Sinclair ZX80 / ZX81 / Z88 Forums

Posted: **Mon Oct 15, 2018 1:53 pm**

olofsen wrote: ↑Mon Oct 08, 2018 11:25 pm Attached are a Sponzy version, and a ZX81 program to start it, so that TAPs such as FLIPPIT can be loaded via USB on the ZXmore.

Is the Sponzy-Rom in the ZIP a special version (patched?) or ZSOLT's original version?
Just to avoid possible confusion ...

Siggi

Posted: **Tue Oct 16, 2018 8:00 am**

Yes, it is a special version (with a tiny patch for the tape loading) of the latest Sponzy I obtained from Zsolt.

Posted: **Tue Oct 16, 2018 11:24 pm**

Unfortunately I've not been able to get this to work - running the file at instance one takes me to the SPONZY instance somehow (I assime instance 2 but also I have the SPONZY on instance 7). But I can't seem to load any TAP files (or at least I don't know how to).

Do you have a dumb-down instructions?

Regards,

Shaun.

Posted: **Wed Oct 17, 2018 11:10 am**

Hi,

siggi wrote: ↑Mon Oct 15, 2018 1:53 pm Is the Sponzy-Rom in the ZIP ..... ZSOLT's original version?

Not exactly: it is different in the "startup" and the "new" section and "DI" instructions have been removed from the entire code.
And Erik found a bug during tests of his driver program, which has been fixed.

And now i made some changes in the NMI handler too:

Code: Select all

;
; ------------------------------------
; THE 'NON-MASKABLE INTERRUPT' ROUTINE
; ------------------------------------
;
L0066:				; size	! Ts	! 
	push af			; 1	! 11	! save ACC & Flags

;;-	ld a,(NMICNT)		; 3	! 13	! decrement
	ld a,i			; 2	! 9	!  decrement

	dec a			; 1	! 4	! and store

;;-	ld (NMICNT),a		; 3	! 13	! counter
	ld i,a			; 2	! 9	! counter

	jr z,NMI_1		; 2	! 7/12	! --> L003A
	;
	pop af			; 1	! 10	! restore ACC & Flags
	;
	ret			; 1	! 10	! cont.orig.task

This mod gives back 8 Tstates / NMI to the user program, so speed is increasing (~5%).

Enjoy,
Zsolt

sponzy2018.zip: (12.81 KiB) Downloaded 268 times

ps: I try to incorporate also the novelties of the "bigbang" ROM

Posted: **Fri Nov 09, 2018 11:05 am**

Hi Zsolt
would it be sufficient to copy the bytes from $66 to "ret" into Erik's patched rom to have the full speed also with this patched rom?

And is it not possible to have only one rom (including Erik's patches)?

Siggi

Posted: **Fri Nov 09, 2018 1:51 pm**

Hi,

siggi wrote: ↑Fri Nov 09, 2018 11:05 am And is it not possible to have only one rom (including Erik's patches)?

It is more than possible

just use the sponzy2018.rom above - it contains Erik's patch.
Regards,
Zsolt

Posted: **Fri Nov 09, 2018 8:20 pm**

Shaun_B wrote: ↑Tue Oct 16, 2018 11:24 pm Unfortunately I've not been able to get this to work - running the file at instance one takes me to the SPONZY instance somehow (I assime instance 2 but also I have the SPONZY on instance 7). But I can't seem to load any TAP files (or at least I don't know how to).

AFAIK it does not work on all filenames. Currently only a-z and numbers could be used as filename (but not long filenames, only 8.3 format).
And the program name inside the TAP must exactly match the filename (uppercase/LOWERCASE!) (e. g. file "jsw16k.tap" containing program "jsw16k").
Load it using command LOAD "jsw16k"

Examples.zip: (6.5 KiB) Downloaded 244 times

But I don't know what to do, if the program name inside the TAP is longer or does contain other characters ...

Siggi

Edit: Try this program (I were able to load it):
viewtopic.php?f=14&p=32310#p32282

Posted: **Sat Nov 10, 2018 11:12 am**

Hi ZSOLT
I just tried to get the graphic chars of Sponzy rom (pressing SHIFT-G)
chars 1-8 and Q-Y show the correct characters (like on ZX81)
But chars A-H give wrong pixel patterns.

Don't this ZX81 graphic chars exist on Speccy?

Siggi

Posted: **Sun Nov 11, 2018 6:44 pm**

Hi Siggi,

No, these are ZX81-specific patterns, but ...
In SPONZY they are available as UDGs (chr$ 144 ... chr$ 164), which are defined during the startup:

Code: Select all

L0000:
	out ($FD),a		; Switch NMI off!

	LD	DE,$FFFF	; Set pointer to top of possible physical RAM.
	JP	L11CB		; Jump forward to common code at START-NEW.

; -------------------
;; START-NEW
; -----------------------

L11CB:
	ld a,d			;
	and e			;
	ld b,a			; Save the flag to control later branching.
L11CE:
	ld a,$3F		;

; -----------------------
; THE 'RAM CHECK' SECTION
; -----------------------


; then later...


	inc b			; now test if we arrived here from NEW.
	jr nz,RAM_SET		; forward to RAM-SET if we did.

;	This section applies to START only.
;
	ld sp,hl		; set up the machine stack pointer.
	call setPRAMT		; set P-RAMT to the highest working RAM
				; address.
	ld de,$3EAF		; address of last byte of 'U' bitmap in ROM.

; Copy INVERSE of the standard characters A - U.
; there are 21 user defined graphics.

	ld bc,$A830		; 21 standard (B) and 6 extra ZX81 chars (C).
FILL_INV
	ld a,(de)		; get pattern byte
	cpl			; invert it
	ld (hl),a		; put pattern byte
	dec hl			; decrement
	dec de			; the pointers
	djnz FILL_INV		; next

	inc hl			; update to start of inv. 'A' in RAM.
	ld ($5C7B),hl		; make UDG system variable address the first bitmap.

	ld de,$004F		; address of extra characters
	add hl,de		; set pointer

	ex de,hl		; switch pointers
	ld hl,$3CFF		; last address of extra characters in ROM
	lddr			; fill

	ld hl,($5C7B)		; restore
	dec hl			; pointer

	ld c,$40		; set the values of
	ld ($5C38),bc		; the PIP and RASP system variables.

;	The NEW command path rejoins here.
RAM_SET

: After the normal startup you can use (and redefine) the UDG set.

: the UDGs from keyboard in "G" mode

I think, i found the reason of the problem: if 'DE' <> $FFFF at beginning of the 'START-NEW' section, then value of 'B' will be other than $FF. This means that UDG initialization is not done - as in case of the 'NEW' instruction.

The solution for 'ZTOS.p':

Code: Select all

	ld de,LAST_RAM_ADDR	; the latest address in front of the USB-driver
	ld b,$FF		; signal of 'STARTUP'
	jp L11CE		; entry point of 'START-NEW'

It's my fault, because we (Erik and me) did not talk about the startup

sorry.
Zsolt

Posted: **Sun Nov 11, 2018 7:31 pm**

The attachment on the previous page with ZTOS.P is updated to do the startup as described in the previous post, and I think it is indeed solved

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