Search found 558 matches

by tcat
Fri Aug 16, 2019 8:40 am
Forum: Hardware
Topic: MAB 8049H P A038 comapible?
Replies: 10
Views: 1296

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: 140
Views: 16755

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: DIY Fpu Unit for STFM
Replies: 28
Views: 4273

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: DIY Fpu Unit for STFM
Replies: 28
Views: 4273

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: DIY Fpu Unit for STFM
Replies: 28
Views: 4273

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: 567

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: 13
Views: 1237

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: 9109

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 's',72,20,7 ;string dc.b 'Compass rose',10,10 dc.b 'bearings ...
by tcat
Mon Jul 15, 2019 11:21 am
Forum: Software & Programming
Topic: SCREEN1 = SYSVAR @ JSROM
Replies: 83
Views: 9109

Re: SCREEN1 = SYSVAR @ JSROM

Hi, I am thinking of some simple graphics format. I have started with the one below, making use of the simple raster ops, I have coded so far. With a certain level of detail however, the data may become increasingly big. Then perhaps some RLE encoded bitmap image would be taking less space? Seeking ...
by tcat
Thu Jul 11, 2019 1:09 pm
Forum: Software & Programming
Topic: SCREEN1 = SYSVAR @ JSROM
Replies: 83
Views: 9109

Re: SCREEN1 = SYSVAR @ JSROM

Hi Jan, However, the X/Y pixel ratio in MODE 4 is 2:1 I believe it is mode 8, that has wider pixels across. As I count 0,1,2..256 pixels in mode 8, I unified the code, using now ellipse for circles as well. For mode 8, I just halve the ellipse width (a - excentricity). Actually, now thinking more ge...