Here's the patch I wrote after applying your base patch. I must be
making a silly mistake here, since it doesn't seem to work correcly.
Semi-colon is no longer shifted as expected, but it's not catching the
`o' for some reason.
.org 0722CH
MOV A,C ; unchanged
JMP extra ; go to patch [C3 AB 75]
back(7230): MVI E,2CH ; unchanged
RET ; unchanged
.org 075ABH
extra: CPI 1BH ; check for `o' [FE 1B]
RZ ; [C8]
CPI 19H ; > 25 ? [FE 19]
RNC ; [D0]
JMP back ; [C3 30 72]
On Sat, Nov 25, 2023 at 04:48:40PM -0500, Stephen Adolph wrote:
> here is a file "base_patch" that describes 4 changes to the Main ROM to
> create a hole from
> 75AB to 7640
> which is free to use.
>
> "... Base patch, which provides about 150 free bytes to use for
> modifications to the M100 ROM. The basis of this patch is the
> observation that the PIO data table could be reduced from 240 bytes to
> 80 bytes. This change forces a rewrite of a short section of a
> routine."
>
> Good luck with it; I used it to implement the hardware scroll patch for
> the M100.
> The hardware scroll patch document has a section that details how the
> base patch works.
> cheers
> Steve
>
> On Sat, Nov 25, 2023 at 1:05 PM runrin <[email protected]> wrote:
>
> Wow, Stephen! Of course you know exactly where it is!
>
> Thanks so much! If you could share your character printing patch I'd
> appreciate it.
>
> Looks like the simplest way to get `o' to work with caps lock would
> be
> to just accept that `;' and `[' will also be shifted, and change the
> 27
> to a 29.
>
> It'll be fun to rewrite the routine though. It looks like there are
> 5 or
> 6 bytes free at the end of the ROM, so being able to squeeze the
> patch
> in there would be pretty nice.
>
> On Sat, Nov 25, 2023 at 08:34:30AM -0500, Stephen Adolph wrote:
> > Since you are modifying the ROM, you may find to get what you
> want you
> > need more space.
> >
> > I have a patch that rewrites some routines for character
> printing that
> > frees up about 180 bytes if I recall correctly. I've used this
> to fix
> > things I don't like in the Main ROM.
> >
> > I'm happy to share that patch, should your hacking require some
> bytes.
> >
> > to your question.
> >
> > 722CH (79H) MOV A,C Handle CAPS LOCK key during key decoding
> > 722DH (FEH) CPI 1AH
> > 722FH (D0H) RNC
> > 7230H (1EH) MVI E,2CH
> > 7232H (C9H) RET
> >
> > if the "regular key" is > 26 the key is not modified.
> > because the key # for o is 27, no upper case.
> >
> > So you need a more complicated routine at 722Ch
> >
> > On Sat, Nov 25, 2023 at 1:08 AM runrin <[email protected]> wrote:
> >
> > Hey all!
> >
> > I just finished building my FlexROM and patching the system
> rom for
> > my
> > keyboard layout of choice (colemak). I'm super excited about
> it
> > because
> > it will make my m100 much more usable for me.
> >
> > Here are the relevant lines of the rom that were patched if
> anyone
> > is
> > interested:
> >
> > 00007BF0 AA 7A 78 63 76 62 6B 6D 69 61 72 73 74 64 68 6E
> > .zxcvbkmiarstdhn
> > 00007C00 65 71 77 66 70 67 6A 6C 75 79 3B 5B 6F 27 2C 2E
> > eqwfpgjluy;[o',.
> > 00007C10 2F 31 32 33 34 35 36 37 38 39 30 2D 3D 5A 58 43
> > /1234567890-=ZXC
> > 00007C20 56 42 4B 4D 49 41 52 53 54 44 48 4E 45 51 57 46
> > VBKMIARSTDHNEQWF
> > 00007C30 50 47 4A 4C 55 59 3A 5D 4F 22 3C 3E 3F 21 40 23
> > PGJLUY:]O"<>?!@#
> > ...
> > 00007CF0 00 00 00 D4 D2 D3 A6 A7 A8 6D 30 6E 31 65 32 69
> > .........m0n1e2i
> > 00007D00 33 6C 34 75 35 79 36 01 06 14 02 20 7F 09 1B 8B
> > 3l4u5y6.... ....
