Search found 942 matches

by siggi
Sat Sep 18, 2021 4:45 pm
Forum: Hardware
Topic: 32k Internal ram with m/c above 32k
Replies: 14
Views: 1218

Re: 32k Internal ram with m/c above 32k

I don't think, that there is any usual BASIC program > 16K. I needed to disable m/c above 32K, when I once compiled CHOPPERDROP3000, using MCODER II. The Basic source was < 16K, but during compiler run, the generated code was inserted into program line 2 (or 1?), which increased the size of the prog...
by siggi
Fri Sep 17, 2021 10:43 pm
Forum: Hardware
Topic: 32k Internal ram with m/c above 32k
Replies: 14
Views: 1218

Re: 32k Internal ram with m/c above 32k

if you fit the m1not circuit, you dont need to 'deactivate' it if you have basic over 32768, it 'should' make no difference If a BASIC program is bigger than 16K, the D-file is located above 32K (above the BASIC program). It an M1!-circuit is active, the D-file is executed as code (during dispaly) ...
by siggi
Thu Aug 05, 2021 8:56 am
Forum: Software
Topic: Memory check utility
Replies: 5
Views: 4030

Re: Memory check utility

Olli did not publish the source.
by siggi
Tue Aug 03, 2021 9:06 am
Forum: Software
Topic: Memory check utility
Replies: 5
Views: 4030

Re: Memory check utility

Olli also wrote a SYSINFO program to check for ram/rom, M1!-circuit (M/C above 32K) and ethernet chip:

https://forum.tlienhard.com/phpBB3/view ... 6150#p6150

Siggi
by siggi
Sat Jul 24, 2021 10:00 pm
Forum: Development
Topic: ZX81 Nuclear Power Station Software
Replies: 12
Views: 1587

Re: ZX81 Nuclear Power Station Software

I once wrote a similar game. See viewtopic.php?p=37108#p37108
:mrgreen:
Siggi
by siggi
Mon May 31, 2021 9:54 am
Forum: Hardware
Topic: Alphacom 32 PSU?
Replies: 16
Views: 1530

Re: Alphacom 32 PSU?

Moggy wrote: Mon May 31, 2021 12:08 am Same plug size as zeddy power pack and obviously corresponding socket.
No, Zeddy uses 3,5 mm plugs, the printer 2,5 mm plugs.
by siggi
Mon May 31, 2021 9:49 am
Forum: Hardware
Topic: Alphacom 32 PSU?
Replies: 16
Views: 1530

Re: Alphacom 32 PSU?

A typical voltage resistance of capacitors (inside the printer) is 35V. This value fits to a rectivied AC voltage of 24V, but not to more (the capacitor may explode).

Siggi
by siggi
Mon May 31, 2021 9:43 am
Forum: ZX BASIC
Topic: Writing data files
Replies: 6
Views: 902

Re: Writing data files

One hint: if you use SAVE within a running BASIC program (to continue the program there after LOAD), the SAVE command may be used only in the main program, not located a sub-routine!!! The reason is, that the RETURN address of the sub-routine is stored on the BASIC stack, which is NOT saved by the S...
by siggi
Sun May 30, 2021 12:08 am
Forum: Hardware
Topic: ‘Tatung 81’ (ZX81 in a case)
Replies: 26
Views: 2419

Re: ‘Tatung 81’ (ZX81 in a case)

Hope fully it will glue ok. The inside got a bashing as well. There are two power sockets: E22CFC8A-8E7E-4D76-B4F4-9B4898BC9AA6.jpeg As far as I can tell they appear to be joined together so I only need to use one? FE321723-AA59-4BA2-9BA6-EE7B3B14EEE1.jpeg If that is true, power fed to one of the s...
by siggi
Thu May 27, 2021 10:41 am
Forum: ZX BASIC
Topic: Why "C"?
Replies: 4
Views: 784

Re: Why "C"?

First check the meaning of the error message C!

If no key is pressed, INKEY$ gives an empty string "", which is NOT a numerical value.

HTH Siggi