Search found 155 matches

by Bill H
Thu Feb 27, 2020 3:13 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2207

Re: A new ZX81 Emulator

Ok so I have the keyboard working great as long as I wait for a key on the Adam. I am not sure what col / row I should return if no key is pressed. I see it starts out with H = FFh and L = FFh and I tried to return that is there is no key press but the ZX81 doesn't like it. Any tips on this? Edit: I...
by Bill H
Tue Feb 25, 2020 11:40 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2207

Re: A new ZX81 Emulator

Problems you might get 1) ROM-bug. Can you protect #0000-#1FFF against writing? If not, first addresses will be overwritten. 2) Reading IN-port (result can be different from machine you run or ZX81. Can be fixed with a scan and RST. 3) My games with "hidden" data on screen, can be emulated with cor...
by Bill H
Tue Feb 25, 2020 7:50 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2207

Re: A new ZX81 Emulator

Thanks again - I see it is storing it in LAST_K but I do not have any change on the screen so I have to dig a little deeper. This is what the system variables look like:
system variables.PNG
by Bill H
Tue Feb 25, 2020 1:21 pm
Forum: Hardware
Topic: Gladstone Organic Micro System
Replies: 1
Views: 1372

Gladstone Organic Micro System

I recently got this in an ebay auction. It includes:

Persona A interface
MiniMap
DROM
Pericon C interface
and 2 64k Modules. I havent plugged it in yet. I am including a copy of the manual that came with it and the catalog that I scanned.
by Bill H
Tue Feb 25, 2020 1:12 pm
Forum: Emulators
Topic: A new ZX81 Emulator
Replies: 9
Views: 2207

A new ZX81 Emulator

Hello All, I am currently working on a ZX81 emulator with a twist. This one runs in on a Coleco Adam. I have a good chunk of it working, I get it up to the 'K" prompt but I am stuck with keyboard input. Since the Adam is a Z80 system with free RAM in the right area I am able to load the ZXROM at 0h,...
by Bill H
Tue Jul 03, 2018 4:08 pm
Forum: SALES
Topic: eBay Listing - ZX81
Replies: 1
Views: 1644

eBay Listing - ZX81

HI Guys - I hope this is ok to list here:

https://www.ebay.com/itm/223042047544?ul_noapp=true

Bill
by Bill H
Sun Apr 15, 2018 1:37 pm
Forum: WANTED
Topic: Looking for a printer
Replies: 5
Views: 4129

Looking for a printer

Looking for a working printer with a roll of paper for the ZX81 to complete my setup. Prefer a ZX81 branded one if possible - anyone have an extra for sale?

Bill H
by Bill H
Thu Apr 12, 2018 1:23 pm
Forum: Hardware
Topic: TZXduino
Replies: 2
Views: 1228

Re: TZXduino

Oh - I havent tried it yet, its brand new - got it from the person making them on eBay - has the latest firmware. Ok so I need to give it a go and see what happens.

Bill H
by Bill H
Thu Apr 12, 2018 1:35 am
Forum: Hardware
Topic: TZXduino
Replies: 2
Views: 1228

TZXduino

I received this last week and have yet to try it because I thought it used . P files but it doesn't so now I need a way to convert from . P to TZX :(

Bill H
by Bill H
Fri Apr 06, 2018 11:31 pm
Forum: Hardware
Topic: T/S1000 Turbo Switch
Replies: 5
Views: 1777

Re: T/S1000 Turbo Switch

Back in 2005 I did some testing on various ways of speeding up the TS1000: The program that I used for benchmarking the ZX81, TS1000, TS1500 and ZX81 emulator grew out of a conversation on the board about speeding up Sinclair Basic: 5 LET A=40 10 LET S=PEEK 16436+256*PEEK 16437 20 FOR K=1 TO 1000 40...