nsmith@well.UUCP (04/08/87)
Well, THOSE DISKS finally arrived a couple of days ago. I'm working on bringing MINIX up on a turbo XT clone. So far, few problems. The first thing I wrote was the code at the end of this article -- MINIX doesn't appear to understand turbo boards. Raising the speed to 8 MHz makes a noticeable difference in response. The following code is really quite trivial, and probably will eventually end up in my boot routine. For now, I'm just putting the binary for 'fast' in /etc/rc. Has anyone gotten MINIX to run on a 2,7 RLL controller like the Adaptec 2070A? I'm waiting for the tech manual from Adaptec before I dive into xt_wini.c...until then, I'm back to floppies. What follows is a shar of three files to implement 'fast' and 'slow'. neil ----- Neil Smith nsmith@well.UUCP -or- ...!ihnp4!lll-lcc!well!nsmith ----------------- Cut here --------------------------- echo x - fast.c gres '^X' '' > fast.c << '/' X/* X * speed shifter (up) for turbo type pc/xt clones X * Neil Smith (nsmith@well.UUCP) X * 7 april 1987 X * X * To compile, use: X * cc -o fast fast.c io.s X */ X X#define TSENSE 0x61 /* turbo bit sense/set port number */ X Xmain() X{ X int turbo; X X turbo = port_in(TSENSE); X turbo |= 0x04; X port_out(TSENSE, turbo); X} X / echo x - slow.c gres '^X' '' > slow.c << '/' X/* X * speed shifter (down) for turbo type pc/xt clones X * Neil Smith (nsmith@well.UUCP) X * 7 april 1987 X * X * To compile, use: X * cc -o slow slow.c io.s X */ X X#define TSENSE 0x61 /* turbo bit sense/set port number */ X Xmain() X{ X int turbo; X X turbo = port_in(TSENSE); X turbo &= 0xFB; X port_out(TSENSE, turbo); X} X / echo x - io.s gres '^X' '' > io.s << '/' X| X| io.s - port i/o routines taken from usenet X| lifted from Martin C. Atkin (martin@minster.UUCP)'s rddate shar X| posted on the net a few weeks ago...similar to routines in klib88.s X| X .globl _port_in, _port_out X X| X| i = port_in(port) X| X_port_in: X push bx X mov bx, sp X push dx X mov dx, 4(bx) X in X xorb ah, ah X pop dx X pop bx X ret X X| X| port_out(port, data) X| X_port_out: X push bx X mov bx, sp X push ax X push dx X mov dx, 4(bx) X mov ax, 6(bx) X out X pop dx X pop ax X pop bx X ret X / -- ---------------------------------------------------------- Neil Smith AT&T: (415) 644-3943 UUCP: ...!ihnp4!lll-lcc!well!nsmith