Search found 550 matches

by tcat
Sat Aug 17, 2019 5:14 pm
Forum: QL Emulation
Topic: uQLx 2018a
Replies: 25
Views: 3709

Re: uQLx 2018a

Hi, Still thinking about zoom>1, this is when the emulator window does not get updated properly. On my further looking into, with zero X-Windows knowledge, this is what I see happening. In `xql.c', `x.c' there is XposeEvent, looks like an event loop, from within `redraw-screen()' is called. In `redr...
by tcat
Fri Aug 16, 2019 12:42 pm
Forum: Hardware
Topic: 74HCxx vs 74LSxx
Replies: 12
Views: 1865

Re: 74HCxx vs 74LSxx

Hi, Just spotted the application note `AN947', pointed a few posts above, is missing appendices B,C. Anyone having the full document? EDIT The document I have is `AN947_REV0.PDF', I guess REV0 stands for revision 0. It just happens to miss some pages at the end, containing appendices B,C. It is Moto...
by tcat
Fri Aug 16, 2019 8:40 am
Forum: Hardware
Topic: MAB 8049H P A038 comapible?
Replies: 9
Views: 596

Re: MAB 8049H P A038 comapible?

Hi, I have thought, Intel's 8048, 8049 are single chip microcontrollers, having program and data memory. And can be user programmed simillarly as more modern PIC micros. I believed program resides in internal EPROM. As that what HERMES is all about, is just a new firmware for IPC (8049)? Apologies, ...
by tcat
Tue Aug 13, 2019 5:30 pm
Forum: Hardware
Topic: Issue 8 discussions...
Replies: 123
Views: 10599

Re: Issue 8 discussions...

Hi,

Rereading the topic now and again. I wish to ask, what makes it different to hook 8302 on CPU data bus as with Iss#6 vs RAM bus in Iss#5, is there any performance gain?

Many thanks
Tomas
by tcat
Tue Aug 13, 2019 12:32 pm
Forum: Hardware
Topic: 74HCxx vs 74LSxx
Replies: 12
Views: 1865

Re: 74HCxx vs 74LSxx

Hi Nasta, Thank you for explaining, re `power decoupling and grounding', I tried to put a capacitor close to VCC of each chip. Power comes through P2 connector, which should connect to common +5V rail inside ST machine (have no idea yet where best to source, seeking advice), connector P1 should inte...
by tcat
Tue Aug 13, 2019 8:38 am
Forum: Hardware
Topic: 74HCxx vs 74LSxx
Replies: 12
Views: 1865

Re: 74HCxx vs 74LSxx

Hi Derek,

Ah, `plating rivets', then. Looked for them on the net, they sell in a thousand pack, I have counted I just need 33 holes to plate through, standard 0.8mm drill, these are on the PCB front. The rest of PLCC68 holes are routed on the rear, no plating needed.

Thank you
Tomas
by tcat
Mon Aug 12, 2019 10:02 am
Forum: Hardware
Topic: 74HCxx vs 74LSxx
Replies: 12
Views: 1865

Re: 74HCxx vs 74LSxx

Hi, An old topic, I know. I've had some time and designed a PCB prototype based on the schematics above. As I have no SMD skills, I just stick to standard TTL in DIP sockets. Exception being PLCC68 for the FPU. I tried to make the board as small as possible, and this is best I can do at the moment. ...
by tcat
Wed Jul 31, 2019 10:13 am
Forum: Software & Programming
Topic: ALCHP and LOAD problem
Replies: 5
Views: 329

Re: ALCHP and LOAD problem

Hi Martin,

To retain basic variables, I use MERGE in lieu of LOAD as I test various M/C against different basic test units.

Code: Select all

DLINE TO: REMark deletes old prog, but vars
MERGE prog_bas: REMark loads new prog
CLEAR: REMark optional smashes var area

Tomas
by tcat
Mon Jul 29, 2019 11:37 am
Forum: Software & Programming
Topic: Looking for Metacomco Languages
Replies: 9
Views: 582

Re: Looking for Metacomco Languages

Hi,

Not sure if of any help, I tried to find out about a possible ROM to RAM toolkit conversion here in the subject.
viewtopic.php?f=3&t=1499&hilit=ROM+to+RAM+toolkit+conversion#p12682

You still however need ROM image of respective MetaComco dongles.
Tomas
by tcat
Tue Jul 16, 2019 7:43 pm
Forum: Software & Programming
Topic: SCREEN1 = SYSVAR @ JSROM
Replies: 83
Views: 6664

Re: SCREEN1 = SYSVAR @ JSROM

Hi, Testing the graphics interpreter, can now process all elements by definition, including new lines in strings, glad I have learnt how to add. I know, is not exactly a stunning hi-res image, but is best, I can do at the moment. ... dc.b 'Compass rose',10,10 dc.b 'bearings to North',10 dc.b 'bearin...