> >
> > The last two lines makes the number pad work correctly (an
> extremely
> > easy fix!)
> >
> > There is just one small bug with my patch, and that is caps
> lock not
> > working correctly. When caps lock is enabled, `o' remains
> lowercase
> > and
> > `;' types a `:'. I presume this is due to the way caps lock
> works
> > with
> > the keyboard matrix. The letter `o' has been moved out of the
> letter
> > rows of the keyboard matrix, and is now in one of the symbol
> > rows. The opposite is true of the semi-colon, now being part
> of the
> > letter matrix replacing `p'.
> >
> > Does anyone know if caps lock is done in software, or if it's
> > modifying
> > which characters are being selected by pulling a bit high or
> > something?
> >
> > This is a really small issue, but I would like to get it
> working
> > correctly. I'll dive into the schematic when I have some time
> and
> > see if
> > I can find a hint about how caps lock works. If not I'll
> start
> > messing
> > around with Virtual-T and see what I can find there.
> >
> > If I dig anything interesting up, I'll update this thread
> with what
> > I
> > learn.
> ; patch #1 for M100/T102 rom
> ; this patch reduced the amount of space needed in the LCD patterns table,
> enabling room for future changes
>
> ; blocks:
>
> ; 7467 - 746E checked
> ; 74BB - 74EA checked
> ; 7551 - 75AA checked
> ; 75AB - 763F hole created
>
>
>
>
> ;--------------------------------------------------------------------------------------
>
> ;PATCH2
> ; Proposed replacement code 7467 to 746E
> ;checked
>
> .org 07467H
>
> p2: LXI H,7643H
> CALL p5
> NOP
> NOP
>
>
> ;--------------------------------------------------------------------------------------
> ;PATCH3
> ; Proposed replacement code 74BB to 74EA
> ; checked
>
> .org 074BBH
>
> p3: RLC
> MOV C,A
> MVI B,00H
> LXI H,7551H
> DAD B
> MOV C,M
> INX H
> MOV A,M
> PUSH PSW
> LDA 0FFF4H
> RAR
> RAR
> RAR
> LXI H,7643H
> CALL p5
> CALL 753BH
> SHLD 0FFF6H
> POP PSW
> ORA B
> MOV B,A
> POP H
> DCR D
> CALL 74F7H
> INR D
> MVI A,06H
> SUB E
> RZ
> MOV E,A
> PUSH H
> LHLD 0FFF6H
>
>
> ;--------------------------------------------------------------------------------------
> ;PATCH4
> ; this is the corrected LCD table 7551 to 75A0 240 bytes
> ; 75A1 to 7640 is free to use, 160 bytes total
> ; checked
>
> .org 07551H ; 80 bytes
> p4: .db 00H,00H,00H,06H,00H,0CH,00H,12H,00H,18H,00H,1EH,00H,24H,00H,2AH
> .db 00H,30H
> .db 02H,04H,02H,0AH,02H,10H,02H,16H,02H,1CH,02H,22H,02H,28H,02H,2EH
> .db 04H,02H,04H,08H,04H,0EH,04H,14H,04H,1AH,04H,20H,04H,26H,04H,2CH
> .db 06H,00H,06H,06H,06H,0CH,06H,12H,06H,18H,06H,1EH,06H,24H,06H,2AH
> .db 06H,30H
> .db 08H,04H,08H,0AH,08H,10H,08H,16H,08H,1CH,08H,22H
>
>
>
>
> ;--------------------------------------------------------------------------------------
> ;PATCH5
> ; Proposed subroutine at 75A1H to 75AA
> ; checked
> .org 075A1H
>
> p5: JNC ahead1
> MVI L,4DH
> ahead1: MVI B,00H
> DAD B
> MOV B,A
> RET
>
>
> ; 75A1 to 75AA is used
> ; 75AB to 7640 free to use
>
> ;--------------------------------------------------------------------------------------
>
> .org 075ABh
> .db 00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00,00,00,00,00,00,00,00
> .db 00
>
> .end
>
>
>
>
