duo o8ones sto linux-box ????

[Alexios Chouchoulas]

On Mon, 31 Mar 1997, Michalas Othon wrote:

>  An balw sto Linux-box duo controlers VGA h enan Hercules kai enan VGA,
> 8a mporw na paizw tautoxrona kai sta duo??

  Oxi kai nai, antistoixws.

  Den mporeis na exeis dyo egxrwmes kartes taftoxrona se ena PC. An to
kaneis dhmiourgountai conflicts, kathws oles oi kartes exoun ta idia I/O
ports (oute kan tolmaw na ta anaferw ola, einai PARA polla gia mia sygxronh
SVGA) kai ginontai mapped sthn idia perioxh mnhmhs (gia ton framebuffer). To
Plaisio to eixe kanei prin apo xronia, bazontas tessereis idies Trident VGA
sto idio PC, opou kathe mia odhgouse apo mia othonh. Douleve, me oles tis
othones na deixnoun to idio pragma. Alla douleve apo katharh tyxh, kai den
thelw na skeftomai ti kolash pernage h motherboard pou epairne ola ta shmata
elegxou pisw eis tetraploun. :-)

  Ws egxrwmes kartes orizontai oi [S]VGA se egxrwmo mode(*), EGA, PGA, CGA
kai oi symbates tous.

  Mporeis na exeis mia egxrwmh kai mia monoxrwmh karta sto idio bus
(monoxrwmh karta = [S]VGA se monoxrwmo mode(*), Hercules kai MDA.

  (*) Merikes palies [S]VGA exoun option (dip switch h jumper) na ksekinane
      se monoxrwmo mode (Hercules/MDA emulation) h se egxrwmo (VGA native, h
      EGA/CGA emulation). Einai spania zwa pia, alla poly xrhsimes.

  A, fysika tyxon Dual (CGA+Hercules, apo palio XT clone) kartes doulevoun
  ki aftes, arkei na eisai ksereis se poio mode kanoun boot (afto
  rythmizetai kata 99% me jumpers h dip switches).


  Apo software yposthriksh, yparxei ena kernel patch pou epitrepei plhrh
yposthriksh enos systhmatos me diplh othonh, dhladh exeis epipleon virtual
consoles kai epipleon plhktra pou sou epitrepoun na allazeis to "keyboard
focus" apo thn mia othonh sthn allh, kai meta na allazeis virtual desktops
sthn trexousa othonh. To lene multimon an den kanw lathos kai tha to breis
sto directory kernel/patches/console tou Sunsite. Aftes oi plhrofories
mporei na einai frikta ektos topou kai xronou, mia kai exw na xrhsimopoihsw
afto to patch edw kai POLY kairo.

  Enallaktika, me poly ligoteres dynatothtes alla egkyhmenh leitourgia katw
apo Linux 2 (kai xwris anagkh patch), yparxei sto idio directory to module
mda (mda-0.9 sta Infomagic CD tou Septembriou). Einai poly periorismeno.
Yposthrizei mia aplh, monh konsola me thn elaxisth dynath VT-100
yposthriksh. Alla exei to kalo oti einai poly aplo kai einai kai module,
opote to peirazeis kata boulhsh. To xrhsimopoiw edw kai enamish xrono
peripou sthn dikh mou diplh othonh kai den exw to paramikro parapono.
Leitourgei dhmiourgwntas ena neo device. Xtypas to katallhlo mknod sto /dev,
kai o,ti steileis sto /dev/mda (px) phgainei pleon sthn monoxrwmh othonh.
Proswpika to xrhsimopoiw gia na blepw ta logs tou systhmatos. Exei
apodeixthei poly xrhsimo kataskevasma.

(
    A, kati kapws ektos thematos. H karta pou odhgei thn monoxrwmh othonh
  einai mia original IBM MDA, plhrous mhkous, gemath TTL oloklhrwmena (an
  sou dwsoun to sxedio mporeis sxedon na thn ftiakseis agorazontas ylika apo
  magazi -- den tha breis mono thn ROM ths kai to Motorola 6845, ton CRT
  controller). Loipon, h karta afth bghke apo ena IBM PC tou '81 (8088 sta
  4.77 MHz, 64K RAM, thyra kasetofwnou kai ROM Basic -- doulevei akoma),
  mphke se ena 486DX4-120 me PCI, kai *DOULEVEI YPEROXA*. Oute ena parapono
  gia pshles taxythtes tou bus, klp klp. Otan oles oi alles mou sygxrones
  kartes psofane logw grhgorou rologiou, h MDA antexei akoma. Gia parte mia
  S3 kai balte thn se PC meta apo 16 xronia na deite ti xrwma kapnous tha
  bgalei. :-)))

    Re paidia, h IBM mporei na einai kyhma tou Satana, alla kserei na kanei
  gero hardware (ase pou an kati den mou aresei panw sthn karta mporw na to
  allaksw. Einai toso apelpistika katanohth h atimh -- px brhka hack pou
  metatrepei thn on-board parallhlh ths MDA se bi-directional. Ena kalwdiaki
  einai olo ki olo). :-)
)


> p.x. sto ena na eisagw stoixeia kai sto allo na blepw apotelesmata ???

  Oi othones einai output devices. Einai ligoulaki dyskolo na eisageis
stoixeia se othonh, ektos ki an milame gia othonh afhs. :-)))


> Mporei kapoios apo th lista na analabei na to ftia3ei ??
> (Oxi kat anagkh tsampa :))))

  An theleis, mporw na sou dwsw ta patcharismena sources tou mda pou
yposthrizoun kapws pio proxwrhmeno elegxo ths kartas (px vcsa-like device
gia apeftheias prosbash ston framebuffer). Den einai poly pio xrhsimo apo
thn kanonikh ekdosh, alla pote den kserei kaneis. A, yp'opsin: logw
eksairetika periorismenwn dynatothtwn, mhn perimeneis na trekseis sobara
interactive applications panw sto /dev/mda. Nten telei.

A.

Alexios Chouchoulas          '88    ,88'   ,88'     alexios at vennea.demon.co.uk
The Unpronouncable One      ,o88oooo88ooooo88oo,              axc at dcs.ed.ac.uk
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