uses it >> when updating the display to keep track of the location in the .DO file >> to start drawing from ... that way it doesn't have to calculate from the >> beginning of the file for each display update. >> >> But in BASIC mode, these 52 RAMs of ram are unused. Enjoy! >> >> Ken >> >> On 5/31/18 12:49 PM, Ken Pettit wrote: >> > Yeah, that's just 4 bytes of code. That could go in a hidey hole >> > (Suzuki, Hayashi, etc.). >> > >> > Ken >> > >> > On 5/31/18 12:45 PM, John Gardner wrote: >> >> ...Reljmp.pdf... >> >> >> >> Nice. Thanks. >> >> >> >> On 5/31/18, John Gardner <[email protected]> wrote: >> >>> Hi John - >> >>> >> >>> I'm thinking about Ken's idea of having code embedded in BASIC >> >>> >> >>> jumping to code embedded in a DO file - Sounds workable, even >> >>> >> >>> reasonable with a big routine, or a number of smaller routines. >> >>> >> >>> On 5/31/18, John R. Hogerhuis <[email protected]> wrote: >> >>>> On Thu, May 31, 2018 at 12:15 PM, John Gardner <[email protected]> >> >>>> wrote: >> >>>> >> >>>>> Your code can figure out it's execution address with something like: >> >>>>> >> >>>>> call @Boo >> >>>>> Boo pop B >> >>>>> pop A >> >>>>> >> >>>>> Boo's address is now in register pair A,B... >> >>>>> >> >>>> But you kind of already know since that code would have to be >> >>>> relocated >> >>>> to >> >>>> function. >> >>>> >> >>>> -- John. >> >>>> >> > >> -------------- next part -------------- An HTML attachment was scrubbed... URL: < http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/attachments/20190912/146c97c2/attachment-0001.html >
