Tony, With the second screen enabled on Minerva, the System Variables are moved from $28000 to $30000 or higher. But since there is a QDOS Trap: MT.INF to locate the System Variables then it should not be a problem. Well that was the theory, because alot of older programs assumed that the System Variables do not move and the program crashed with the Minerva Second Screen enabled.
Derek Tony Firshman wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > omega wrote: > >> Hello all, >> >> I want to present kind of "demo" for QL on the retro-computing >> competition called Forever see: http://forever.zeroteam.sk >> I did some graphics already on PC and it looks good (looks cool in fact >> :-). But, I need to write special screen hadler with following conditions: >> >> 1) I need to use both screens of the QL without affecting of the 2nd >> screen by system variables. >> > That is not possible, I think, using a standard ROM. > I believe Minerva is the only ROM that supports dual screens. > >> (if there must be some variables, how much is the minimum for >> functionality interrupt handler?) >> 2) I still need to call my routine every interrupt (50/60Hz) >> 3) It must run on unexpanded QL with standard QDOS (sandyQboard >> optional), no aurora, no Q40, Q60, no (S)GC. Plain, pure, virging QL only. >> 4) Safe return to Qdos is not required. >> >> Anyone has any idea if it's possible? >> >> One more question, anyone tried to develop QL apps on PC? For example >> have you tried Easy68k? Currently I'm using macroassembler AS (by Alfred >> Arnold). >> > > > > - -- > QBBS (QL fido BBS 2:252/67) +44(0)1442-828255 > [EMAIL PROTECTED] http://firshman.co.uk > Voice: +44(0)1442-828254 Fax: +44(0)1442-828255 Skype: tonyfirshman > TF Services, 29 Longfield Road, TRING, Herts, HP23 4DG > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.2 (MingW32) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iD8DBQFF3ij8M3RzOs8+btoRAnn8AJ9D330czXtdcMDFy70HBdACfRCewgCdGTRz > VyUpyVkq9r3vHs537swuWbY= > =0Cbi > -----END PGP SIGNATURE----- > _______________________________________________ > QL-Users Mailing List > http://www.q-v-d.demon.co.uk/smsqe.htm > > -- > This email has been verified as Virus free > Virus Protection and more available at http://www.plus.net > > > _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
